Simulation of magnetization behaviours of Sm(Co,Fe,Cu,Zr)z magnet with low Cu content

doi:10.1088/1674-1056/18/6/077

Abstract

Abstract The effects of microstructure, cell orientation and temperature on magnetic properties and the coercivity mechanism in Sm(Co,Fe,Cu,Zr)z with low Cu content are studied by using the micromagnetic finite element method in this paper. The simulations of the demagnetization behaviours indicate that the pinning effect weakens gradually with the thickness of cell boundary decreasing and strengthens gradually with the cell size decreasing. Because of the intergrain exchange coupling, the coercivity mechanism is determined by the difference in magnetocrystalline anisotropy between the cell phase and the cell boundary phase. And the coercivity mechanism is related to not only the cells alignment but also temperature. With temperature increasing, a transformation of the demagnetization mechanism occurs from the domain pinning to the uniform magnetization reversal mode and the transformation temperature is about 650 K.

Keywords: micromagnetic finite element method microstructure cell orientation temperature

Received: 17 September 2008
Revised: 28 November 2008
Accepted manuscript online:

PACS:	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	61.66.Dk	(Alloys )
	75.30.Gw	(Magnetic anisotropy)
	75.50.Ww	(Permanent magnets)
	75.60.Jk	(Magnetization reversal mechanisms)

Fund: Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No Y407174).

Cite this article:

Chen Ren-Jie(陈仁杰), Zhang Hong-Wei(张宏伟), Shen Bao-Gen(沈保根), Yan A-Ru(闫阿儒), and Chen Li-Dong(陈立东) Simulation of magnetization behaviours of Sm(Co,Fe,Cu,Zr)z magnet with low Cu content 2009 Chin. Phys. B 18 2582

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Simulation of magnetization behaviours of Sm(Co,Fe,Cu,Zr)z magnet with low Cu content

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