Coplanar waveguide ferromagnetic resonance measurement system and method

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 ...

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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 magnetic field to measure the resonant position, which has certain defects.

There are also some test methods that can realize frequency sweep and field sweep tests, but rely on expensive instruments such as vector network analyzers, and the test cost is relatively high

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