Exchange-bias effect at La0.75Sr0.25MnO3/LaNiO3 interfaces
Exchange-bias effect at La0.75Sr0.25MnO3/LaNiO3 interfaces
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DOI：
10.1103/physrevb.85.094427
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发表时间：
2012-03-26
影响因子：
3.7
通讯作者：
Steren, L. B.
中科院分区：
文献类型：
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作者：
Rojas Sanchez, J. C.;Nelson-Cheeseman, B.;Steren, L. B.
我们发现，铁磁/顺磁La0.75Sr0.25MnO3/LaNiO 3多层膜提出了一个意想不到的磁交换偏置效应（EBE），观察场冷却磁化回路。在50 K附近，交换偏置场和双折射率的增强消失。我们表明，氧化态的Ni和Mn阳离子的变化从Mn 3 +-Ni 3+到Mn 4 +-Ni 2+的层接近的界面探测的X-射线吸收光谱测量。的价态的变化是伴随着在La 0.75Sr 0.25MnO 3/LaNiO 3界面的阳离子的磁性行为的变化，可能会导致形成的磁性或磁挫区域，可以钉扎的铁磁性La 0.75Sr 0.25MnO 3层和解释的EBE。
We show that ferromagnetic/paramagnetic La0.75Sr0.25MnO3/LaNiO3 multilayers present an unexpected magnetic exchange-bias effect (EBE), observed in field-cooled magnetization loops. The exchange-bias field and the enhancement of the coercivity vanish around 50 K. We demonstrate that the oxidation state of the Ni and Mn cations changes from Mn3+-Ni3+ to Mn4+-Ni2+ in the layers close to the interface probed by x-ray absorption spectroscopy measurements. The variation of the valence states is accompanied by a change in the magnetic behavior of the cations at the La0.75Sr0.25MnO3/LaNiO3 interface, possibly giving rise to the formation of magnetic or magnetically frustrated regions that may pin the ferromagnetic La0.75Sr0.25MnO3 layers and explain the EBE.