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Magnetoresistance and magnetization reversal of single Co nanowires

机译：单个Co纳米线的磁阻和磁化反转

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摘要

The magnetization reversal in Co single wires was investigated through magnetoresistance measurements and micromagnetic simulations. We developed a model to calculate the magnetoresistance based on the magnetization structure obtained by the solution of the Landau-Lifshitz-Gilbert equation. It allowed us to understand details of the magnetoresistance curves, including the jumps that are related to the magnetization reversal process. Depending on the angle between the wire and the applied magnetic field, simulations show that the magnetization structure exhibits curling or uniform rotation modes in the magnetization reversal process. In the curling mode, the magnetization structure exhibits a vortex along the wire with its core displaced from the wire axis. For angles larger than 50° the vortex core is close to the wire surface and disappears at 80°, changing the mode from curling to uniform rotation. Our model for computing the magnetoresistance revealed to be a useful tool in the understanding of magnetic properties of nanostructures.
机译：通过磁阻测量和微磁模拟研究了Co单线中的磁化反转。我们开发了一个模型，该模型基于通过Landau-Lifshitz-Gilbert方程的解获得的磁化结构来计算磁阻。它使我们能够了解磁阻曲线的详细信息，包括与磁化反转过程相关的跃迁。根据导线和施加的磁场之间的角度，模拟显示，磁化结构在磁化反转过程中呈现卷曲或均匀旋转模式。在卷曲模式下，磁化结构沿线呈现涡流，其芯线偏离线轴。对于大于50°的角度，涡旋芯靠近金属丝表面，并在80°时消失，从而将模式从卷曲更改为均匀旋转。我们的计算磁阻的模型显示出对于理解纳米结构的磁性能是有用的工具。

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  • 来源
    《Physical review》 |2009年第13期|651-656|共6页
  • 作者

    R. A. Silva; T. S. Machado; G. Cernicchiaro; A. P. Guimaraes; L. C. Sampaio;

  • 作者单位

    Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ, Brazil;

    Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ, Brazil;

    Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ, Brazil;

    Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ, Brazil;

    Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud, 150, Rio de Janeiro 22.290-180, RJ, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    domain effects; magnetization curves; and hysteresis;

    机译：领域效应;磁化曲线和滞后;

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