Accession Number : AD0711087

Title :   TEMPERATURE DEPENDENCE OF THE INITIAL PERMEABILITY OF A FERROMAGNETIC AMORPHOUS Co-P ALLOY.

Descriptive Note : Technical rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS

Personal Author(s) : DE Lau,J. G. M.

Report Date : JUL 1970

Pagination or Media Count : 10

Abstract : The existence of amorphous solids which are ferromagnetic was predicted on theoretical grounds by Gubanov in 1960. Since then it has been demonstrated experimentally by a number of investigators. There have been several recent reports of magnetic property measurements on amorphous Fe-containing alloys made by rapid cooling from the liquid state. Tsuei, Longworth and Lin measured the magnetization as a function of the temperature of an amorphous Fe-P-C alloy and found a Curie temperature much lower than that of pure iron. Mossbauer experiments showed a nonunique hyperfine field at the nuclei which is consistent with a model of a disordered alloy with a spread in interatomic spacing. Sinha reported magnetization and paramagnetic susceptibility measurements on Fe-Mn-P-C alloys. He supposed that the magnetic structures are complex in some of the alloys: ferrimagnetism existing in conjunction with parasitic antiferromagnetism. Hasegawa found superparamagnetic clusters and also ferromagnetism in Pd-Fe-Si alloys. The Curie temperature is much lower as a result of the weaker exchange interaction in the amorphous alloy as compared to the corresponding crystalline alloy. This paper describes the measurements of the initial permeability of a ferromagnetic amorphous Co-P alloy made by electrodeposition. (Author)

Descriptors :   (*SOLID SOLUTIONS, FERROMAGNETIC MATERIALS), (*FERROMAGNETIC MATERIALS, PERMEABILITY(MAGNETIC)), COBALT ALLOYS, PHOSPHORUS ALLOYS, ANISOTROPY, ANNEALING

Subject Categories : Miscellaneous Materials
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE