Current-induced domain wall motion in permalloy nanowires with a rectangular cross-section
Current-induced domain wall motion in permalloy nanowires with a rectangular cross-section
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DOI：
10.1063/1.3658219
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发表时间：
2011-11
影响因子：
3.2
通讯作者：
J. Ai;B. Miao;Li Sun;B. You;A. Hu;H. Ding
中科院分区：
文献类型：
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作者：
J. Ai;B. Miao;Li Sun;B. You;A. Hu;H. Ding
我们对矩形截面坡莫合金纳米线的电流诱导畴壁运动进行了微磁学模拟。在没有非绝热自旋转移项的情况下，需要阈值电流Jc来驱动畴壁连续移动。我们发现，Jc与退磁场和畴壁磁化方向的最大叉积以及畴壁宽度成正比。随着改变的线的厚度和宽度，在106 A/cm 2的数量级的最小阈值电流时，厚度是相当于线的宽度。当电流远大于步行者极限Jw时，计算的畴壁速度ν等于绝热自旋转移速度u。低于Jw时，ν = β α u，其中β是非绝热参数，α是阻尼因子。对于不同的β，我们发现步行者极限可以标度为Jw = α| β-α| JC.模拟结果与一维解析计算结果吻合较好，表明该方法是可行的。
We performed micromagnetic simulations of the current-induced domain wall motion in permalloy nanowires with rectangular cross-section. In the absence of the nonadiabatic spin-transfer term, a threshold current, Jc is required to drive the domain wall moving continuously. We find that Jc is proportional to the maximum cross product of the demagnetization field and magnetization orientation of the domain wall and the domain wall width. With varying both the wire thickness and width, a minimum threshold current in the order of 106 A/cm2 is obtained when the thickness is equivalent to the wire width. With the nonadiabatic spin-transfer term, the calculated domain wall velocity ν equals to the adiabatic spin transfer velocity u when the current is far above the Walker limit Jw. Below Jw, ν=βαu, where β is the nonadiabatic parameter and α is the damping factor. For different β, we find the Walker limit can be scaled as Jw=α|β-α|Jc. Our simulations agree well with the one dimensional analytical calculation, sug...