Spatially reconfigurable antiferromagnetic states in topologically rich free-standing nanomembranes
Spatially reconfigurable antiferromagnetic states in topologically rich free-standing nanomembranes
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DOI：
10.1038/s41563-024-01806-2
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发表时间：
2024-02
期刊：
影响因子：
41.2
通讯作者：
H. Jani;Jack Harrison;S. Hooda;S. Prakash;Proloy Nandi;Junxiong Hu;Zhiyang Zeng;Jheng-Cyuan Lin;Charles Godfrey;G. J. Omar;Tim A Butcher;Jörg Raabe;S. Finizio;A. Thean;A. Ariando;Paolo G Radaelli
中科院分区：
文献类型：
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作者：
H. Jani;Jack Harrison;S. Hooda;S. Prakash;Proloy Nandi;Junxiong Hu;Zhiyang Zeng;Jheng-Cyuan Lin;Charles Godfrey;G. J. Omar;Tim A Butcher;Jörg Raabe;S. Finizio;A. Thean;A. Ariando;Paolo G Radaelli
承载实空间拓扑结构的反铁磁体是模拟基本超快现象和探索自旋电子学的有希望的平台。然而，它们只能在特定的对称匹配衬底上外延制造，从而保持其固有的磁晶顺序。这限制了它们与不同支持的结合，限制了基础和应用研究的范围。本文通过设计可分离的α-Fe2O3晶体反铁磁纳米膜来克服这一限制。首先，我们通过基于传输的反铁磁矢量映射显示，平面纳米膜具有自旋定向转变和丰富的拓扑现象学。其次，我们利用它们的极端灵活性来证明由挠曲诱导的应变引起的三维膜折叠的反铁磁性态的重新配置。最后，我们将这些研究成果结合起来，利用可控机械臂实现了在室温下应变驱动的非热生成拓扑织构。这种独立的反铁磁层与平面/弯曲纳米结构的集成可以通过准静态和动态状态下的磁弹性/几何效应来实现自旋纹理设计，为曲线反铁磁和非常规计算开辟了新的探索。
Antiferromagnets hosting real-space topological textures are promising platforms to model fundamental ultrafast phenomena and explore spintronics. However, they have only been epitaxially fabricated on specific symmetry-matched substrates, thereby preserving their intrinsic magneto-crystalline order. This curtails their integration with dissimilar supports, restricting the scope of fundamental and applied investigations. Here we circumvent this limitation by designing detachable crystalline antiferromagnetic nanomembranes of α-Fe2O3. First, we show—via transmission-based antiferromagnetic vector mapping—that flat nanomembranes host a spin-reorientation transition and rich topological phenomenology. Second, we exploit their extreme flexibility to demonstrate the reconfiguration of antiferromagnetic states across three-dimensional membrane folds resulting from flexure-induced strains. Finally, we combine these developments using a controlled manipulator to realize the strain-driven non-thermal generation of topological textures at room temperature. The integration of such free-standing antiferromagnetic layers with flat/curved nanostructures could enable spin texture designs via magnetoelastic/geometric effects in the quasi-static and dynamical regimes, opening new explorations into curvilinear antiferromagnetism and unconventional computing.