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Chiral modulations and reorientation effects in MnSi thin films

机译:MnSi薄膜中的手性调制和重定向效应

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摘要

We present an experimental and theoretical investigation of the influence of a uniaxial magnetocrystalline anisotropy on the magnetic textures that are formed in a chiral magnetic system. We show that the epitaxially induced tensile stress in MnSi thin films grown on Si( 111) creates an easy-plane uniaxial anisotropy. The magnetoelastic shear stress coefficient is derived from SQUID magnetometry measurements in combination with transmission electron microscopy and x-ray diffraction data. Density functional calculations of the magnetoelastic coefficient support the conclusion that the uniaxial anisotropy originates from the magnetoelastic coupling. Theoretical calculations based on a Dzyaloshinskii model that includes an easy-plane anisotropy predict a variety of modulations to the magnetic order that are not observed in bulk MnSi crystals. Evidence for these states is found in the magnetic hysteresis and polarized neutron reflectometry measurements.
机译:我们提出了单轴磁晶各向异性对在手性磁系统中形成的磁织构的影响的实验和理论研究。我们表明,在Si(111)上生长的MnSi薄膜中,外延引起的拉伸应力产生了易平面的单轴各向异性。磁弹性剪切应力系数是从SQUID磁力测量与透射电子显微镜和X射线衍射数据结合得出的。磁弹性系数的密度泛函计算支持以下结论:单轴各向异性源自磁弹性耦合。基于Dzyaloshinskii模型的理论计算(包括易平面各向异性)预测了在块状MnSi晶体中未观察到的对磁序的各种调制。在磁滞和极化中子反射法测量中可以找到这些状态的证据。

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  • 来源
    《Physical review》 |2012年第9期|p.094429.1-094429.12|共12页
  • 作者单位

    Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5;

    Institut fuer Festkoerper- und Werkstofjforschung, IFW Dresden, Postfach 270016, D-01171 Dresden, Germany;

    Institut fuer Festkoerper- und Werkstofjforschung, IFW Dresden, Postfach 270016, D-01171 Dresden, Germany;

    Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5;

    Center for Neutron Research, N1ST, Gaithersburg Maryland 20899, USA;

    National Research Council Canada, Canadian Neutron Beam Centre, Chalk River, Ontario, Canada K0J JJ0;

    Department of Physics, Acadia University, Wolfville, Nova Scotia, Canada B4P 2R6;

    Center for Neutron Research, N1ST, Gaithersburg Maryland 20899, USA;

    Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5;

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  • 正文语种 eng
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  • 关键词

    intrinsic properties of magnetically ordered materials; magnetic properties of monolayers and thin films;

    机译:磁性有序材料的固有特性;单层和薄膜的磁性;

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