Interfacial Ferromagnetic Coupling and Positive Spontaneous Exchange Bias in SrFeO3–x/La0.7Sr0.3MnO3 Bilayers,ACS Applied Materials & Interfaces

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Interfacial Ferromagnetic Coupling and Positive Spontaneous Exchange Bias in SrFeO3–x/La0.7Sr0.3MnO3 Bilayers
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-07-03 00:00:00 , DOI: 10.1021/acsami.9b07639
Jun Zhang _{1,

2,

3} , Guowei Zhou _{1,

3} , Zhi Yan ₁ , Huihui Ji ₁ , Xiaoli Li _{1,

3} , Zhiyong Quan _{1,

3} , Yuhao Bai ₃ , Xiaohong Xu _{1,

3}

Affiliation

Negative exchange bias is usually discovered in ferromagnetic (FM)/antiferromagnetic (AFM) heterostructures after a field-cooling (FC) process. Relatively, positive exchange bias (PEB) is a rarely observed phenomenon. So far, almost all of the models for PEB whether undergoing FC or zero-field-cooling (ZFC) treatment have been explained by an interaction of strong AFM coupling at the interface. In this work, by selecting a special material of SrFeO_3–x as the AFM layer, coupled with FM-La_0.7Sr_0.3MnO₃ (LSMO), we obtain a novel PEB effect of the bilayer after ZFC measurement, of which the shift directions are unfixable and dependent on the initial magnetization direction. Based on a transient magnetic field to control the remanence (M_r) direction of LSMO at room temperature and then cooling below the T_N of SrFeO_3–x without any magnetic field disturbance, the shift direction can be locked only toward the transient magnetic field. Combined with experimental results and first-principles calculations, we propose that the above phenomena are explained as the field-induced AFM phase of SrFeO_3–x transforming into the FM phase at an FM coupling bilayer interface. Thus, our finding may provide a new approach to realize and tune the zero-field-cooling PEB with FM coupling heterostructures.

中文翻译：

界面铁磁耦合和正自发交换偏置在SrFeO _{3- X} / LA _0.7锶_0.3的MnO ₃双层膜

在场冷却（FC）过程之后，通常会在铁磁（FM）/反铁磁（AFM）异质结构中发现负交换偏压。相对而言，正交换偏差（PEB）是一种很少观察到的现象。到目前为止，几乎所有用于PEB的模型（无论是经过FC还是零场冷却（ZFC）处理）都通过界面处强AFM耦合的相互作用来解释。在这项工作中，通过选择特殊材料SrFeO _{3– x}作为AFM层，再加上FM-La _0.7 Sr _0.3 MnO ₃（LSMO），我们在ZFC测量之后获得了双层的新型PEB效应，其位移方向是不可固定的，并且取决于初始磁化方向。基于瞬态磁场以控制LSMO在室温下的剩磁（M _r）方向，然后冷却至SrFeO _3-_x的T _N以下而不受任何磁场干扰，移动方向只能锁定在瞬态磁场上。结合实验结果和第一性原理计算，我们建议将上述现象解释为SrFeO _3–_x的场致AFM相。在FM耦合双层界面处转换为FM相位。因此，我们的发现可能提供一种新的方法来实现和调谐具有FM耦合异质结构的零场冷却PEB。

更新日期：2019-07-03

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