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Antiferromagnetic half-sky rmions and bimerons at room temperature

机译：在室温下反铁磁性半天的半天rmion和双子

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摘要

In the quest for post-CMOS (complementary metal-oxide-semiconductor) technologies, driven by the need for improved efficiency and performance, topologically protected ferromagnetic 'whirls' such as skyrmions~(1-8)and their anti-particles have shown great promise as solitonic information carriers in racetrack memory-in-logic or neuromorphic devices~(1,9-11). However, the presence of dipolar fields in ferromagnets, which restricts the formation of ultrasmall topological textures~(3,6,8,9,12), and the deleterious skyrmion Hall effect, when skyrmions are driven by spin torques~(9,10,12), have thus far inhibited their practical implementation. Antiferromagnetic analogues, which are predicted to demonstrate relativistic dynamics, fast deflection-free motion and size scaling, have recently become the subject of intense focus~(9,13-19), but they have yet to be experimentally demonstrated in natural antiferromagnetic systems. Here we realize a family of topological antiferromagnetic spin textures in α-Fe_(2)O_(3)-an Earth-abundant oxide insulator-capped with a platinum overlayer. By exploiting a first-order analogue of the Kibble-Zurek mechanism~(20,21), we stabilize exotic merons and antimerons (half-skyrmions)~(8)and their pairs (bimerons)~(16,22), which can be erased by magnetic fields and regenerated by temperature cycling. These structures have characteristic sizes of the order of 100 nanometres and can be chemically controlled via precise tuning of the exchange and anisotropy, with pathways through which further scaling may be achieved. Driven by current-based spin torques from the heavy-metal overlayer, some of these antiferromagnetic textures could emerge as prime candidates for low-energy antiferromagnetic spintronics at room temperature~(1,9-11,23).
机译：在寻求CMOS（互补金属 - 氧化物半导体）技术的过程中，通过提高效率和性能的需求，拓扑保护的铁磁性“旋转”，如臭氧〜（1-8），它们的抗粒子表现出很好承诺作为跑车内存逻辑或神经形态器件中的孤子信息载体〜（1,9-11）。然而，在铁圆形仪中存在偶极字段，限制超大拓扑纹理的形成〜（3,6,8,9,12），以及斯通扭矩驱动时的有害斯基尔霍尔疗效〜（9,10 12），迄今为止抑制了他们的实际实施。反铁磁性类似物预测展示相对论动态，快速偏转运动和尺寸缩放，最近成为激烈的重点〜（9,13-19）的主题，但它们尚未在天然反铁磁系统中进行实验证明。在这里，我们实现了α-Fe_（2）O_（3）中的拓扑反铁磁性旋转纹理系列 - 用铂叠层覆盖土堆氧化物绝缘体。通过利用kibble-zurek机制的一阶模拟〜（20,21），我们稳定异国情调的Muroon和Antimerons（半噬菌体）〜（8）及其对（双子）〜（16,22）被磁场擦除并通过温度循环再生。这些结构具有100纳米的特征尺寸，可以通过精确调谐的交换和各向异性的精制调节，具有进一步缩放的通路。由来自重金属覆盖器的电流基旋转扭矩驱动，其中一些防冻纹理可以在室温下作为低能量反铁磁性熔点的主要候选者出现〜（1,9-11,23）。

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  • 来源
    《Nature》 |2021年第7844期|74-79|共6页
  • 作者

    Hariom Jani; Jheng-Cyuan Lin; Jiahao Chen; Jack Harrison; Francesco Maccherozzi; Jonathon Schad; Saurav Prakash; Chang-Beom Eom; A Ariando; T Venkatesan; Paolo G Radaelli;

  • 作者单位

    Department of Physics National University of Singapore;

    Clarendon Laboratory Department of Physics University of Oxford;

    Clarendon Laboratory Department of Physics University of Oxford;

    Clarendon Laboratory Department of Physics University of Oxford;

    Diamond Light Source Harwell Science and Innovation Campus;

    Department of Materials Science and Engineering University of Wisconsin-Madison;

    Department of Physics National University of Singapore;

    Department of Materials Science and Engineering University of Wisconsin-Madison;

    Department of Physics National University of Singapore|NUS Graduate School for Integrative Sciences and Engineering National University of Singapore;

    Department of Electrical and Computer Engineering National University of Singapore;

    Clarendon Laboratory Department of Physics University of Oxford;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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