Magnetic vortex stability in Ni80Fe20 split rings
Magnetic vortex stability in Ni80Fe20 split rings
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DOI：
10.1063/1.4789316
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发表时间：
2013-01-28
影响因子：
3.2
通讯作者：
Barnes, C. H. W.
中科院分区：
文献类型：
--
作者：
Holmes, S. N.;Lee, J. H.;Barnes, C. H. W.
利用300K和1.7K下的磁阻测量对一系列具有两个纳米尺寸间隙的Ni80Fe20环结构的涡旋态磁场持续时间进行了量化。测得的带隙尺寸从40 nm到510 nm。涡旋磁场的稳定范围随着间隙尺寸的增大而减小，但随后趋于稳定，并主要由非本征磁化壁钉扎缺陷决定。与连续环相比，具有平行于间隙的外加磁场方向的虚拟磁畴壁介导的开关减少了这些结构中的随机开关行为。将实验结果与微磁模拟预测的开关行为进行了比较，并计算了剩余涡旋状态下的杂散场。当间隙尺寸接近100 nm时，涡旋场持续时间随间隙尺寸的增大而减小，比微磁模拟预测的结果更为平缓。(C)2013年美国物理研究所。[http://dx.doi.ORG/10.1063/1.4789316]
Magnetoresistance measurements at 300K and 1.7K are used to quantify the vortex state magnetic field duration in a series of Ni80Fe20 ring structures with two nm-sized gaps. The measured gap sizes are from 40 nm to 510 nm. The vortex magnetic field range of stability reduces on increasing gap size but then stabilizes and is predominantly determined by extrinsic domain wall pinning defects. Virtual domain wall mediated switching with the applied magnetic field direction parallel to the gap, reduces a stochastic switching behavior in these structures, compared to a continuous ring. A comparison of experiment with the predicted switching behavior from a micro-magnetic simulation is made and the stray fields are calculated in the vortex remanent state. The reduction in the vortex field duration with increasing gap size is more gradual than that predicted by the micro-magnetic simulation up to a gap size of similar to 100 nm. (C) 2013 American Institute of Physics. [http://dx.doi. org/10.1063/1.4789316]