文章基本信息

标题：Positive exchange-bias and giant vertical hysteretic shift in La_0.3Sr_0.7FeO₃/SrRuO₃ bilayers
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作者：Rakesh Rana ; Parul Pandey ; R. P. Singh 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep04138
出版社：Springer Nature
摘要：The exchange-bias effects in the mosaic epitaxial bilayers of the itinerant ferromagnet (FM) SrRuO₃ and the antiferromagnetic (AFM) charge-ordered La_0.3Sr_0.7FeO₃ were investigated. An uncharacteristic low-field positive exchange bias, a cooling-field driven reversal of positive to negative exchange-bias and a layer thickness optimised unusual vertical magnetization shift were all novel facets of exchange bias realized for the first time in magnetic oxides. The successive magnetic training induces a transition from positive to negative exchange bias regime with changes in domain configurations. These observations are well corroborated by the hysteretic loop asymmetries which display the modifications in the AFM spin correlations. These exotic features emphasize the key role of i) mosaic disorder induced subtle interplay of competing AFM-superexchange and FM double exchange at the exchange biased interface and, ii) training induced irrecoverable alterations in the AFM spin structure.