Freie und erzwungene Schwingungen der Magnetisierung in dünnen Permalloy-Schichten

Abstract

Free oscillations of the magnetization ranging from 500 to 1100 mc/sec have been excited in thin permalloy films by a pulse field with a risetime less than 0·35 nsec, and observed with a sampling oscilloscope. The eigenfrequencies and the damping constants of these free oscillations are compared with the resonance frequencies and the damping constants of forced oscillations obtained in ferromagnetic resonance experiments. Perpendicular and parallel orientation of the magnetization with respect to the easy direction of the induced uniaxial anisotropy of the film are considered. The results show reasonable agreement with theoretical values gained from the Landau-Lifshitz equation. © 1960 Springer-Verlag.