Accession Number : AD0832761

Title :   RESEARCH TO INVESTIGATE FUNDAMENTAL MAGNETIC INTERACTIONS IN SELECTED MATERIALS.

Descriptive Note : Summary technical rept. 1 Jan-31 Dec 67,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY NY RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Becker, Joseph J. ; Cech, Robert E. ; Kasper, James S. ; Kouvel, James S.

Report Date : APR 1968

Pagination or Media Count : 65

Abstract : Section I of this report describes the continuing investigation of intermetallic compounds of the type Co5R, where R is yttrium or a rare earth, as permanent magnet materials. The theoretical interpretation of the behavior of these materials based on domain boundary nucleation and motion has been refined, and further calculations are presented. Experimental results verifying this model have been obtained. A sensitivity of the coercive force to surface condition predicted by this model was confirmed experimentally. The investigation of the stability of Co5R materials in particle form has continued. Section II describes the investigation of several materials near the Curie point. Both CrO2 and nickel are found to obey the same special equation of state. When analyzed in this way, both ordered and disordered FePd3 are found to deviate from predictions based on the molecular field model. The results obtained from an analysis of x-ray and neutron diffraction work on Co17Y2 and Co17Ho2 are described in Section III. (Author)

Descriptors :   (*RARE EARTH COMPOUNDS, MAGNETIC PROPERTIES), (*INTERMETALLIC COMPOUNDS, MAGNETIC PROPERTIES), MAGNETS, ANISOTROPY, HYSTERESIS, ANNEALING, EQUATIONS OF STATE, NEUTRON DIFFRACTION, NICKEL, OXIDES, COBALT COMPOUNDS, IRON COMPOUNDS, CHROMIUM COMPOUNDS, HOLMIUM COMPOUNDS, PALLADIUM COMPOUNDS, YTTRIUM COMPOUNDS.

Subject Categories : Electrical and Electronic Equipment
      Electricity and Magnetism
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE