Accession Number : AD0485830

Title :   RESEARCH ON RELAXATION PROCESSES IN MAGNETIC MATERIALS.

Descriptive Note : Progress rept. no. 7, 1 Jan-31 Mar 66,

Corporate Author : RAYTHEON CO WALTHAM MA RESEARCH DIV

Personal Author(s) : Schlomann, E.

Report Date : APR 1966

Pagination or Media Count : 35

Abstract : The properties of magnetic material having a nonuniform saturation magnetization are reviewed, in particular their high field-magnetization curve and their longitudinal, differential susceptibility at microwave frequencies. An investigation of the high-field magnetization curve of porous, polycrystalline Yttrium-Iron garnet is described. The results of a theoretical calculation of the transverse suceptibility of magnetically inhomogeneous materials are presented. In these preliminary calculations it has been assumed that the inhomogeneity is 'coarse grain' and that the spin-wave resonances are infinitely narrow. Experimental work concerning the instability threshold in dense, polycrystalline Yttrium-Iron garnet for parallel and perpendicular pumping is described. (Author)

Descriptors :   (*MAGNETIC MATERIALS, RELAXATION TIME), YTTRIUM, IRON, GARNET, MAGNETIC PROPERTIES, MICROWAVES, RADIOFREQUENCY.

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE