NDLI: Coercivity of titanium-substituted high-temperature permanent magnets

Content Provider	IEEE Xplore Digital Library
Author	Zhou, J. Skomski, R. Sellmyer, D.J.
Copyright Year	1965
Abstract	The temperature dependence of the coercivity of Sm-Co based magnets is investigated by magnetization measurements and model calculations. The Zr-free titanium-substituted Sm-Co material exhibits a positive temperature coefficient dH/sub c//dT of the coercivity (TCC) above room temperature, a reasonable hysteresis-loop shape, and an appreciable coercivity of 12.3 kOe at 500/spl deg/C for the nominal composition Sm(Co/sub 6.2/Cu/sub 0.8/Ti/sub 0.3/). The samples were produced by heat-treating the disordered 1:5 alloy commonly referred to as the TbCu/sub 7/ (or 1:7) phase. X-ray diffraction analysis shows that, upon annealing at 1165/spl deg/C, the starting material segregates into more-or-less stoichiometric 1:5 and 2:17 phases. The TCC is explained by taking into account that two-phase Sm-Co magnets are of the pinning type, that is the coercivity is realized by capturing (or repelling) domain walls at 1:5/2:17 phase boundaries. Starting from a planar-defect approach, the TCC is modeled as a function of the anisotropy constants of the involved phases. The present approach yields a fair agreement between theory and experiment, and explains the existence of a coercivity maximum in terms of the Cu concentration.
Sponsorship	IEEE Magnetics Society
Starting Page	2518
Ending Page	2520
Page Count	3
File Size	63959
File Format	PDF
ISSN	00189464
Volume Number	37
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coercive force Magnets Magnetic materials Temperature dependence Magnetization Composite materials Hysteresis Shape memory alloys X-ray diffraction Magnetic analysis
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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