文章基本信息

标题：Cooling field and temperature dependent exchange bias in spin glass/ferromagnet bilayers
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作者：W. B. Rui ; Y. Hu ; A. Du 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep13640
语种：English
出版社：Springer Nature
摘要：We report on the experimental and theoretical studies of cooling field ( H _FC) and temperature ( T ) dependent exchange bias (EB) in Fe_xAu_{1 − x}/Fe₁₉Ni₈₁ spin glass (SG)/ferromagnet (FM) bilayers. When x varies from 8% to 14% in the Fe_xAu_{1 − x} SG alloys, with increasing T , a sign-changeable exchange bias field ( H _E) together with a unimodal distribution of coercivity ( H _C) are observed. Significantly, increasing in the magnitude of H _FC reduces (increases) the value of H _E in the negative (positive) region, resulting in the entire H _E ∼ T curve to move leftwards and upwards. In the meanwhile, H _FC variation has weak effects on H _C. By Monte Carlo simulation using a SG/FM vector model, we are able to reproduce such H _E dependences on T and H _FC for the SG/FM system. Thus this work reveals that the SG/FM bilayer system containing intimately coupled interface, instead of a single SG layer, is responsible for the novel EB properties.