Large Exchange Bias after Zero-Field Cooling from an Unmagnetized State

被引：332
作者：
Wang, B. M. [1 ]
Liu, Y. [1 ]
Ren, P. [2 ]
Xia, B. [2 ]
Ruan, K. B. [2 ]
Yi, J. B. [3 ]
Ding, J. [3 ]
Li, X. G. [4 ,5 ]
Wang, L. [2 ]
机构：
[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore
[2] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
[3] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 119260, Singapore
[4] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
[5] Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 07期
基金：
新加坡国家研究基金会;
关键词：
BILAYERS; NANOPARTICLES; ANISOTROPY;
D O I：
10.1103/PhysRevLett.106.077203
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Exchange bias (EB) is usually observed in systems with an interface between different magnetic phases after field cooling. Here we report an unusual phenomenon in which a large EB can be observed in Ni-Mn-In bulk alloys after zero-field cooling from an unmagnetized state. We propose that this is related to the newly formed interface between different magnetic phases during the initial magnetization process. The magnetic unidirectional anisotropy, which is the origin of the EB effect, can be created isothermally below the blocking temperature.
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页数：4
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