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arXiv 2201.08420cond-mat.mtrl-scicond-mat.mes-hall
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二维VSe $_2$系统的自旋阀效应

Spin valve effect in two-dimensional VSe$_2$ system

M. A. Jafari, M. Wawrzyniak-Adamczewska, S. Stagraczyński, A. Dyrdal, J. Barnaś

摘要:

钒基二硫属化物(VSe $_2$)是一种二维材料,其中磁性钒原子以六方晶格排列并在平面内铁磁耦合。然而,相邻的原子平面是反铁磁耦合的。这为自旋电子学和数据存储与处理技术的应用提供了新的和有趣的机会。当两个原子平面的磁矩被外部磁场驱动成平行排列时,可以实现自旋阀磁阻。与从反平行到平行配置的过渡相关联的电阻变化定性地类似于在人工层状金属磁性结构中观察到的电阻变化。通过密度泛函理论计算得到了VSe $_2$的详细电子结构。然后,弹道自旋阀磁阻内的Landauer形式主义确定。此外,我们还分析了热性能和热电性能。考虑VSe $_2$的两个相位,表示为H和T。

英文摘要:

Vanadium based dichalcogenides, VSe$_2$, are two-dimensional materials in which magnetic Vanadium atoms are arranged in a hexagonal lattice and are coupled ferromagnetically within the plane. However, adjacent atomic planes are coupled antiferromagnetically. This provides new and interesting opportunities for application in spintronics and data storage and processing technologies. A spin valve magnetoresistance may be achieved when magnetic moments of both atomic planes are driven to parallel alignment by an external magnetic field. The resistance change associated with the transition from antiparallel to the parallel configuration is qualitatively similar to that observed in artificially layered metallic magnetic structures. Detailed electronic structure of VSe$_2$ was obtained from DFT calculations. Then, the ballistic spin-valve magnetoresistance was determined within the Landauer formalism. In addition, we also analyze thermal and thermoelectric properties. Both phases of VSe$_2$, denoted as H and T, are considered.

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