SPIN WAVE INSTABILITIES AND RELAXATIONS IN FERROMAGNETIC METALS.

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.

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1965
Accession Number
AD0623164

Entities

People

  • James B. Comly

Organizations

  • Harvard University

Tags

DTIC Thesaurus Topics

  • Alloys
  • Electron Paramagnetic Resonance
  • Electrons
  • Instability
  • Iron
  • Iron Alloys
  • Magnetic Phenomena
  • Magnetic Properties
  • Magnetic Resonance
  • Measurement
  • Metals
  • Microwaves
  • Modulation
  • Paramagnetic Resonance
  • Resonance
  • Spin Waves

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Materials Science and Engineering.
  • Superconducting Magnet Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene