LONGITUDINAL SUSCEPTIBILITY OF POROUS, POLYCRYSTALLINE YIG AT MICROWAVE FREQUENCIES.

Abstract

A theory of the longitudinal susceptibility (response to an rf field applied parallel to the dc field) of magnetic materials with a nonuniform saturation magnetization is described. According to this theory, the imaginary part of the longitudinal susceptibility, considered as a function of dc magnetif field, should show an absorption peak whose height is proportional to the porosity, whereas the width is substantially independent of porosity and approximately given by 2 pi M, where M is the average saturation magnetization. The real part of the susceptibility is negative on the low field side, positive on the high field side, of the absorption peak. Measurements on porous, polycrystalline YIG at room temperature and X-band are reported. The data agree quite well with the theoretical predictions, provided that allowance is made for the damping of the spin waves that give rise to the longitudinal susceptibility. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 25, 1965
Accession Number
AD0482418

Entities

People

  • E. Schloemann
  • T. Kohane

Organizations

  • RTX

Tags

DTIC Thesaurus Topics

  • Absorbers (Materials)
  • Absorption
  • Advanced Materials
  • Engineered Materials
  • Frequency
  • Frequency Bands
  • Magnetic Materials
  • Magnetization
  • Materials
  • Measurement
  • Microwave Frequency
  • Polycrystals
  • Porosity
  • Saturation
  • Spin Waves
  • X Band

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Microwave Engineering.
  • Plasma Physics / Magnetohydrodynamics