Accession Number : AD0706905

Title :   CONDUCTION PROCESSES IN FERROMAGNETIC ALLOYS.

Descriptive Note : Rept. no. 2 (Final), Jan 69-Mar 70,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF PHYSICS

Personal Author(s) : Berger,Luc

Report Date : MAR 1970

Pagination or Media Count : 51

Abstract : Hall effect and magnetoresistance were measured in iron (resistivity ratio 1991 and 507) and in Fe-Co with 0.25, 0.50, 0.92%Co, in fields up to 7 Tesla at 4.2K. High-field and low-field Hall angles are related to asymmetric scattering. A side-jump mechanism is proposed for the Hall effect of ferromagnets at room temperature. It is found that the center of mass of a wave-packet undergoes a discontinuous and finite sideway displacement (delta y) of approximately 10 to the 11th power meter on scattering by a central potential, in the presence of spin-orbit interaction. Magnon heat conduction was detected in 70Ni-30Fe and 81Ni-19Fe, between 1.5K and 4K, up to 6 Tesla. Magnon conductivity varies as approximately T squared, and represents about 3.5% of total conductivity at 4K. Thermal-magnon life-time is about (2 x 10 to the -10th power) sec. (Author)

Descriptors :   (*MAGNETIC ALLOYS, TRANSPORT PROPERTIES), ELECTRICAL CONDUCTIVITY, THERMAL CONDUCTIVITY, HALL EFFECT, COBALT ALLOYS, IRON ALLOYS, NICKEL ALLOYS, MAGNETIC MOMENTS, CRYOGENICS

Subject Categories : Electricity and Magnetism
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE