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Order and disorder in the magnetization of the chiral crystal CrNb_3S_6

机译：手性晶体CrNb_3S_6的磁化有序和无序

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摘要

Competing magnetic anisotropies in chiral crystals with Dzyaloshinskii-Moriya exchange interactions can give rise to nontrivial chiral topological magnetization configurations with new and interesting properties. One such configuration is the magnetic soliton, where the moment continuously rotates about an axis. This magnetic system can be considered to be one dimensional and, because of this, it supports a macroscale coherent magnetization, giving rise to a tunable chiral soliton lattice (CSL) that is of potential use in a number of applications in nanomagnetism and spintronics. In this paper, we characterize the transitions between the forced-ferromagnetic (F-FM) phase and the CSL one in CrNb3S6 using differential phase contrast imaging in a scanning transmission electron microscope, conventional Fresnel imaging, ferromagnetic resonance spectroscopy, and mean-field modeling. We find that the formation and movement of dislocations mediate the formation of CSL and F-FM regions and that these strongly influence the highly hysteretic static and dynamic properties of the system. Sample size and morphology can be used to tailor the properties of the system and, with the application of magnetic field, to locate and stabilize normally unstable dislocations and modify their dimensions and magnetic configurations in ways beyond that predicted to occur in uniform films.
机译：具有Dzyaloshinskii-Moriya交换相互作用的手性晶体中的竞争性磁各向异性可以产生具有新奇有趣特性的非平凡手性拓扑磁化构型。一种这样的配置是磁孤子，其中矩绕轴连续旋转。可以认为该磁性系统是一维的，因此，它支持宏观相干磁化，从而产生了可调谐的手性孤子晶格（CSL），可在纳米磁性和自旋电子学的许多应用中潜在使用。在本文中，我们使用扫描透射电子显微镜中的差分相衬成像，常规菲涅耳成像，铁磁共振光谱和均场建模来表征CrNb3S6中强迫铁磁（F-FM）相和CSL相之间的跃迁。 。我们发现位错的形成和运动介导了CSL和F-FM区域的形成，并且这些强烈影响了系统的高滞后静态和动态特性。样品的大小和形态可用于调整系统的性能，并通过施加磁场来定位和稳定通常不稳定的位错，并以超出预期在均匀膜中发生的方式改变其尺寸和磁构型。

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  • 来源
    《Physical review》 |2019年第22期|224429.1-224429.11|共11页
  • 作者

    Paterson Gary W.; Koyama Tsukasa; Shinozaki Misako; Masaki Yusuke; Goncalves Francisco J. T.; Shimamoto Yusuke; Sogo Tadayuki; Nord Magnus; Kousaka Yusuke; Kato Yusuke; Mc Vitie Stephen; Togawa Yoshihiko;

  • 作者单位

    Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland;

    Osaka Prefecture Univ, Dept Mat Sci, Sakai, Osaka 5998531, Japan;

    Univ Tokyo, Dept Basic Sci, Meguro, Tokyo 1538902, Japan;

    Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan;

    Osaka Prefecture Univ, Dept Phys & Elect, 1-1 Gakuencho, Sakai, Osaka 5998531, Japan;

    Osaka Prefecture Univ, Dept Phys & Elect, 1-1 Gakuencho, Sakai, Osaka 5998531, Japan;

    Osaka Prefecture Univ, Dept Phys & Elect, 1-1 Gakuencho, Sakai, Osaka 5998531, Japan;

    Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland;

    Osaka Prefecture Univ, Dept Phys & Elect, 1-1 Gakuencho, Sakai, Osaka 5998531, Japan|Okayama Univ, Res Inst Interdisciplinary Sci, Okayama, Okayama 7008530, Japan|Hiroshima Univ, Ctr Chiral Sci, Higashihiroshima, Hiroshima 7398526, Japan;

    Univ Tokyo, Dept Basic Sci, Meguro, Tokyo 1538902, Japan;

    Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland;

    Osaka Prefecture Univ, Dept Phys & Elect, 1-1 Gakuencho, Sakai, Osaka 5998531, Japan|Hiroshima Univ, Chiral Res Ctr CResCent, Higashihiroshima, Hiroshima 7398526, Japan;

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