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Observation of giant exchange bias in bulk Mn50Ni42Sn8 Heusler alloy

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Title Observation of giant exchange bias in bulk Mn50Ni42Sn8 Heusler alloy
 
Creator SHARMA, J
SURESH, KG
 
Subject ANISOTROPY
FIELD
 
Description We report a giant exchange bias (EB) field of 3520 Oe in bulk Mn50Ni42Sn8 Heusler alloy. The low temperature magnetic state of the martensite phase has been studied by DC magnetization and AC susceptibility measurements. Frequency dependence of spin freezing temperature (T-f) on critical slowing down relation and observation of memory effect in zero field cooling mode confirms the super spin glass (SSG) phase at low temperatures. Large EB is attributed to the strong exchange coupling between the SSG clusters formed by small regions of ferromagnetic order embedded in an antiferromagnetic (AFM) matrix. The temperature and cooling field dependence of EB have been studied and related to the change in unidirectional anisotropy at SSG/AFM interface. The training effect also corroborates with the presence of frozen (SSG) moments at the interface and their role in EB. (C) 2015 AIP Publishing LLC.
 
Publisher AMER INST PHYSICS
 
Date 2016-01-15T07:40:05Z
2016-01-15T07:40:05Z
2015
 
Type Article
 
Identifier APPLIED PHYSICS LETTERS, 106(7)
0003-6951
1077-3118
http://dx.doi.org/10.1063/1.4913268
http://dspace.library.iitb.ac.in/jspui/handle/100/18073
 
Language en