SrRuO3-PrMnO3超晶格中对称性破坏对层间交换耦合和电导的影响,Advanced Materials Interfaces

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SrRuO3-PrMnO3超晶格中对称性破坏对层间交换耦合和电导的影响
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-08-20 , DOI: 10.1002/admi.201800913
Antarjami Sahoo ₁ , Wilfrid Prellier ₂ , Prahallad Padhan ₁

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通过增加由两个铁磁体SrRuO ₃ 和PrMnO ₃组成的超晶格中的PrMnO ₃层厚度，可以实现正交晶向四方晶体对称性的破坏。八面体旋转图案是⁺ Ç ^- Ç ^-和⁰一⁰ Ç ^-类型具有正交和四方晶相，分别超晶格，在状态的模拟投影密度推断。15％的减少在轨道占用由于一个⁰一个⁰ Ç ^-型八面体旋转相比于一个的⁺ Ç ^- $骨灰盒：x-wiley：21967350：media：admi201800913：admi201800913-math-0001$ ç ^-类型表明存在较强的反铁磁（AFM）耦合。较大的轨道交叠会导致更强的自旋-轨道耦合，伴随着正交正交超晶格中沿磁化轴移动的次平面内场致冷（FC）磁滞回线（M（H））的42.8％移位。同时，由于四边形超晶格中强大的AFM耦合，较小的面内FC M（H）沿场轴移动。在取决于磁场的磁阻中，反铁磁耦合界面层中的自旋旋转被检测为一个独特的异常，在偏斜自旋和四方对称的超晶格中，自旋比钉扎自旋和正交正交性更强。

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Effect of Symmetry Breaking on Interlayer Exchange Coupling and Electrical Conduction in SrRuO3–PrMnO3 Superlattices

The breaking of orthorhombic to tetragonal crystal symmetry is realized by increasing the PrMnO₃ layer thickness in the superlattices consisting two ferromagnets, SrRuO₃ and PrMnO₃. The octahedral rotation pattern is a⁺c⁻c⁻ and a⁰a⁰c⁻ type for the superlattices with orthorhombic and tetragonal phase, respectively, inferred in the simulated projected density of states. The 15% reduction in $urn:x-wiley:21967350:media:admi201800913:admi201800913-math-0001$ orbital occupancy due to the a⁰a⁰c⁻ type octahedral rotation compared to that of the a⁺c⁻c⁻ type suggests the presence of stronger antiferromagnetic (AFM) coupling. The larger orbital overlapping leads to a stronger spin–orbit coupling, associated with a shift of 42.8% of the minor in‐plane field cooled (FC) magnetic hysteresis loop(M(H)) along the magnetization axis in orthorhombic superlattices. While, minor in‐plane FC M(H) shifts along the field axis due to the strong AFM coupling in tetragonal superlattices. In field‐dependent magnetoresistance, the rotation of spins in the antiferromagnetically coupled interfacial layers is detected as a unique anomaly, which is stronger in the superlattices for the biased spins and tetragonal symmetry than the pinned spins and orthorhombic symmetry. The results demonstrate that the tuning of interfacial exchange coupling and spin‐dependent transport by controlling structural distortion could be used as a tool in fabricating modern spintronics‐based devices.

更新日期：2018-08-20

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