Interfacial Spin Glass State and Exchange Bias in the Epitaxial La(0.7)Sr(0.3)MnO(3)/LaNiO(3) Bilayer.
Interfacial Spin Glass State and Exchange Bias in the Epitaxial La(0.7)Sr(0.3)MnO(3)/LaNiO(3) Bilayer.
复制标题
外延 La0.7Sr0.3MnO3/LaNiO3 双层中的界面自旋玻璃态和交换偏压
DOI：
10.1186/s11671-017-2110-0
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发表时间：
2017-12
影响因子：
--
通讯作者：
Xu XH
中科院分区：
文献类型：
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作者：
Zhou GW;Guan XF;Bai YH;Quan ZY;Jiang FX;Xu XH
研究了在SrTiO3 （STO）衬底上由铁磁性La0.7Sr0.3MnO3 （LSMO）和顺磁性LaNiO3 （LNO）组成的外延生长双层膜的磁性能。研究发现，双层异质结构的堆叠顺序对界面耦合强度起关键作用，LSMO（上）/LNO（下）界面的耦合比LNO（上）/LSMO（下）界面的耦合强得多。此外，在LSMO/LNO界面上观察到一个强自旋玻璃态，两个事实进一步证实了这一点：一是不可逆温度与冷却磁场的依赖关系遵循Almeida-Thouless线；二是热残余磁化的弛豫可以用拉伸指数函数拟合。有趣的是，我们还发现LSMO/LNO双分子层在自旋玻璃冻结温度以下存在交换偏置效应，表明交换偏置与其界面处的自旋玻璃状态密切相关。
We study the magnetic properties of an epitaxial growth bilayer composed of ferromagnetic La0.7Sr0.3MnO3 (LSMO) and paramagnetic LaNiO3 (LNO) on SrTiO3 (STO) substrates. We find that the stack order of the bilayer heterostructure plays a key role in the interfacial coupling strength, and the coupling at the LSMO(top)/LNO(bottom) interface is much stronger than that at the LNO(top)/LSMO(bottom). Moreover, a strong spin glass state has been observed at the LSMO/LNO interface, which is further confirmed by two facts: first, that the dependence of the irreversible temperature on the cooling magnetic field follows the Almeida-Thouless line and, second, that the relaxation of the thermal remnant magnetization can be fitted by a stretched exponential function. Interestingly, we also find an exchange bias effect at the LSMO/LNO bilayer below the spin glass freezing temperature, indicating that the exchange bias is strongly correlated with the spin glass state at its interface.