Accession Number : AD0709076

Title :   THEORETICAL STUDY OF THE MAGNETIC PROPERTIES OF SOLIDS.

Descriptive Note : Final rept. 1 Sep 63-31 Oct 69,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS

Personal Author(s) : Orbach,Raymond L. ; Pincus,Philip A.

Report Date : 31 OCT 1969

Pagination or Media Count : 33

Abstract : The absorptive and dispersive components of the magnetic susceptibility at microwave frequencies is calculated for dilute magnetic alloys. A complete response theory is developed which exhibits the magnetic resonance bottleneck, as well as the frequency dependence of the loss rates. Magnetic colloids are examined with reference to non-mechanical pumps. Liquid ferromagnets are demonstrated to have Block walls of infinite thickness, with no conventional domain structure. The response of an isolated uniaxial magnetic grain suspended in a liquid to an applied rotating rf field is calculated. In a large static magnetic field, a critical frequency obtains below which a steady state is reached, but above which the mechanical behavior depends crucially on the initial conditions. A theory is developed for the determination of the orientational order in liquid crystals using magnetic resonance. Energy transfer in laser materials is studied. Special attention is given to the ability of loss centers to communicate with the bulk single ions in the presence of inhomogeneous broadening. It is demonstrated that a critical concentration exists below which this communication is impossible, and above which communication is rapid. A superexchange model is used for the single ion-single ion coupling. (Author)

Descriptors :   (*MAGNETIC ALLOYS, MAGNETIC PROPERTIES), (*COLLOIDS, MAGNETIC PROPERTIES), (*LASERS, SOLID STATE PHYSICS), TUNNELING(ELECTRONICS), MICROWAVE FREQUENCY, MAGNETIC RESONANCE, ELECTRON PARAMAGNETIC RESONANCE, SUPERCONDUCTORS, IMPURITIES

Subject Categories : Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE