Magnetic calorimetric device and detection system

Abstract

The invention relates to the technical field of calorimetry, and provides a magnetic calorimetry device and a detection system, and the magnetic calorimetry device comprises a magnetic calorimetry chip, an absorber, a paramagnet, a circuit board and a heat sink circuit. The magnetic calorimetric chip comprises a first hot bath; the absorber is used for absorbing the low-energy particles and converting energy of the low-energy particles into heat energy; the paramagnet is connected with the absorber and used for converting heat energy into magnetic flux. The circuit board comprises a second hot bath, and the magnetic calorimetric chip is arranged in the second hot bath; and the heat sink circuit is sequentially connected with the paramagnet, the first hot bath and the second hot bath. According to the magnetic calorimetric device provided by the embodiment of the invention, the relaxation time of the magnetic flux signal can be shortened, and the accuracy of the magnetic calorimetric device is improved.

Description

Technical Field

[0001] The present application relates to the field of calorimetry technology, and in particular to a magnetocalorimetric device and a detection system. Background Art

[0002] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] The Metallic Magnetic Calorimeter (MMC) is a low-temperature particle detector based on calorimetry. It usually includes a magnetocalorimeter chip, a paramagnet, and a pickup coil. The energy of the low-energy particles of the radioactive source is converted into heat energy, causing the magnetic susceptibility of the paramagnet to change. Due to the presence of superconducting current in the pickup coil, the change in magnetic susceptibility is converted into a magnetic flux signal, which is then obtained through the magnetocaloric chip.

[0004] In the related art, the relaxation time of the magnetic flux signal is long, which causes a decrease in the theoretical counting rate and pulse signal stacking, resulting in low accuracy of the magnetocalorimeter. Summary of the invention

[0005] In view of this, the embodiments of the present application hope to provide a magnetocalorimetric device and a detection system, which can shorten the relaxation time of the magnetic flux signal and improve the accuracy of the magnetocalorimetric device.

[0006] A first aspect of an embodiment of the present application provides a magnetocalorimetric device for detecting low-energy particles, comprising:

[0007] A magnetocaloric chip including a first heat bath;

[0008] An absorber, for absorbing low-energy particles and converting the energy of the low-energy particles into heat energy;

[0009] a paramagnet, connected to the absorber, for converting thermal energy into magnetic flux;

[0010] The circuit board comprises a second heat bath, wherein the magnetocaloric chip is disposed in the second heat bath;

[0011] A heat sink circuit sequentially connects the paramagnet, the first heat bath, and the second heat bath.

[0012] In some embodiments, the heat sink circuit includes a heat conductive belt and a plurality of heat conductive wires, the heat conductive belt connects the first heat bath and the paramagnet, and the plurality of heat conductive wires connects the first heat bath and the second heat bath.

[0013] In some embodiments, the thermal conductive tape and the thermal conductive wire are made of the same material.

[0014] In some embodiments, the magnetocaloric device includes a plurality of heat-conducting columns, and the absorber and the paramagnet are respectively connected to opposite ends of the heat-conducting columns.

[0015] In some embodiments, the plurality of thermally conductive pillars are arranged in a matrix.

[0016] In some embodiments, the height of the thermally conductive pillar is between 5 μm and 20 μm.

[0017] In some embodiments, the magnetocaloric device comprises a pickup coil connected to a side of the paramagnetic body away from the absorber.

[0018] In some embodiments, the magnetocaloric device includes a base plate, wherein the base plate is sandwiched between the pickup coil and the magnetocaloric chip.

[0019] In some embodiments, a plane perpendicular to the thickness direction of the magnetocalorific chip is used as a projection plane, and the projection range of the magnetocalorific chip is located within the projection range of the second heat bath.

[0020] In some embodiments, the absorber is located on one side of the paramagnet along the first direction, and a plane perpendicular to the first direction is taken as a projection plane, and a projection range of the paramagnet is located within the projection range of the absorber.

[0021] In some embodiments, the absorber has a thickness between 5 μm and 30 μm.

[0022] In some embodiments, the thickness of the paramagnet is between 1.3 μm and 2 μm.

[0023] A second aspect of an embodiment of the present application provides a detection system, including:

[0024] processor;

[0025] Low temperature platform;

[0026] The magnetocalorimetric device described in any of the above items is arranged on the low-temperature platform and is electrically connected to the processor.

[0027] In the magnetocalorimetric device provided in the embodiment of the present application, the absorber generates heat energy and transfers it to the paramagnet, which is then transferred to the first heat bath and the second heat bath in sequence through the heat sink circuit. Compared with the related art, in the present application, the temperature of the first heat bath and the second heat bath are constant and the heat capacity is large, and the heat energy is then transferred through a thermal resistance circuit with a constant temperature. The heat energy can be quickly transferred to the two heat baths in sequence, thereby shortening the relaxation time of the magnetic flux signal, achieving relatively high counts and high-resolution detection of low-energy particles, and improving the accuracy of the magnetocalorimetric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1A schematic diagram of the structure of a magnetocaloric device provided in some embodiments of the present application;

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 A schematic diagram of the structure of the absorber, the heat-conducting column, the paramagnetic body and the pickup coil assembly provided in some embodiments of the present application;

[0031] Figure 4 A schematic diagram of a plurality of heat-conducting pillars arranged in a matrix provided in some embodiments of the present application;

[0032] Figure 5 A schematic diagram of the structure of the assembly of a paramagnet and a base plate provided in some embodiments of the present application.

[0033] Description of Reference Numerals

[0034] Magneto-calorimetric device 100;

[0035] Magnetocalorimetry chip 10; first heat bath 11;

[0036] Absorber 20;

[0037] Paramagnet 30;

[0038] Second hot bath 40;

[0039] Heat sink circuit 50; heat conducting belt 51; heat conducting wire 52;

[0040] Thermally conductive column 60;

[0041] Pickup coil 70;

[0042] Base plate 80. DETAILED DESCRIPTION

[0043] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0044] The various specific technical features and embodiments described in the specific implementation methods can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in this application are no longer described separately. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] In the related art, the magnetocalorimetric device includes an absorber and a circuit board. The absorber is used to convert the energy of low-energy particles into thermal energy. The magnetocalorimetric chip and the circuit board are connected by glue. The magnetocalorimetric chip and the circuit board are made of different materials and have a certain thermal resistance. The thermal conductivity of the glue layer used to connect the two is poor, resulting in a long relaxation time of the magnetic flux signal, which affects the accuracy of the magnetocalorimetric device.

[0046] See also Figures 1 to 5 The embodiment of the present application provides a magnetocaloric device 100 for detecting low-energy particles, including a magnetocaloric chip 10, an absorber 20, a paramagnet 30, a circuit board and a heat sink circuit 50. The magnetocaloric chip 10 includes a first heat bath 11; the absorber 20 is used to absorb low-energy particles and convert the energy of the low-energy particles into heat energy; the paramagnet 30 is connected to the absorber 20 and is used to convert the heat energy into magnetic flux; the circuit board includes a second heat bath 40, and the magnetocaloric chip 10 is arranged in the second heat bath 40; the heat sink circuit 50 sequentially connects the paramagnet 30, the first heat bath 11 and the second heat bath 40.

[0047] The paramagnet 30 is connected to the absorber 20. Specifically, the paramagnet 30 is connected to the absorber 20 by heat transfer, and the heat transfer connection refers to that the two structural parts are directly in contact or indirectly connected through a heat conductive structure so that heat conduction can be carried out between the two structural parts. In other words, after the energy of the low-energy particles is converted into thermal energy by the absorber 20, the thermal energy can be transferred to the paramagnet 30, and the change in thermal energy can cause the magnetic susceptibility of the paramagnet 30 to change, thereby generating a magnetic flux signal. The magnetocaloric chip 10 is used to obtain a magnetic flux signal.

[0048] The specific material of the absorber 20 is not limited, and illustratively, it may be gold, silicon, rhenium, semiconductor material or superconductor material, etc.

[0049] The specific material of the paramagnet 30 is not limited. For example, it can be erbium of different PPM (Parts Per Billion) levels.

[0050] The magnetocaloric chip 10 is disposed in the second heat bath 40, that is, the second heat bath 40 connects the magnetocaloric chip 10 and the circuit board. On the one hand, the second heat bath 40 can enhance the connection stability between the magnetocaloric chip 10 and the circuit board, and on the other hand, a small amount of heat energy can be directly transferred to the second heat bath 40 via the magnetocaloric chip 10, which is beneficial to heat energy transfer.

[0051] The specific type of the circuit board is not limited, and for example, it may be a printed circuit board (PCB).

[0052] The first heat bath 11 and the second heat bath 40 are nearly constant temperature structural parts with large heat capacity and good thermal conductivity, that is, the temperatures of the first heat bath 11 and the second heat bath 40 are substantially constant. In this way, the thermal resistance between the first heat bath 11 and the second heat bath 40 is small, and heat energy can be transferred relatively smoothly. Exemplarily, the first heat bath 11 and the second heat bath 40 are made of the same material.

[0053] The heat sink circuit 50 can be used to transfer heat energy. The heat sink circuit 50 refers to a heat-conducting structure whose temperature does not change with the change of the transferred heat energy. In other words, the temperature of the heat sink circuit 50 is almost constant, and the heat energy can be transferred relatively smoothly.

[0054] The heat sink circuit 50 is connected to the paramagnet 30, the first heat bath 11 and the second heat bath 40 in heat transfer connection in sequence. That is to say, the heat energy transferred to the paramagnet 30 can be transferred to the first heat bath 11 and the second heat bath 40 via the heat sink circuit 50. In this way, the temperatures of the heat sink circuit 50, the first heat bath 11 and the second heat bath 40 are constant, which is beneficial to the heat energy transfer. In this way, compared with the large thermal resistance and poor thermal conductivity in the related art, the temperature of the first heat bath 11 and the second heat bath 40 in the present application is constant and the heat capacity is large. Then, the heat energy is transferred through the thermal resistance circuit with constant temperature. The heat energy can be quickly transferred to the two heat baths in sequence, thereby shortening the relaxation time of the magnetic flux signal, achieving relatively high counts and high-resolution detection of low-energy particles, and improving the accuracy of the magnetocalorimetric device 100.

[0055] In the magnetocalorimetric device 100 provided in the embodiment of the present application, the absorber 20 generates heat energy and transfers it to the paramagnet 30, which is then transferred to the first heat bath 11 and the second heat bath 40 in sequence through the heat sink circuit 50. Compared with the related art, in the present application, the temperature of the first heat bath 11 and the second heat bath 40 are constant and the heat capacity is large. The heat energy is then transferred through a thermal resistance circuit with a constant temperature. The heat energy can be quickly transferred to the two heat baths in sequence, thereby shortening the relaxation time of the magnetic flux signal, achieving relatively high counts and high-resolution detection of low-energy particles, and improving the accuracy of the magnetocalorimetric device 100.

[0056] In one embodiment, the heat capacity of the first heat bath 11 is smaller than the heat capacity of the second heat bath 40. Thus, the volume of the first heat bath 11 is relatively small, which is convenient for being arranged on the magnetocalorimetric chip 10, and reducing the difficulty of production and assembly.

[0057] In one embodiment, the absorber 20 and the paramagnet 30 are substantially in the shape of a hexahedron, so that it is easy to assemble the absorber 20 and the paramagnet 30 , and to couple the paramagnet 30 with the pickup coil 70 .

[0058] In one embodiment, the second heat bath 40 is connected to the circuit board by adhesive. Exemplarily, the second heat bath 40 and the circuit board are adhered to the circuit board by GE7031 low-temperature adhesive, which is firmly adhered and has good stability.

[0059] The embodiment of the present application also provides a detection system, including a processor, a low temperature platform and the magnetocalorimetry device 100 in any embodiment of the present application, wherein the magnetocalorimetry device 100 is disposed on the low temperature platform and electrically connected to the processor. The low temperature platform is used to cool the components such as the magnetocalorimetry device 100 to enable them to operate normally, that is, the low temperature platform can be regarded as a heat sink structure. The magnetocalorimetry chip 10 detects the magnetic flux signal and transmits it to the processor, which is used to process and read the magnetic flux signal.

[0060] Exemplarily, the magnetocalorimetric device 100 is fixed on a low-temperature platform, and a conductive wire group arranged on the low-temperature platform electrically connects the magnetocalorimetric chip 10 and the processor. The low-temperature platform can cool the conductive wire group. In this way, the temperature of the conductive wire group is almost constant, thereby reducing the energy that can be transmitted to the magnetocalorimetric chip 10 through the conductive wire group, thereby improving the accuracy of the magnetocalorimetric device 100.

[0061] Further, the magnetocaloric device 100 is cooled to 4K (Kelvin), i.e. -269.15°C (degrees Celsius), through a low temperature platform, and a superconducting current is introduced. The magnetocaloric device 100 is further cooled to an operating temperature, for example, 20mK to 30mK, i.e. -273.13°C to -273.12°C, and the magnetocaloric chip 10 is flux locked through a processor to obtain a noise curve. If the amplitude of the noise curve is less than a preset value, it indicates that the shielding performance of the magnetocaloric device 100 meets the requirements, and an accurate flux signal is obtained, wherein the preset value is 3mV (millivolt, 1mV=10 -3 V).

[0062] For some examples, see Figure 1 and Figure 2 The heat sink circuit 50 includes a heat conducting belt 51 and a plurality of heat conducting wires 52. The heat conducting belt 51 connects the first heat bath 11 and the paramagnet 30, and the plurality of heat conducting wires 52 connects the first heat bath 11 and the second heat bath 40. The heat conducting belt 51 and the heat conducting wires 52 can increase the transfer speed of heat energy.

[0063] Specifically, the heat-conducting belt 51 is heat-conductingly connected to the first heat bath 11 and the paramagnet 30, and the heat-conducting wire 52 is heat-conductingly connected to the first heat bath 11 and the second heat bath 40. In other words, heat energy can be transferred from the paramagnet 30 to the first heat bath 11 via the heat-conducting belt 51, and then transferred from the first heat bath 11 to the second heat bath 40 via the plurality of heat-conducting wires 52. In this way, heat energy can be transferred to the first heat bath 11 and the second heat bath 40 in sequence relatively smoothly, thereby reducing the relaxation time of the magnetic flux signal and improving the accuracy of the magnetocalorimetric device 100.

[0064] It should be noted that, in the present application, a plurality refers to a quantity including two or more.

[0065] In some embodiments, the heat conducting belt 51 and the heat conducting wire 52 are made of the same material. In this way, the heat conducting belt 51 and the heat conducting wire 52 have the same thermal conductivity, and heat energy can be transferred through the heat conducting belt 51 and the heat conducting wire 52 more smoothly.

[0066] The specific materials of the heat-conducting belt 51 and the heat-conducting wire 52 are not limited. For example, the heat-conducting belt 51 and the heat-conducting wire 52 can be made of gold.

[0067] For some examples, see Figures 3 to 5 The magnetocaloric device 100 includes a plurality of heat-conducting columns 60 , and the absorber 20 and the paramagnetic body 30 are respectively connected to two opposite ends of the heat-conducting columns 60 .

[0068] Specifically, the heat-conducting column 60 connects the absorber 20 and the paramagnet 30 by heat transfer, and heat energy can be transferred from the absorber 20 to the paramagnet 30 via the heat-conducting column 60. The heat-conducting column 60 acts as a thermal bottleneck, so that the energy of low-energy particles can be basically thermalized in the absorber 20, and reduces the energy loss caused by the incompletely thermalized phonons being thermalized in the form of mechanical vibration outside the absorber 20. The heat-conducting column 60 can also enhance the connection stability between the absorber 20 and the paramagnet 30.

[0069] The specific material of the heat-conducting pillar 60 is not limited. For example, the heat-conducting pillar 60 can be made of gold.

[0070] In one embodiment, the heat-conducting column 60, the heat-conducting belt 51 and the heat-conducting wire 52 are made of the same material, so that the heat-conducting column 60, the heat-conducting belt 51 and the heat-conducting wire 52 have the same thermal conductivity, which can further improve the stability of heat energy transfer. Exemplarily, the heat-conducting column 60, the heat-conducting belt 51 and the heat-conducting wire 52 can all be gold.

[0071] For some examples, see Figure 4 , multiple heat-conducting columns 60 are arranged in a matrix. That is to say, the heat-conducting columns 60 are distributed in a certain order, the positions of the heat-conducting columns 60 are fixed and the arrangement is relatively regular. On the one hand, multiple heat-conducting columns 60 can further improve the speed and completeness of energy conversion into heat energy and reduce heat energy loss. On the other hand, the positions of all heat-conducting columns 60 are fixed, that is, the path for heat energy to be transferred from the absorber 20 to the paramagnet 30 is relatively fixed. In this way, the error caused by the transfer of heat energy to the paramagnet 30 via a random path when low-energy particles are randomly injected into the absorber 20 can be reduced or even eliminated, thereby improving the accuracy of the magnetocalorimetric device 100.

[0072] In some embodiments, the height of the heat-conducting pillar 60 is between 5 μm and 20 μm. In other words, the height direction of the heat-conducting pillar is along the first direction. For example, the height of the heat-conducting pillar 60 is 5 μm (micrometer, 1 μm = 10 -6 m), 10μm, 15μm or 20μm, etc.

[0073] For some examples, see Figure 2 and Figure 3 The magnetocalorimetric device 100 includes a pickup coil 70, which is connected to the side of the paramagnet 30 away from the absorber 20. The pickup coil 70 is used to generate a magnetic field by energizing. In this way, the entire paramagnet 30 is in the magnetic field generated by the pickup coil 70, thereby improving the sensing accuracy of the magnetic susceptibility of the paramagnet 30.

[0074] It should be noted that, under the cooling effect of the cryogenic platform, the pickup coil 70 is in a superconducting state, that is, the current injected into the pickup coil 70 will not dissipate, the current circulates in the pickup coil 70, and the magnetic flux of the magnetic field formed by the pickup coil 70 remains unchanged. In this way, the change in thermal energy causes the magnetic susceptibility of the paramagnet 30 to change, which in turn causes the magnetic flux of the magnetic field to change, and finally generates a magnetic flux signal.

[0075] The specific material of the pickup coil 70 is not limited. For example, the pickup coil 70 can be made of niobium. The temperature at which niobium is converted to a superconducting state is between 8K and 9K, that is, -265.15°C to -264.15°C. In this way, during the process of cooling the magnetocalorific device 100 on the low-temperature platform and when the magnetocalorific device 100 is in operation, the pickup coil 70 can be in a superconducting state with good stability.

[0076] For some examples, see Figure 5 The magnetocalorimetry device 100 includes a base plate 80, which is sandwiched between the pickup coil 70 and the magnetocalorimetry chip 10. That is, the base plate 80 separates the pickup coil 70 and the magnetocalorimetry chip 10, and the pickup coil 70 and the magnetocalorimetry chip 10 are not in contact, which can prevent the pickup coil 70 and the magnetocalorimetry chip 10 from touching and causing damage, and the base plate 80 plays a protective role. In addition, the surface of the base plate 80 is relatively flat, which can maintain the stability of the absorber 20 and the paramagnet 30.

[0077] The specific material of the base plate 80 is not limited. For example, the base plate 80 can be made of silicon to save costs.

[0078] For some examples, see Figure 2 , taking the plane perpendicular to the thickness direction of the magnetocaloric chip 10 as the projection plane, the projection range of the magnetocaloric chip 10 is located within the projection range of the second heat bath 40. In this way, on the one hand, the second heat bath 40 has a larger heat capacity and can absorb more heat energy, thereby improving the operation stability of the magnetocaloric device 100. On the other hand, a very small amount of heat energy can be directly transferred to the second heat bath 40 via the magnetocaloric chip 10, thereby preventing the heat energy from diffusing outward and reducing the heat energy loss. In addition, it is also convenient to assemble the magnetocaloric chip 10 and the second heat bath 40.

[0079] For some examples, see Figure 5 , the absorber 20 is located on one side of the paramagnet 30 along the first direction, and the projection range of the paramagnet 30 is located within the projection range of the absorber 20, taking the plane perpendicular to the first direction as the projection plane. That is to say, the thickness direction of the absorber 20 and the thickness direction of the paramagnet 30 are both along the first direction, the area of ​​the absorber 20 is larger than the area of ​​the paramagnet 30, and low-energy particles can be injected into the absorber 20 as much as possible, so that the low-energy particles can be fully thermalized by the absorber 20, and low-energy particles that are not thermalized by the absorber 20 can be prevented from being injected into the paramagnet 30, thereby improving the accuracy of the magnetocalorimetric device 100.

[0080] In some embodiments, the magnetocalorimeter 100 includes a radiation source that emits low-energy particles, and in the first direction, the radiation source is disposed on a side of the absorber 20 away from the paramagnet 30. In this way, the low-energy particles will not be blocked by the paramagnet 30 on their path, and the low-energy particles can be injected into the absorber 20 relatively smoothly.

[0081] In some embodiments, the thickness of the absorber 20 is between 5 μm and 30 μm. For example, the thickness of the absorber 20 is 5 μm, 10 μm, 15 μm, 20 μm, 25 μm or 30 μm.

[0082] In some embodiments, the thickness of the paramagnet 30 is between 1.3 μm and 2 μm. For example, the thickness of the paramagnet 30 is 1.3 μm, 1.4 μm, 1.6 μm, 1.8 μm or 2 μm.

[0083] In one embodiment, four heat-conducting columns 60 are arranged between the absorber 20 and the paramagnet 30, all of which are cylindrical, 5 μm high, and the radii of the two bottom surfaces of the heat-conducting columns 60 are both 20 μm. The absorber 20 and the paramagnet 30 are both hexahedral, wherein the size of the absorber 20 is 300 μm×300 μm×6 μm (length×width×thickness), and the size of the paramagnet 30 is 300 μm×300 μm×1.5 μm.

[0084] Furthermore, taking the radiation source as an iron radiation source (55Fe) as an example, wherein the energy of the low-energy particles of the iron radiation source is 5.9 keV (kilo-electron volts), the magnetocaloric device 100 with the above parameters is used to detect the iron radiation source. Compared with the related art, the relaxation time of the magnetic flux signal can be shortened by three times, that is, in this embodiment, the relaxation time of the magnetic flux signal is one quarter of that in the related art.

[0085] In the description of this specification, the description with reference to the terms "an embodiment", "some embodiments" and "exemplary" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0086] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction. The above description is only a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, this application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A magnetocalorimetric device, characterized in that: For detecting low-energy particles, including: A magnetocaloric chip including a first heat bath; An absorber, for absorbing low-energy particles and converting the energy of the low-energy particles into heat energy; a paramagnet, connected to the absorber, for converting thermal energy into magnetic flux; The circuit board comprises a second heat bath, wherein the magnetocaloric chip is disposed in the second heat bath; A heat sink circuit sequentially connects the paramagnet, the first heat bath, and the second heat bath.

2. The magnetocalorimeter according to claim 1, characterized in that: The heat sink circuit includes a heat-conducting belt and a plurality of heat-conducting wires, wherein the heat-conducting belt connects the first heat bath and the paramagnet, and the plurality of heat-conducting wires connects the first heat bath and the second heat bath.

3. The magnetocalorimeter according to claim 2, characterized in that: The thermal conductive belt and the thermal conductive wire are made of the same material.

4. The magnetocalorimeter according to claim 1, characterized in that: The magnetocaloric device comprises a plurality of heat-conducting columns, and the absorber and the paramagnet are respectively connected to two opposite ends of the heat-conducting columns.

5. The magnetocalorimeter according to claim 4, characterized in that: The plurality of heat-conducting columns are arranged in a matrix.

6. The magnetocalorimeter according to claim 4, characterized in that: The height of the heat-conducting pillar is between 5 μm and 20 μm.

7. The magnetocalorimeter according to claim 1, characterized in that: The magnetocalorimetric device comprises a pickup coil connected to a side of the paramagnetic body away from the absorber.

8. The magnetocalorimeter according to claim 7, characterized in that: The magnetocaloric device includes a base plate sandwiched between the pickup coil and the magnetocaloric chip.

9. The magnetocalorimeter according to any one of claims 1 to 8, characterized in that: Taking a plane perpendicular to the thickness direction of the magnetocalorific chip as a projection plane, the projection range of the magnetocalorific chip is located within the projection range of the second heat bath.

10. The magnetocalorimeter according to any one of claims 1 to 8, characterized in that: The absorber is located at one side of the paramagnet along the first direction, and a plane perpendicular to the first direction is taken as a projection plane, and the projection range of the paramagnet is located within the projection range of the absorber.

11. The magnetocalorimeter according to any one of claims 1 to 8, characterized in that: The absorber has a thickness between 5 μm and 30 μm.

12. The magnetocalorimeter according to any one of claims 1 to 8, characterized in that: The thickness of the paramagnet is between 1.3 μm and 2 μm.

13. A detection system, characterized in that: include: processor; Low temperature platform; The magnetocalorimetric device according to any one of claims 1 to 12, wherein the magnetocalorimetric device is disposed on the low-temperature platform and is electrically connected to the processor.

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