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Model of hybrid interfacial domain wall in ferromagnetic/antiferromagnetic bilayers |
Zhang Wen (章文)a, Zhai Ya (翟亚)a, Lu Mu (鹿牧)b, You Biao (游彪)b, Zhai Hong-Ru (翟宏如)b, Caroline G Morganc |
a Department of Physics, Southeast University, Nanjing 211189, China;
b National Laboratory of Solid Microstructure, Nanjing University, Nanjing 210093, China;
c Physics Department, Wayne State University, Detroit, MI 48202, USA |
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Abstract A general model of a hybrid interfacial domain wall (HIDW) in ferromagnetic/antiferromagnetic exchange biased bilayers is proposed, where an interfacial domain wall is allowed to extend into either the ferromagnetic or antiferromagnetic layer or across both. The proposition is based on our theoretical investigation on thickness and field dependences of ferromagnetic domain wall (FMDW) and antiferromagnetic domain wall (AFDW), respectively. Good match of the simulation to the hysteresis loops of a series of NiFe/FeMn exchange-biased bilayers confirms the existence of the HIDW, where the AFDW part is found to preferentially occupy the entire antiferromagnetic layer while the FMDW shrinks with the increased magnetic field as expected. The observed asymmetry between the ascending and descending branches of the hysteresis loop is explained naturally as a consequence of different partition ratios between AFDW and FMDW.
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Received: 15 September 2014
Revised: 25 September 2014
Accepted manuscript online:
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PACS:
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75.60.Ch
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(Domain walls and domain structure)
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75.60.Ej
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(Magnetization curves, hysteresis, Barkhausen and related effects)
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75.70.Cn
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(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
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75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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Fund: Project supported by the National Basic Research Program, China (Grant No. 2010CB923404), the National Natural Science Foundation for Young Scientists of China (Grant No. 61306121), and the China Postdoctoral Science Foundation (Grant No. 2013M541580). |
Corresponding Authors:
Zhai Ya
E-mail: yazhai@seu.edu.cn
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Cite this article:
Zhang Wen (章文), Zhai Ya (翟亚), Lu Mu (鹿牧), You Biao (游彪), Zhai Hong-Ru (翟宏如), Caroline G Morgan Model of hybrid interfacial domain wall in ferromagnetic/antiferromagnetic bilayers 2015 Chin. Phys. B 24 047502
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