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Nanoscale structure of the magnetic induction at monopole defects in artificial spin-ice lattices

机译:人工自旋冰晶格中单极缺陷处磁感应的纳米结构

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摘要

Artificially frustrated spin-ice systems are of considerable interest since they simulate the spin frustration and concomitant rich behavior exhibited by atoms on a crystal lattice in naturally occurring spin-ice systems such as pyrochlores. As a result of the magnetic frustration, these systems can exhibit "magnetic monopole" type defects, which are an example of an exotic emergent quasiparticle. The local magnetization structure of such monopole defects determines their stability and thus is critical to understanding their behavior. In this paper, we report on the direct observation at room temperature of the nanoscale magnetic structure of individual magnetic monopoles in an artificially frustrated two-dimensional square spin-ice lattice, using high-resolution aberration-corrected Lorentz transmission electron microscopy. By combining the high-resolution microscopy with micromagnetic simulation, we demonstrate how nucleation of defect strings, reminiscent of Dirac strings, connecting monopole defects controls the demagnetization process in these spin-ice lattices.
机译:人工挫败的自旋冰系统备受关注,因为它们模拟了自然存在的自旋冰系统(如烧绿石)中晶格上原子所表现出的自旋失意和伴随的丰富行为。由于磁阻,这些系统会表现出“磁单极”型缺陷,这是外来的准准粒子的一个例子。这种单极缺陷的局部磁化结构决定了它们的稳定性,因此对于理解其行为至关重要。在本文中,我们报告了使用高分辨率像差校正的洛伦兹透射电子显微镜,在室温下对人工受挫的二维正方形自旋冰晶格中单个磁单极子的纳米级磁性结构的直接观察。通过将高分辨率显微镜与微磁模拟相结合,我们证明了缺陷串的成核如何使人联想到狄拉克弦,连接单极缺陷如何控制了这些自旋冰晶格中的消磁过程。

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  • 来源
    《Physical review》 |2011年第17期|p.174431.1-174431.5|共5页
  • 作者单位

    Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA;

    Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA,Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208, USA;

    Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA,Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3112, USA;

    National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA;

    Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    magnetization reversal mechanisms; magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields;

    机译:磁化反转机制;磁电子学自旋电子学:利用自旋极化传输或集成磁场的设备;

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