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arXiv 2012.14651cond-mat.mtrl-sci
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CaMnO3/CaIrO3异质结构中双四重对称巨各向异性磁电阻效应

Giant anisotropic magnetoresistance with dual-four-fold symmetry in CaMnO3/CaIrO3 heterostructures

Suman Sardar, Megha Vagadia, Tejas Tank Sarmistha Das, Brandon Gunn, Parul Pandey, R. Hübner, Fanny Rodolakis, Gilberto Fabbris, Yongseong Choi, Daniel Haskel, … 展开作者

Suman Sardar, Megha Vagadia, Tejas Tank Sarmistha Das, Brandon Gunn, Parul Pandey, R. Hübner, Fanny Rodolakis, Gilberto Fabbris, Yongseong Choi, Daniel Haskel, Alex Frano, D. S. Rana

摘要:

在新型3d-5d异质结构中实现四重各向异性磁电阻效应,推动了反铁磁自旋电子学的研究。然而,尽管有可能结合强自旋轨道耦合,但迄今为止只检测到小的AMR信号,这促使人们寻找新的机制来增强信号。在这项研究中,CaMnO 3/CaIrO 3异质结,我们报告了一个独特的双四倍对称70%AMR,信号两个数量级比以前观察到的类似系统。我们发现,一个订单是通过调整一个大的双轴各向异性通过八面体倾斜的组成层中的类似意义上的增强,而第二个订单是由自旋触发器过渡在近莫特型相触发。这两种现象之间的动力学证据的阶梯状AMR和叠加的双轴各向异性诱导AMR捕获一个微妙的相互作用的赝自旋耦合与晶格和外部磁场。我们的研究表明,电荷转移,层间耦合和自旋翻转过渡的组合可以产生一个巨大的AMR相关的传感和反铁磁存储器的应用。

英文摘要:

The realization of four-fold anisotropic magnetoresistance (AMR) in novel 3d-5d heterostructures has boosted major efforts in antiferromagnetic spintronics. However, despite the potential of incorporating strong spin-orbit coupling, only small AMR signals have been detected thus far, prompting a search for new mechanisms to enhance the signal. In this study on CaMnO3/CaIrO3 heterostructures, we report a unique dual-four-fold symmetric 70% AMR; a signal two orders of magnitude larger than previously observed in similar systems. We find that one order is enhanced by tuning a large biaxial anisotropy through octahedral tilts of similar sense in the constituent layers, while the second order is triggered by a spin-flop transition in a nearly Mott-type phase. Dynamics between these two phenomena as evidenced by the step-like AMR and a superimposed biaxial-anisotropy-induced AMR capture a subtle interplay of pseudospin coupling with the lattice and external magnetic field. Our study shows that a combination of charge-transfer, interlayer coupling, and a spin-flop transition can yield a giant AMR relevant for sensing and antiferromagnetic memory applications.

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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