Insights into the role of magnetoelastic anisotropy in the magnetization reorientation of magnetic nanowires
Insights into the role of magnetoelastic anisotropy in the magnetization reorientation of magnetic nanowires
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DOI：
10.1103/physrevb.84.014410
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发表时间：
2011-07-21
影响因子：
3.7
通讯作者：
Araujo, J. P.
中科院分区：
文献类型：
--
作者：
Leitao, D. C.;Ventura, J.;Araujo, J. P.
了解磁性纳米线（NWs）的物理性质对其潜在的技术应用至关重要。在本文中，我们详细研究了在阳极氧化铝模板上生长的Ni和nfe NWs的磁性[M(T)]和磁输运[MR(T)]性质的温度依赖性。nfe NWs表现出强烈的形状各向异性，而Ni NWs表现出异常的M(T)和MR(T)。与预期的M(T)和MR(T)行为的偏差表明，随着温度的降低，磁化易轴发生了重定向。然后，我们提取了磁化与NW纵轴之间的角度的温度变化，发现从370 K时的0度增加到5 K时的43度。使用四阶磁各向异性能量模型，我们能够成功地解释我们的结果，并表明由于NWs中作用的压应力导致的磁弹性各向异性的存在是观测到的磁化重定向的主要来源。
Understanding the physical properties of magnetic nanowires (NWs) is of crucial importance due to their potential technological applications. In this paper we report a detailed study on the temperature dependence of the magnetic [M(T)] and magnetotransport [MR(T)] properties of Ni and NiFe NWs grown on anodic aluminum oxide templates. While the behavior of the NiFe NWs reflected the presence of a strong shape anisotropy, Ni NWs showed anomalous M(T) and MR(T). The deviations from the expected M(T) and MR(T) behaviors suggest a reorientation of the magnetization easy axis with decreasing temperature. We then extracted the temperature variation of the angle between the magnetization and the NW longitudinal axis, and found an increase from 0 degrees at 370 K to similar to 43 degrees at 5 K. Using a fourth-order magnetic anisotropy energy model we were able to successfully explain our results and show that the presence of a magnetoelastic anisotropy contribution due to the compressive stress acting in the NWs is the main origin of the observed magnetization reorientation.