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

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365699· OSTI ID:542563

Tellez-Blanco, J C; Kou, X C; Groessinger, R ^[1]; Estevez-Rams, E; Fidler, J ^[2]; Ma, B M ^[3]

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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)

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.}

• OSTI ID: 542563
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 82; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
COBALT ALLOYS
COERCIVE FORCE
COPPER ALLOYS
FERRIMAGNETIC MATERIALS
HYSTERESIS
IRON ALLOYS
MAGNETIZATION
NUCLEATION
PERMANENT MAGNETS
SAMARIUM ALLOYS
SINTERED MATERIALS
SINTERING
TEMPERATURE DEPENDENCE
TRANSMISSION ELECTRON MICROSCOPY
ZIRCONIUM ALLOYS