...
首页> 外文期刊>Physical review >Thermal effects in spin-torque assisted domain wall depinning
【24h】

Thermal effects in spin-torque assisted domain wall depinning

机译:自旋扭矩辅助畴壁脱钉中的热效应

获取原文
获取原文并翻译 | 示例
           

摘要

We have investigated the magnetization reversal in V-shaped permalloy (Py) nanowires under high dc currents via anisotropic magnetoresistance (AMR) measurements. Utilizing a diamond substrate as heat sink, current densities up to 2 × 10~(12) A/m~2 can be applied. These high current densities enabled us to observe spin-torque assisted switching in thermal equilibrium, without the influence of transient effects. At high currents, the field driven magnetization reversal process is influenced by Joule heating, Oersted fields, and spin-torque effects. These contributions can be identified in our experiment due to their different symmetry properties under magnetization and current reversal. We obtain two important results when evaluating the spin-torque efficiency ∈, which is proportional to the nonadiabaticity parameter β. First, we find different values for ∈ within the same sample, obtained with just a slight variation of the experimental parameters. Second, within the temperature range of 77 to 327 K, ∈ is found to be constant.
机译:我们已经通过各向异性磁阻(AMR)测量研究了在高dc电流下V型坡莫合金(Py)纳米线的磁化反转。利用金刚石基板作为散热片,可以施加高达2×10〜(12)A / m〜2的电流密度。这些高电流密度使我们能够观察自旋转矩辅助的热平衡切换,而不受瞬态效应的影响。在大电流下,磁场驱动的磁化反转过程受焦耳热,奥斯特场和自旋转矩效应的影响。这些贡献可以在我们的实验中确定,因为它们在磁化和电流反转下具有不同的对称性。在评估自旋转矩效率ε时,我们获得了两个重要结果,它们与非绝热参数β成正比。首先,我们发现在同一样本中ε的不同值,只是通过稍微改变实验参数即可获得。其次,在77至327K的温度范围内,发现ε是恒定的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号