Accession Number : AD0618146

Title :   EQUIATOMIC TRANSITION METAL ALLOYS OF MANGANESE. IV. A NEUTRON DIFFRACTION STUDY OF MAGNETIC ORDERING IN THE PTMN PHASE,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF PURE PHYSICS

Personal Author(s) : Andresen,A. F. ; Kjekshus,A. ; Mollerud,R. ; Pearson,W. B.

Report Date : 24 NOV 1964

Pagination or Media Count : 12

Abstract : From x-ray and neutron diffraction and magnetic susceptibility measurements, the PtMn phase with the CuAuI type structure is found to exhibit anti-ferromagnetic arrangement of the magnetic moments with spin quantum number 4/2 for the Mn atoms and 0 for the Pt atoms. The moments of nearest-neighbour Mn atoms in (001) planes are anti-parallel to each other, and the direction of the moments changes from parallel to c in alloys with 50 at. % Pt and less, to perpendicular to c with more than 50 at. % Pt. Neel temperatures are observed in the range from 840 to 970 K. At lower temperatures the alloys show weak ferromagnetism which is believed to result from canting of the moments. (Author)

Descriptors :   (*MANGANESE ALLOYS, TRANSITION METALS), (*MAGNETIC PROPERTIES, MANGANESE ALLOYS), (*NEUTRON DIFFRACTION, MAGNETIC PROPERTIES), X RAY DIFFRACTION, PHASE STUDIES, CRYSTAL STRUCTURE, ANTIFERROMAGNETISM, PLATINUM ALLOYS, TRANSITION TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE