Magnetostriction Constants from Ferromagnetic Resonance

Abstract

The saturation magnetostrictive constants of a magnetic material may be determined by means of ordinary ferromagnetic resonance. For small strains, the magnetic field required for resonance at a given frequency is a linear function of the applied uniaxial stress. The magnitude of this shift may be directly related to the magnetostrictive constants of the substance under investigation. The constants for YIG, YIG doped with Er3+, YIG doped with Yb3+, nickel ferrite, and nickel ferrite doped with cobalt have been measured by this new technique in a temperature range from 77° to 350°K. Where comparisons are possible, the results agree quite well with previous measurements. In particular, the measured magnetostrictive constants of YIG are in good agreement with values that have been obtained from magnetoacoustic and strain gauge experiments.