Micromagnetic simulation of Sm-Co/α-Fe/Sm-Co trilayers with various angles between easy axes and the film plane

doi:10.1088/1674-1056/23/9/097504

Abstract Hysteresis loops and energy products have been calculated systematically by a three-dimensional (3D) software OOMMF for Sm-Co/α-Fe/Sm-Co trilayers with various thicknesses and β, where β is the angle between the easy axis and the field applied perpendicular to the film plane. It is found that trilayers with a perpendicular anisotropy possess considerably larger coercivities and smaller remanences and energy products compared with those with an in-plane anisotropy. Increase of β leads to a fast decrease of the maximum energy product as well as the drop of both remanence and coercivity. Such a drop is much faster than that in the single-phased hard material, which can explain the significant discrepancy between the experiment and the theoretical energy products. Some modeling techniques have been utilized with spin check procedures performed, which yield results in good agreement with the one-dimensional (1D) analytical and experimental data, justifying our calculations. Further, the calculated nucleation fields according to the 3D calculations are larger than those based on the 1D model, whereas the corresponding coercivity is smaller, leading to more square hysteresis loops and better agreement between experimental data and the theory.

Keywords: micromagnetic simulation hard/soft trilayers hysteresis loops magnetization configuration

Received: 16 February 2014
Revised: 13 March 2014
Accepted manuscript online:

PACS:	75.60.Jk	(Magnetization reversal mechanisms)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	75.70.Cn	(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
	75.50.Ss	(Magnetic recording materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11074179, 10747007, 51331003, 51371011, and 51001002), the State Key Development Program of Basic Research of China (Grant No. 2010CB934600), the Construction Plan for Scientific Research Innovation Teams of Universities in Sichuan Province, China (Grant No. 12TD008), the Beijing Municipal Natural Science Foundation, China (Grant No. 2122006), and Scientific Research Innovation Fund for Student in Sichuan Normal University, China.

Corresponding Authors: Zhao Guo-Ping
E-mail: zhaogp@uestc.edu.cn;_zapple2004@yahoo.com

Cite this article:

Zhang Xi-Chao (张溪超), Zhao Guo-Ping (赵国平), Xia Jing (夏静), Yue Ming (岳明), Yuan Xin-Hong (袁新红), Xie Lin-Hua (谢林华) Micromagnetic simulation of Sm-Co/α-Fe/Sm-Co trilayers with various angles between easy axes and the film plane 2014 Chin. Phys. B 23 097504

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Micromagnetic simulation of Sm-Co/α-Fe/Sm-Co trilayers with various angles between easy axes and the film plane

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