MAGNETIC METHOD FOR THE DETERMINATION OF THE ANISOTROPY DISTRIBUTION IN FERROMAGNETIC POWDERS
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1961
- Accession Number
- AD0262027
Entities
People
- P.j. Flanders
- S. Shtrikman
Organizations
- Franklin Institute