The Suppression of Demagnetizing Field Heterogeneity in Ferromagnetic Powders

Author:

Yaroslavtsev Roman1,Komogortsev Sergey2,Chekanova Lydia3,Kuzovnikova Ludmila4,Denisova Elena3,Li Oksana1,Velikanov Dmitry3,Iskhakov Rauf3

Affiliation:

1. Siberian Federal University

2. SB Russian Academy of Sciences

3. Institute of Physics, SB Russian Academy of Sciences

4. Krasnoyarsk Institute of Railways Transport

Abstract

The two ways of reducing the dispersion of the demagnetizing fields in magnetic powders of cobalt alloys have been tested: the isolation of magnetic particles in nonmagnetic matrix and compaction of the powders. The ferromagnetic resonance (FMR) and the hysteresis loops of the pretreated magnetic powders were investigated. The FMR linewidth is significantly narrowed both with increasing of the nonmagnetic fraction in the samples prepared by the first way and with increasing of relative density of the compacts. The limit case of FMR linewidth in continuous magnetic film there is no dispersion of the demagnetizing fields is in good agreement with discussed data. The hysteresis loops of powder with the particles coated by the non-magnetic phase became narrow and easy saturated with increasing of nonmagnetic phase fraction.

Publisher

Trans Tech Publications, Ltd.

Subject

Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics

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