Low Frequency Ferromagnetic Resonance Spectrometer

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Abstract
During an investigation of the effects of anisotropy on the conditions for ferromagnetic resonance at low frequencies in gallium and aluminum substituted YIG, the need arose for a ferromagnetic resonance spectrometer which would operate from about 100 to 1000 Mc. This memorandum describes a marginal oscillator technique which has proved to be both rapid and accurate. The operation is analogous in many respects to the operation of marginal oscillators for nuclear magnetic resonance. The system is similarly characterized by simplicity of equipment, ease of linewidth calibration, and high sensitivity of detection. Linewidths measured from 250 to 1000 Mc on YIG‐Ga spheres and disks are given to illustrate the technique.

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