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Title: Coercivity and magnetic anisotropy of sintered Sm{sub 2}Co{sub 17}-type permanent magnets

Abstract

Anisotropic and isotropic Sm{sub 2}Co{sub 17}-type permanent magnets have been prepared by using the conventional sintering technique. Transmission electron microscopy was used to characterize the cellular structure within the Sm{sub 2}(Fe,Co){sub 17} grains. Hysteresis loops (M{approximately}H) were measured in the temperature range from 4.2 to about 1000 K by using a pulsed-field magnetometer with a maximum field strength up to 24 MA/m. The magnetocrystalline anisotropy field H{sub A} has been measured up to 1000 K by using the singular point detection technique on anisotropic samples with external fields applied perpendicular to the magnetic alignment direction. The saturation magnetization M{sub s} has been measured on anisotropic samples with external fields applied parallel to the magnetic alignment direction. From studies of the coercivity mechanism by using a micromagnetic analysis of the temperature dependence of the coercivity field, it follows that the coercivity of Sm(Co,Fe,Cu,Zr){sub z} is controlled at elevated temperature (above 520 K) by a nucleation process of reversal domains. {copyright} {ital 1997 American Institute of Physics.}

Authors:
; ;  [1]; ;  [2];  [3]
  1. Institute for Experimental Physics, Vienna University of Technology, A-1040 Vienna (Austria)
  2. Institute for Applied Physics, Vienna University of Technology, A-1040 Vienna (Austria)
  3. Rhone-Poulenc, Rare Earths and Gallium, CN 7500, Granbury, New Jersey 08512 (United States)
Publication Date:
OSTI Identifier:
542563
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 82; Journal Issue: 8; Other Information: PBD: Oct 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SAMARIUM ALLOYS; COERCIVE FORCE; COBALT ALLOYS; IRON ALLOYS; SINTERING; TRANSMISSION ELECTRON MICROSCOPY; NUCLEATION; FERRIMAGNETIC MATERIALS; COPPER ALLOYS; ZIRCONIUM ALLOYS; SINTERED MATERIALS; PERMANENT MAGNETS; MAGNETIZATION; HYSTERESIS; TEMPERATURE DEPENDENCE; ANISOTROPY

Citation Formats

Tellez-Blanco, J C, Kou, X C, Groessinger, R, Estevez-Rams, E, Fidler, J, and Ma, B M. Coercivity and magnetic anisotropy of sintered Sm{sub 2}Co{sub 17}-type permanent magnets. United States: N. p., 1997. Web. doi:10.1063/1.365699.
Tellez-Blanco, J C, Kou, X C, Groessinger, R, Estevez-Rams, E, Fidler, J, & Ma, B M. Coercivity and magnetic anisotropy of sintered Sm{sub 2}Co{sub 17}-type permanent magnets. United States. https://doi.org/10.1063/1.365699
Tellez-Blanco, J C, Kou, X C, Groessinger, R, Estevez-Rams, E, Fidler, J, and Ma, B M. 1997. "Coercivity and magnetic anisotropy of sintered Sm{sub 2}Co{sub 17}-type permanent magnets". United States. https://doi.org/10.1063/1.365699.
@article{osti_542563,
title = {Coercivity and magnetic anisotropy of sintered Sm{sub 2}Co{sub 17}-type permanent magnets},
author = {Tellez-Blanco, J C and Kou, X C and Groessinger, R and Estevez-Rams, E and Fidler, J and Ma, B M},
abstractNote = {Anisotropic and isotropic Sm{sub 2}Co{sub 17}-type permanent magnets have been prepared by using the conventional sintering technique. Transmission electron microscopy was used to characterize the cellular structure within the Sm{sub 2}(Fe,Co){sub 17} grains. Hysteresis loops (M{approximately}H) were measured in the temperature range from 4.2 to about 1000 K by using a pulsed-field magnetometer with a maximum field strength up to 24 MA/m. The magnetocrystalline anisotropy field H{sub A} has been measured up to 1000 K by using the singular point detection technique on anisotropic samples with external fields applied perpendicular to the magnetic alignment direction. The saturation magnetization M{sub s} has been measured on anisotropic samples with external fields applied parallel to the magnetic alignment direction. From studies of the coercivity mechanism by using a micromagnetic analysis of the temperature dependence of the coercivity field, it follows that the coercivity of Sm(Co,Fe,Cu,Zr){sub z} is controlled at elevated temperature (above 520 K) by a nucleation process of reversal domains. {copyright} {ital 1997 American Institute of Physics.}},
doi = {10.1063/1.365699},
url = {https://www.osti.gov/biblio/542563}, journal = {Journal of Applied Physics},
number = 8,
volume = 82,
place = {United States},
year = {Wed Oct 01 00:00:00 EDT 1997},
month = {Wed Oct 01 00:00:00 EDT 1997}
}