Abstract
By micromagnetic simulations, we study the current-driven 360° domain wall (360DW) motion in ferromagnetic nanostripe with an in-plane biaxial anisotropy. We observe the critical annihilation current of 360° domain wall can be enhanced through such a type of anisotropy, the reason of which is the suppression of out-of-plane magnetic moments generated simultaneously with domain-wall motion. In details, We have found that the domain-wall width is only related to Ky − Kx, with Kx(y) the anisotropy constant in x(y) direction. Taking domain-wall width into consideration, a prior choice is to keep Ky ≈ Kx with large enough K. The mode of domain-wall motion has been investigated as well. The traveling-wave-motion region increases with K, while the average DW velocity is almost unchanged. Another noteworthy feature is that a Walker-breakdown-like motion exists before annihilation. In this region, though domain wall moves with an oscillating behavior, the average velocity does not reduce dramatically, but even rise again for a large K.
Highlights
Current-induced domain wall (DW) motion, which has potential application to the generation data storage[1] and logic devices[2], has attracted much interest in recent years
360° domain wall (360DW), which is formed by the combination of two transverse domain wall (TDW) with opposite orientations, has attracted much attention[15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33]
360DW may move along a magnetic stripe like TDW under a small driven current, but it will annihilate when the driven current is above a critical value uc[18,26,33]
Summary
The oscillation results in the poor linearity of 〈v〉 − u characteristic in the range of u > 81 m/s (shown in Fig. 2(b)), presenting a Walker-breakdown behavior. As for Ky > Kx, i.e., the upper left part of Fig. 7, the width increases rapidly from 155 nm to 280 nm, corresponding Ky = Kx to Ky − Kx = 40 KJ/m3 Besides these regions, 360DW becomes unstable in our simulations, which corresponds to the white area in the contour plot. A prior solution is to keep Ky ≈ Kx with a possibly largest Kx
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