Coplanar waveguide ferromagnetic resonance measurement system and method

A coplanar waveguide and ferromagnetic resonance technology, applied in the microwave field, can solve the problems of high 9GHz frequency, high test cost, and inability to realize sweep frequency test.

Pending Publication Date: 2021-05-18
NANJING UNIV
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Problems solved by technology

The resonant frequency of the resonant cavity is determined by the size at the time of production, generally around 9GHz, which not only cannot achieve flexible frequency sweep testing, but also has a relatively high frequency of 9GHz, which may require a large mag

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  • Coplanar waveguide ferromagnetic resonance measurement system and method
  • Coplanar waveguide ferromagnetic resonance measurement system and method
  • Coplanar waveguide ferromagnetic resonance measurement system and method

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Embodiment Construction

[0037] The present invention will be further described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0038] An embodiment of the present invention is a coplanar waveguide ferromagnetic resonance measurement system, the system composition is as follows figure 1 As shown, the hardware of the coplanar waveguide ferromagnetic resonance measurement system includes a coplanar waveguide, an electromagnet, a microwave signal generator, a wave detector, a nanovoltmeter, a current source, and a computer.

[0039] The coplanar waveguide is used to place the electromagnetic film material to be tested, and the coplanar waveguide is placed in the magnetic field formed by two electromagnets. The two electromagnets are respectively connected to the positive and negative poles of the current source, and a uniform magnetic field is generated under the excitation of the current source, and the magnitude of the magnetic field and the magnit...

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Abstract

The invention discloses a coplanar waveguide ferromagnetic resonance measurement system and method, and belongs to the technical field of microwave systems. The system comprises a coplanar waveguide, electromagnets, a microwave signal generator, a detector, a nanovoltmeter, a current source and a computer. An electromagnetic film material is placed on the coplanar waveguide. The coplanar waveguide is placed in a magnetic field formed by the two electromagnets, one end is connected with the microwave signal generator, and the other end is connected with the detector. The electromagnets are connected with the positive and negative electrodes of the current source and generate a uniform magnetic field under excitation of the current source. The microwave signal generator generates a high-frequency alternating current signal, and the detector converts the intensity of a microwave signal generated after the high-frequency alternating current signal passes through the coplanar waveguide into a voltage signal. The nanovoltmeter detects and records the converted voltage signal and outputs the converted voltage signal to the computer. The computer controls operation of the microwave signal generator, the nanovoltmeter and the current source and receives and records measurement result data. According to the invention, frequency sweep and field sweep measurement of ferromagnetic resonance can be realized at low cost.

Description

technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to a coplanar waveguide ferromagnetic resonance measurement system and method. Background technique [0002] Ferromagnetic resonance (FMR) is an experimental method used to study the microstructure and macroscopic properties of substances, which began in the 1940s. By utilizing the phenomenon of magnetic materials absorbing energy in a microwave magnetic field, many aspects of materials can be studied. Ferromagnetic resonance plays an important role in the study of solid state physics and magnetism. [0003] In spintronics and high-frequency magnetism, the ferromagnetic resonance of electromagnetic thin film materials has important applications, such as the read head of the magnetic disk, MRAM, spin torque oscillator and so on. When the static magnetic field received by the magnetic film matches the microwave magnetic field, the film strongly absorbs microwaves. By ...

Claims

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Application Information

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IPC IPC(8): G01R33/12
CPCG01R33/12
Inventor 唐东明黄乔李威张旭阳张豹山杨燚
Owner NANJING UNIV
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