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Strain‐Induced Interlayer Parallel‐to‐Antiparallel Magnetic Transitions of Twisted Bilayers
Advanced Theory and Simulations ( IF 3.3 ) Pub Date : 2021-01-12 , DOI: 10.1002/adts.202000215
Jian‐Jun Wang 1 , Tian‐Nan Yang 1 , Bo Wang 1 , Mark S. Rzchowski 2 , Chang‐Beom Eom 3 , Long‐Qing Chen 1
Affiliation  

The discovery of superconductivity in twisted graphene bilayers with a magic twisting angle ≈1.1° has opened up a wide range of potential twistronic device possibilities. In this work, the twisting effects in spintronic devices are explored. In particular, a material prototype integrating spintronics, straintronics, and twistronics is developed by stacking a twisted CoFe2O4 (CFO) bilayer membrane on a Pb(Mg1/3Nb2/3)O3‐PbTiO3 (PMN‐PT) membrane. Phase‐field simulations are performed to study the magnetic domain configurations and switching in CFO bilayers under piezostrains. An emerging interlayer parallel‐to‐antiparallel magnetic transition of the twisted CFO bilayer induced by appropriate piezostrain pulses generated from the PMN‐PT membrane is discovered. Such a strain‐induced parallel‐to‐antiparallel magnetic transition is non‐volatile and reversible, arising from the synergistic interaction among spin, strain, and twisting order parameters. The present work provides a paradigm for designing novel spinotropic devices by taking advantage of the emerging phenomena generated by twisting.

中文翻译:

扭曲双层的应变诱导层间平行至反平行磁跃迁

在扭曲扭曲角约为1.1°的扭曲石墨烯双层中发现超导性,为潜在的扭曲器件提供了广泛的可能性。在这项工作中,探索了自旋电子器件中的扭曲效应。特别是,通过将扭曲的CoFe 2 O 4(CFO)双层膜堆叠在Pb(Mg 1/3 Nb 2/3)O 3 -PbTiO 3上,开发出了一种将自旋电子学,应变电子学和反旋电子学集成在一起的材料原型。(PMN-PT)膜。进行相场模拟以研究压电应变下CFO双层中的磁畴配置和转换。发现了由PMN-PT膜产生的适当的压电应变脉冲引起的扭曲的CFO双层的新兴层间平行至反平行磁跃迁。由于自旋,应变和扭曲顺序参数之间的协同相互作用,这种由应变引起的平行到反平行的磁跃迁是非易失性和可逆的。本工作为利用扭转产生的新兴现象提供了设计新型自旋装置的范例。
更新日期:2021-03-09
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