LADP-4 Microwave Ferromagnetic Resonance Apparatus

Experiments

1. Understand and master the functions and regulation methods of each microwave device.

2. Understand the measurement principle and experimental conditions of ferromagnetic resonance, and understand the general characteristics of ferromagnetic resonance by observing the phenomenon of ferromagnetic resonance.

3. Ferromagnetic resonance signals of YIG polycrystalline balls are observed by oscilloscope to determine the resonance magnetic field, and g factor and gyromagnetic ratio  of polycrystalline samples are calculated according to microwave frequency.

4. The digital galvanometer is used to measure the relation between resonant cavity output power and magnetic field, describe the resonance curve, and determine the resonance magnetic field . The resonance line width is determined according to the measurement curve, and the relaxation time of YIG polycrystalline sample is estimated.

5. The ferromagnetic resonance signal of YIG single crystal ball is observed by oscilloscope, and the single resonance signal is observed by phase shifter, so as to learn the method of determining resonant magnetic field by oscilloscope observation.

6. Learn how to measure waveguide wavelength  and resonant frequency  of resonant cavity by short-circuit piston.

7. The relation between oriented resonance magnetic field of YIG single crystal sample and  is measured, and the size of resonance magnetic field of easy magnetization axis  and hard magnetization axis  is determined. The anisotropy constant  and  factor are calculated.