Accession Number : AD0623164

Title :   SPIN WAVE INSTABILITIES AND RELAXATIONS IN FERROMAGNETIC METALS.

Descriptive Note : Scientific rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS CRUFT LAB

Personal Author(s) : Comly,James B.

Report Date : AUG 1965

Pagination or Media Count : 224

Abstract : The first useful measurements of parallel-pumped instability (PPI) thresholds in metals were made on vacuum-deposited films and rolled foils of the nickel: iron alloy, permalloy, using a pulse-power modulation of the usual electron paramagnetic resonance field modulation signal recovery technique. It is shown that PPI signals can be observed in films thinner than microwave skin depth, and in polycrystalline foils many skin depths thick. Relaxation rates of spin waves are determined.

Descriptors :   (*FERROMAGNETIC MATERIALS, MAGNETIC PROPERTIES), (*PUMPING(ELECTRONICS), FERROMAGNETIC MATERIALS), RELAXATION TIME, STABILITY, METALS, MAGNETIC RESONANCE, MICROWAVE FREQUENCY, OSCILLATION, PARAMAGNETIC RESONANCE, EXCITATION, METAL FILMS

Distribution Statement : APPROVED FOR PUBLIC RELEASE