Ferromagnetic resonance measurement system and method of short-circuit microstrip line based on labview
A short-circuit microstrip line and ferromagnetic resonance technology, which is applied in the microwave field, can solve the problems of bulky test equipment and achieve the effect of simple magnetic field control
Active Publication Date: 2019-06-25
NANJING UNIV
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Therefore, the magnetic field in the traditional test method needs to be added to several thousand Oersteds, and the strong magnetic field is provided by the electromagnet, which makes the test device not only bulky but also the residual magnetism in the iron core should be considered to be removed, so as not to affect the next generation. one measurement
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[0015] The technical scheme of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0016] The measuring system of the present invention includes two parts of software and hardware. hardware parts such as figure 1 , including: a short-circuit microstrip line fixture 1, which is used to provide an alternating high-frequency magnetic field; a gauss meter 2, which is used for magnetic field detection; a solenoid 3, which generates a uniform and stable magnetic field in the central axis of its interior after passing a current. In the example, the total length of the solenoid 3 is 150mm, the outer diameter is 80mm, and the inner diameter is 40mm, and there is a square stage in the middle of the solenoid 3, which is convenient for the microstrip line to be placed in the solenoid 3 smoothly; at the same time, the solenoid A small hole is arranged on the top of 3, so that the Hall probe can be placed to measure the m...
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The invention discloses a LabView-based short circuit micro-strip line ferromagnetic resonance measuring system and method. The system comprises a short circuit micro-strip line clamp, a gauss meter, a solenoid, a vector network analyzer, a current source and a program control computer, wherein the program control computer is used for controlling the vector network analyzer to supply a single-frequency signal source to a short circuit micro-strip line and controlling the current source to output a stable current to the solenoid so as to generate a uniform stable magnetic field in the solenoid. On the basis of the change in the magnetic field magnitude of a magnetic film sample along the horizontal direction, a reflected microwave signal S11 parameter is detected by the program control computer, a relation curve graph of an S parameter and a magnetic field is made, and the relation curve graph is subjected to data processing, so that a resonance line width, a gyromagnetic ratio and a spectroscopic splitting factor of the magnetic film sample can be acquired. A higher measuring magnetic field needs not be added into the measuring system provided by the invention. The measuring method provided by the invention is suitable for measurement for wideband and microwave low-frequency stages and can realize the field sweep and sweep frequency measurement.
Description
technical field [0001] The invention belongs to the field of microwave technology, and relates to a microwave analysis device for magnetic thin film materials, in particular to a short-circuit microstrip line ferromagnetic resonance measurement system based on LabVIEW. Background technique [0002] Ferromagnetic resonance (FMR) is an important experimental method developed in the 1940s to study the macroscopic properties and microstructure of substances. It uses the phenomenon that magnetic substances strongly absorb energy from a microwave magnetic field, and occupies an important position in the research of magnetism and solid-state physics like nuclear magnetic resonance and paramagnetic resonance. [0003] The ferromagnetic resonance measurement of magnetic thin films has very important applications in high-frequency magnetism and spintronics, such as the read head of hard disk, MRAM, spin magnetic moment MRAM and spin torque oscillator, etc. Ferromagnetic resonance is ...
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IPC IPC(8): G01R33/60
CPCG01R33/60
Inventor 唐东明朱杰贾龙飞刘园杨燚张豹山王啸坤李歌朱逸韩海阳
Owner NANJING UNIV