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Title: Synthesis of high-energy magnet materials: Coercivity mechanism, surface studies, and new alloys

Abstract

To date, in spite of extensive studies, only five energy permanent magnet materials have been discovered. Hence there is an ongoing search for new materials, One, SmTi(Fe,Co)11, is promising. One characteristic required on a material is high uniaxial magnetic anisotropy. This is supplied by the rare earth crystal field interaction. This interaction is now understood well enough to have predictive value. A new use of Auger spectroscopy has revealed that the grains in Nd-Fe-B magnets are covered by a neodymium-rich film about 30-50 A thick. This iron-deficient layer is proposed to be of crucial value for high coercivity. High energy magnets are in widespread use but mostly in high technology applications. Cheaper magnets are needed for normal uses, e.g., household appliances. Lowering cost and obtaining higher flux materials are the greatest technological challenges. Understanding coercivity is the greatest scientific challenge.

Authors:
; ; ;
Publication Date:
Research Org.:
Carnegie-Mellon Univ., Pittsburgh, PA (USA). Dept. of Metallurgical Engineering and Materials Science
OSTI Identifier:
6260874
Report Number(s):
AD-A-226152/7/XAB
CNN: DAAL03-87-K-0150
Resource Type:
Technical Report
Resource Relation:
Other Information: Pub. in Jnl. of Materials Science and Engineering, Vol. B3, 351-354(1989)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PERMANENT MAGNETS; MAGNETIC MATERIALS; ANISOTROPY; AUGER ELECTRON SPECTROSCOPY; COBALT ALLOYS; COST; ENERGY; IRON ALLOYS; MAGNETIC FIELDS; MAGNETIC PROPERTIES; RARE EARTH ALLOYS; SAMARIUM ALLOYS; SYNTHESIS; TITANIUM ALLOYS; ALLOYS; ELECTRON SPECTROSCOPY; MAGNETS; MATERIALS; PHYSICAL PROPERTIES; SPECTROSCOPY; 360104* - Metals & Alloys- Physical Properties

Citation Formats

Wallace, W E, Sankar, S G, Elbicki, J M, and Cheng, S F. Synthesis of high-energy magnet materials: Coercivity mechanism, surface studies, and new alloys. United States: N. p., 1989. Web.
Wallace, W E, Sankar, S G, Elbicki, J M, & Cheng, S F. Synthesis of high-energy magnet materials: Coercivity mechanism, surface studies, and new alloys. United States.
Wallace, W E, Sankar, S G, Elbicki, J M, and Cheng, S F. 1989. "Synthesis of high-energy magnet materials: Coercivity mechanism, surface studies, and new alloys". United States.
@article{osti_6260874,
title = {Synthesis of high-energy magnet materials: Coercivity mechanism, surface studies, and new alloys},
author = {Wallace, W E and Sankar, S G and Elbicki, J M and Cheng, S F},
abstractNote = {To date, in spite of extensive studies, only five energy permanent magnet materials have been discovered. Hence there is an ongoing search for new materials, One, SmTi(Fe,Co)11, is promising. One characteristic required on a material is high uniaxial magnetic anisotropy. This is supplied by the rare earth crystal field interaction. This interaction is now understood well enough to have predictive value. A new use of Auger spectroscopy has revealed that the grains in Nd-Fe-B magnets are covered by a neodymium-rich film about 30-50 A thick. This iron-deficient layer is proposed to be of crucial value for high coercivity. High energy magnets are in widespread use but mostly in high technology applications. Cheaper magnets are needed for normal uses, e.g., household appliances. Lowering cost and obtaining higher flux materials are the greatest technological challenges. Understanding coercivity is the greatest scientific challenge.},
doi = {},
url = {https://www.osti.gov/biblio/6260874}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1989},
month = {Sun Jan 01 00:00:00 EST 1989}
}

Technical Report:
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