Coercivity and magnetic anisotropy of sintered Sm{sub 2}Co{sub 17}-type permanent magnets
- Institute for Experimental Physics, Vienna University of Technology, A-1040 Vienna (Austria)
- Institute for Applied Physics, Vienna University of Technology, A-1040 Vienna (Austria)
- 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, Vol. 82, Issue 8; Other Information: PBD: Oct 1997
- Country of Publication:
- United States
- Language:
- English
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