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New High-Performance Permanent Magnets Based on Rare Earth-Transition Metal Compounds

New High-Performance Permanent Magnets Based on Rare Earth-Transition Metal Compounds A large number of binary, rare earth (RE) transition metal (TM) inter­ metallic compounds have been studied (1,2), Of these, the RECos and RE2Cot7 alloys form the basis for materials with excellent permanent­ magnetic properties. These intermetallic compounds possess an ideal combination of magnetic and structural properties for applications. Nesbitt, Wernick, and co-workers were the first to establish the struc­ ture, magnetic moment, and high Curie temperature of RECos com­ pounds (3-6). An appreciable coercive field, [He, was reported in GdCos soon afterwards (7) and attributed to a high magneto-crystalline aniso­ tropy. However, it remained for Strnat and coworkers (8-10) to point out the high permanent-magnetic potential of the light RECos, based on their estimates of the anisotropy fields, HA, and to report the first [He values. Their investigations of the magnetic properties showed further­ more that SmC05 was clearly the most promising of these compounds (11). This fact was further justified by the results published in the following years by a number of laboratories (12-15). Das '(12) reported the first dense SmCos magnet with an energy product of 20 MGOe. Simul­ taneously, investigations began on precipitation-hardened copper­ containing RECos (16,17). By now SmCos magnets have become com­ http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Materials Research Annual Reviews

New High-Performance Permanent Magnets Based on Rare Earth-Transition Metal Compounds

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Publisher
Annual Reviews
Copyright
Copyright 1978 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
0084-6600
DOI
10.1146/annurev.ms.08.080178.000321
Publisher site
See Article on Publisher Site

Abstract

A large number of binary, rare earth (RE) transition metal (TM) inter­ metallic compounds have been studied (1,2), Of these, the RECos and RE2Cot7 alloys form the basis for materials with excellent permanent­ magnetic properties. These intermetallic compounds possess an ideal combination of magnetic and structural properties for applications. Nesbitt, Wernick, and co-workers were the first to establish the struc­ ture, magnetic moment, and high Curie temperature of RECos com­ pounds (3-6). An appreciable coercive field, [He, was reported in GdCos soon afterwards (7) and attributed to a high magneto-crystalline aniso­ tropy. However, it remained for Strnat and coworkers (8-10) to point out the high permanent-magnetic potential of the light RECos, based on their estimates of the anisotropy fields, HA, and to report the first [He values. Their investigations of the magnetic properties showed further­ more that SmC05 was clearly the most promising of these compounds (11). This fact was further justified by the results published in the following years by a number of laboratories (12-15). Das '(12) reported the first dense SmCos magnet with an energy product of 20 MGOe. Simul­ taneously, investigations began on precipitation-hardened copper­ containing RECos (16,17). By now SmCos magnets have become com­

Journal

Annual Review of Materials ResearchAnnual Reviews

Published: Aug 1, 1978

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