Synchronous precessional motion of multiple domain walls in a ferromagnetic nanowire by perpendicular field pulses.
Synchronous precessional motion of multiple domain walls in a ferromagnetic nanowire by perpendicular field pulses.
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DOI：
10.1038/ncomms4429
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发表时间：
2014-03-24
影响因子：
16.6
通讯作者：
Klaeui, Mathias
中科院分区：
文献类型：
--
作者：
Kim, June-Seo;Mawass, Mohamad-Assaad;Bisig, Andre;Krueger, Benjamin;Reeve, Robert M.;Schulz, Tomek;Buettner, Felix;Yoon, Jungbum;You, Chun-Yeol;Weigand, Markus;Stoll, Hermann;Schuetz, Gisela;Swagten, Henk J. M.;Koopmans, Bert;Eisebitt, Stefan;Klaeui, Mathias
基于磁畴壁运动的磁存储和逻辑器件依赖于多个磁畴壁的精确和同步位移。使用磁场的传统方法不允许多个域的同步运动。作为一种替代方法，研究了同步电流感应畴壁运动，但所需的高电流密度阻碍了在器件中的广泛应用。在这里，我们展示了一种完全不同的方法：我们使用面外磁场脉冲来移动面内畴，从而将场感应磁化动力学与向同一方向移动相邻畴壁的能力相结合。微磁模拟表明，采用具有相同手性的横向畴壁，结合规则的钉钉位置和不对称脉冲，可以实现多个磁壁的同步永久位移。通过扫描透射x射线显微镜，我们能够实验证明由于面外磁场脉冲引起的面内磁化畴壁运动。磁畴壁可以形成具有高存储密度的信息技术的基础，但需要相对较高的电流密度来驱动自旋扭矩。在这里，作者展示了一种完全不同的方法，垂直磁场脉冲同步移动畴壁。
Magnetic storage and logic devices based on magnetic domain wall motion rely on the precise and synchronous displacement of multiple domain walls. The conventional approach using magnetic fields does not allow for the synchronous motion of multiple domains. As an alternative method, synchronous current-induced domain wall motion was studied, but the required high-current densities prevent widespread use in devices. Here we demonstrate a radically different approach: we use out-of-plane magnetic field pulses to move in-plane domains, thus combining field-induced magnetization dynamics with the ability to move neighbouring domain walls in the same direction. Micromagnetic simulations suggest that synchronous permanent displacement of multiple magnetic walls can be achieved by using transverse domain walls with identical chirality combined with regular pinning sites and an asymmetric pulse. By performing scanning transmission X-ray microscopy, we are able to experimentally demonstrate in-plane magnetized domain wall motion due to out-of-plane magnetic field pulses. Magnetic domain walls could form the basis for information technology with high storage density, but require comparatively high current densities to be moved by spin torque. Here, the authors demonstrate a radically different approach with perpendicular magnetic field pulses moving domain walls synchronously.
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通讯作者：
Klaeui, Mathias