Ir20Mn80/Pt异质结构自旋轨道转矩电检测的挑战

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2023-09-20 DOI:10.3233/jae-220298
Ilkin Goksal, Hasan Piskin, Bayram Kocaman, Kutay Akın, Dogukan Cay, Ege Selvi, Vedat Karakas, Sergi Lendinez, Hilal Saglam, Yi Li, John E. Pearson, Ralu Divan, Wei Zhang, Valentine Novosad, Axel Hoffmann, Ozhan Ozatay
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引用次数: 0

摘要

反铁磁亚晶格取向的控制是自旋电子器件应用中的一个关键挑战,需要非常规的方法,如电流感应扭矩,包括自旋转移扭矩(STT)和自旋轨道扭矩(SOT)。为了观察nsamel矢量与各向异性轴的偏差,最简单的方法之一是电检测,即监测电阻的变化作为施加电流的函数。在这项工作中,我们通过研究反铁磁金属(Ir20Mn80)/重金属(Pt)超晶格中的反铁磁层结构和厚度依赖关系,研究了超薄金属反铁磁Ir20Mn80易受SOT效应影响的条件。我们的电学测量表明,在双层结构中,存在一个较浅的Ir20Mn80厚度范围(~ 1-2 nm), SOT驱动的自旋控制是明显的,而对于较低厚度的不完全亚晶格形成和较高厚度的改进热稳定性阻止了自旋电流的易感。此外,在多层结构中,Ir20Mn80层的结构变化由于更强的磁晶各向异性而淬灭了局部力矩。这些结果表明,反铁磁体参数的彻底优化对于成功部署自旋电子器件至关重要。
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Challenges in electrical detection of spin-orbit torque in Ir20Mn80/Pt hetero-structures
Manipulation of antiferromagnetic sublattice orientations, a key challenge in spintronic device applications, requires unconventional methods such as current induced torques including Spin Transfer Torque (STT) and Spin-Orbit Torque (SOT). In order to observe the deviation of the Néel vector from the anisotropy axis, one of the simplest approaches is the electrical detection, whereby one monitors the change in resistance as a function of applied current. In this work, we have investigated the conditions under which an ultra-thin metallic antiferromagnet, Ir20Mn80 becomes susceptible to SOT effects by studying antiferromagnetic layer structure and thickness dependence in antiferromagnetic metal (Ir20Mn80)/heavy metal (Pt) superlattices. Our electrical measurements reveal that in bilayer structures there exists a shallow range of Ir20Mn80 thicknesses (∼1–2 nm) for which SOT driven control of spins is apparent, whereas for lower thicknesses incomplete sublattice formation and for higher thicknesses improved thermal stability prohibits vulnerability to spin currents. Furthermore, in multilayers, structural changes in Ir20Mn80 layer quenches local torques due to stronger (111) magnetocrystalline anisotropy. These results suggest that an exhaustive optimization of the antiferromagnet parameters is crucial for the successful deployment of spintronic devices.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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