Motion of the Magnetic Moment of Thin Magnetic Films in a hf Rotating Field

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Abstract
This paper is devoted to some spectral investigation of the signal induced by the magnetic‐moment motion of thin anisotropic Permalloy films. Film switching was carried out by a rotating field of frequency f=6 Mc/sec. The signal induced by magnetic‐moment motion was detected by a measuring coil. Three spectral signal regions may be marked out, depending on the magnitude of the constant and hf rotating fields in the film plane: rotation frequencies, subharmonic oscillations, and higher harmonics. Rotation‐frequency signal‐amplitude measurement settled three kinds of magnetic‐moment motion depending on the field magnitude: oscillating, partial, and full rotation. There is a continuous spectrum noise near the rotation frequency in the case of partial rotation. A physical model of this spectrum is discussed. Subharmonic oscillations with ¼, ½, ¾ frequency rotations were also detected. These oscillations arise in the presence of the constant field when the rotating field corresponds to partial rotation. In the experiments with rotating fields corresponding to full magnetic‐moment motion, amplitude harmonic relations are nearly with coherent rotation theory.

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