Effect of exchange coupling on magnetic property in Sm-Co/α-Fe layered system

doi:10.1088/1674-1056/25/3/037501

Abstract The hysteresis loops as well as the spin distributions of Sm-Co/α-Fe bilayers have been investigated by both three-dimensional (3D) and one-dimensional (1D) micromagnetic calculations, focusing on the effect of the interface exchange coupling under various soft layer thicknesses t^s. The exchange coupling coefficient A^hs between the hard and soft layers varies from 1.8× 10^-6 erg/cm to 0.45× 10^-6 erg/cm, while the soft layer thickness increases from 2 nm to 10 nm. As the exchange coupling decreases, the squareness of the loop gradually deteriorates, both pinning and coercive fields rise up monotonically, and the nucleation field goes down. On the other hand, an increment of the soft layer thickness leads to a significant drop of the nucleation field, the deterioration of the hysteresis loop squareness, and an increase of the remanence. The simulated loops based on the 3D and 1D methods are consistent with each other and in good agreement with the measured loops for Sm-Co/α-Fe multilayers.

Keywords: hysteresis loops exchange coupling micromagnetics hard/soft bilayers

Received: 16 September 2015
Revised: 05 November 2015
Accepted manuscript online:

PACS:	75.70.Cn	(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
	75.40.Mg	(Numerical simulation studies)
	75.30.Gw	(Magnetic anisotropy)
	75.50.Ee	(Antiferromagnetics)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11074179 and 10747007), the National Basic Research Program of China (Grant No. 2014CB643702), the Zhejiang Provincial Natural Science Foundation of China (Grant No. LY14E010006), the Construction Plan for Scientific Research Innovation Teams of Universities in Sichuan Province, China (Grant No. 12TD008), the Scientific Research Foundation for the Returned Overseas Chinese Scholars of the Education Ministry, China, and the Program for Key Science and Technology Innovation Team of Zhejiang Province, China (Grant No. 2013TD08).

Corresponding Authors: G P Zhao, W X Xia
E-mail: zhaogp@uestc.edu.cn;xiawxing@nimte.ac.cn

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C X Sang(桑成祥), G P Zhao(赵国平), W X Xia(夏卫星), X L Wan(万秀琳), F J Morvan, X C Zhang(张溪超), L H Xie(谢林华), J Zhang(张健), J Du(杜娟), A R Yan(闫阿儒), P Liu(刘平) Effect of exchange coupling on magnetic property in Sm-Co/α-Fe layered system 2016 Chin. Phys. B 25 037501

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Effect of exchange coupling on magnetic property in Sm-Co/α-Fe layered system

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