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}
}