DEVELOPMENT PROGRAM ON MAGNETOELASTIC WAVE AMPLIFIER

Abstract

A general theory of parametric excitation of spin waves by a traveling phonon in a ferromagnet is presented. The theory yields expressions for the minimum phonon intensity required for excitation of a pair of spin waves. For certain cases of practical interest the threshold expressions together with the conservation conditions for parametric amplification are used through a computer program to generate curves of the functional relation between pertinent variables. Experiments utilizing suitable transducers and ferrimagnetic material are described. These experiments extend observation of the basic phenomena to include phonon pumping by transverse waves. An amplifier device, of exploratory nature, was designed and tested. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1967
Accession Number
AD0663221

Entities

People

  • D. H. Lyons
  • H. Matthews

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Amplitude
  • Bandwidth
  • Computational Science
  • Computer Programs
  • Crystal Structure
  • Dispersion Relations
  • Electromagnetic Radiation
  • Films
  • Frequency
  • Magnetic Fields
  • Materials
  • Repetition Rate
  • Spin Waves
  • Thin Films
  • Transverse Waves
  • Waves

Fields of Study

  • Physics

Readers

  • Microwave Engineering.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Theoretical Analysis.