Accession Number : AD0262027

Title :   MAGNETIC METHOD FOR THE DETERMINATION OF THE ANISOTROPY DISTRIBUTION IN FERROMAGNETIC POWDERS

Corporate Author : FRANKLIN INST PHILADELPHIA PA LABS FOR RESEARCH AND DEVELOPMENT

Personal Author(s) : FLANDERS,P.J. ; SHTRIKMAN,S.

Report Date : AUG 1961

Pagination or Media Count : 1

Abstract : A technique to determine the anisotropy distribution in a ferromagnetic powder consisting of uniaxial particles has b n developed which can be used for samples with randomly oriented particles as well as with oriented samples. In principle it eliminates incoherent magnetization reversals. It involves saturating the material in a magnetic field and then making torque measurements at an angle several degrees away from the saturating direction. In these measurements the torque on the specimen as a function of magnetic field is recorded as the field is cycled from zero to a specified field and then reduced to zero. This cycling procedure is continued, gradually increasing the maximum applied field upon subsequent cycles until the magnetic field exceeds the highest anisotropy field of the particles in the distribution. For elongated gamma-Fe2O3 particles this technique gives length to width distributions which approach those observed by the electron microscope technique. (Author)

Descriptors :   *FERROMAGNETIC MATERIALS, ANISOTROPY, DETERMINATION, MAGNETIC FIELDS, MAGNETIC PROPERTIES, MAGNETOMETERS, MEASUREMENT, PARTICLES, PHYSICAL PROPERTIES, POWDERS, TEST METHODS, TORQUE

Distribution Statement : APPROVED FOR PUBLIC RELEASE