Accession Number:

AD0643600

Title:

FERROACOUSTIC RESONANCE IN MAGNETIC MEDIA.

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1966-12-07

Pagination or Media Count:

19.0

Abstract:

Ferroacoustic resonance in ferromagnets and antiferromagnets is studied with an allowance for the boundary. The resonance amplitudes were determined from magnetic spin waves excited by an extermal acoustic field. The coefficients of absorption of magnetoacoustic vibrations at resonance were also determined. The excitment of magnetic spin waves by an external acoustic field at the boundary is considered and the general boundary conditions depending on the exchange forces, the surface-anisotropy field and surface magnetestriction were determined. It is shown that in antiferromagnets where magnetic moments are at an angle with respect to a strong magnetic field H, the magnetic moments of the sublattices gradually collapse near the boundary. In this case the distortion depth of the magnetic structure is equal to a multiple of the lattice constant. In the approximation of weak surface antsotropy the resonance amplitudes of spin waves excited by an external acoustic field and the absorption coefficients of coupled vibrations at resonance are determined. Author

Subject Categories:

  • Acoustics
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE