Magnon dispersion in thin magnetic films
Magnon dispersion in thin magnetic films
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DOI：
10.1088/0953-8984/26/39/394007
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
T. Balashov;P. Buczek;L. Sandratskii;Arthur Ernst;Arthur Ernst;W. Wulfhekel
中科院分区：
文献类型：
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作者：
T. Balashov;P. Buczek;L. Sandratskii;Arthur Ernst;Arthur Ernst;W. Wulfhekel
虽然磁振子的色散已经在许多大块材料中测量，但很少有研究涉及当材料处于薄膜形式时色散的变化，薄膜是一种对应用感兴趣的系统。本文综述了Mn/Cu 3Au（1 0 0）中磁振子色散的非弹性隧穿谱研究，并介绍了Cu（1 0 0）上Co和Ni薄膜的最新研究。Mn和Co膜中的分散紧密地遵循体样品的分散，其对厚度的依赖性可以忽略不计。磁振子的寿命与膜厚关系不大，随磁振子能量的增加而显著减小。在Ni/Cu（1 0 0）薄膜中，色散的厚度依赖性更为明显。测量结果表明，一个相当大的模式软化较薄的薄膜。磁振子寿命急剧下降的边缘附近的布里渊区由于一个紧密接近的Stoner连续。实验研究得到了第一性原理计算的支持。
Although the dispersion of magnons has been measured in many bulk materials, few studies deal with the changes in the dispersion when the material is in the form of a thin film, a system that is of interest for applications. Here we review inelastic tunneling spectroscopy studies of magnon dispersion in Mn/Cu3Au(1 0 0) and present new studies on Co and Ni thin films on Cu(1 0 0). The dispersion in Mn and Co films closely follows the dispersion of bulk samples with negligible dependence on thickness. The lifetime of magnons depends slightly on film thickness, and decreases considerably as the magnon energy increases. In Ni/Cu(1 0 0) films the thickness dependence of dispersion is much more pronounced. The measurements indicate a considerable mode softening for thinner films. Magnon lifetimes decrease dramatically near the edge of the Brillouin zone due to a close proximity of the Stoner continuum. The experimental study is supported by first-principles calculations.