Accession Number : AD0624718

Title :   THE PRESENT STATUS OF THE TEMPERATURE DEPENDENCE OF MAGNETOCYRSTALLINE ANISOTROPY, AND THE L(L+1)/2 POWER LAW.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSICS

Personal Author(s) : Callen,Herbert ; Callen,Earl

Report Date : AUG 1965

Pagination or Media Count : 47

Abstract : The theory of the temperature dependence of magnetocrystalline anisotropy in ferromagnetic insulators is reviewed and summarized. The l(l+1)/2 power law for the behavior at low temperatures is derived in a general fashion and the extension to arbitrary temperatures is also given. It is then shown that the l(l+1)/2 power law is not directly applicable to antiferromagnets, but that contrary to current opinion, quantum corrections to the ground state introduce significant alterations. The magnetic field dependence of the anisotropy energy and the l(l+1)/2 power law for the temperature dependence of magnetostriction are discussed. (Author)

Descriptors :   (*ANISOTROPY, CRYSTALS), (*FIELD THEORY, FERROMAGNETIC MATERIALS), TEMPERATURE, MAGNETOSTRICTION, MAGNETIC FIELDS, QUANTUM THEORY, SPINNING(MOTION), POWER, GROUND STATE

Subject Categories : Crystallography
      Electricity and Magnetism
      Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE