NDLI: Effect of particle agglomeration on the magnetization reversal of fine powders

Content Provider	IEEE Xplore Digital Library
Author	Hirsch, A. Eliezer, Z.
Copyright Year	1965
Abstract	The magnetization reversal of loose low-coercivity fine powders of magnetite or iron is independent of the value of the particle packing fraction. However, when these powders are compacted under pressure in a solid matrix of Perspex, the coercivity of the samples increases logarithmically with the increasing powder density. We assume that in these powders small superparamagnetic particles are agglomerated into clusters. Supposing the magnetization process to be due to a nucleation mechanism, the critical field at which this nucleation starts appears to be a function of the number of particles agglomerated in a cluster. This number varies with the density of the powder compacted in the matrix. By the suggested theoretical model, we have estimated the diameter of the superparamagnetic particles of the experimentally investigated fine iron powder to be approximately 46 Å. Valuable information about the magnetic structure of these powders has been obtained from the studies of the hyperfine splitting in their Mössbauer patterns and from those of the changes in the line intensities caused by the application of an external magnetic field.
Sponsorship	IEEE Magnetics Society
Starting Page	249
Ending Page	254
Page Count	6
File Size	739234
File Format	PDF
ISSN	00189464
Volume Number	4
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1968-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetization reversal Powders Magnetic anisotropy Perpendicular magnetic anisotropy Permanent magnets Coercive force Ferrites Magnetic properties Manganese Magnetic materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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