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arXiv 1306.1370cond-mat.str-elcond-mat.mtrl-sci
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双磁子晶格单相磁体中的巨交换偏置

Giant exchange bias in a single-phase magnet with two magnetic sublattices

Young Sun, Junzhuang Cong, Yisheng Chai, Liqin Yan, Yuelei Zhao, Shouguo Wang, Wei Ning, Yuheng Zhang

摘要:

交换偏置现象通常归因于铁磁层和反铁磁层界面处的交换耦合。在这里,我们提出了一种散装形式的交换偏置在一个单相磁铁,两个磁子晶格之间的耦合诱导场冷却后的矫顽场的显着转变。我们在复杂磁体YbFe_2 O_4中的实验表明,当Yb ~(3+)和Fe ~(2+)/Fe ~(3+)亚晶格发生耦合时,在低温下会产生巨大的交换偏置。冷却磁场依赖性和交换偏置的训练效应与我们的模型是一致的。与传统的界面交换偏置形成强烈对比的是,这种本体形式的交换偏置可以是巨大的,达到几特斯拉的量级。

英文摘要:

Exchange bias phenomenon is generally ascribed to the exchange coupling at the interfaces between ferromagnetic and antiferromagnetic layers. Here, we propose a bulk form of exchange bias in a single-phase magnet where the coupling between two magnetic sublattices induces a significant shift of the coercive field after a field cooling. Our experiments in a complicated magnet YbFe2O4 demonstrate a giant exchange bias at low temperature when the coupling between the Yb3+ and Fe2+/Fe3+ sublattices take places. The cooling magnetic field dependence and the training effect of exchange bias are consistent with our model. In strong contrast to conventional interfacial exchange bias, this bulk form of exchange bias can be huge, reaching the order of a few Tesla.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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