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arXiv 1709.02876cond-mat.mes-hall
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可调各向异性多层叠层中磁径向涡核的观测

Observation of Magnetic Radial Vortex Nucleation in a Multilayer Stack with Tunable Anisotropy

Vedat Karakas, Aisha Gokce, Ali Taha Habiboglu, Sevdenur Arpaci, Kaan Ozbozduman, Ibrahim Cinar, Cenk Yanik, Riccardo Tomasello, Silvia Tacchi, Giulio Siracusan… 展开作者

Vedat Karakas, Aisha Gokce, Ali Taha Habiboglu, Sevdenur Arpaci, Kaan Ozbozduman, Ibrahim Cinar, Cenk Yanik, Riccardo Tomasello, Silvia Tacchi, Giulio Siracusano, Mario Carpentieri, Giovanni Finocchio, Thomas Hauet, Ozhan Ozatay

摘要:

最近发现的奇异磁结构,即磁孤子出现在存在体或界面的Dzyaloshinskiii-Moriya相互作用(i-zyaloshinskiii-Moriya Interaction,i-zyaloshinskii-Moriya Interaction),激发了科学家们探索其在新兴自旋电子技术,如赛道磁存储器,自旋逻辑,射频纳米振荡器和传感器的潜在应用。这些研究的动机是由于它们的尺寸小,拓扑稳定性和容易的自旋扭矩驱动的操纵与低得多的阈值电流密度让位于改进的存储容量,以及更快的操作与有效利用能量,相对于传统的微磁结构的可预见的优势。在这项工作中,我们表明,在Pt/CoFeB/Ti多层膜中的i-bismuth的存在下,通过界面工程和后期制作处理来调整磁各向异性(包括面内和面间),我们可以稳定各种磁配置,如Néel skyrmions,马蹄铁,最重要的是第一次,最近预测的孤立径向涡旋在室温和零偏置场下。特别是,径向涡旋状态与它的绝对收敛或发散从一个单一的点可以潜在地提供令人兴奋的新的应用,如粒子捕获/脱陷除了磁阻存储器与有效的开关,其中径向涡旋状态可以作为一个源的自旋极化电流与径向极化。

英文摘要:

Recently discovered exotic magnetic configurations, namely magnetic solitons appearing in the presence of bulk or interfacial Dzyaloshinskii-Moriya Interaction (i-DMI), have excited scientists to explore their potential applications in emerging spintronic technologies such as race-track magnetic memory, spin logic, radio frequency nano-oscillators and sensors. Such studies are motivated by their foreseeable advantages over conventional micro-magnetic structures due to their small size, topological stability and easy spin-torque driven manipulation with much lower threshold current densities giving way to improved storage capacity, and faster operation with efficient use of energy. In this work, we show that in the presence of i-DMI in Pt/CoFeB/Ti multilayers by tuning the magnetic anisotropy (both in-plane and perpendicular-to-plane) via interface engineering and postproduction treatments, we can stabilize a variety of magnetic configurations such as Néel skyrmions, horseshoes and most importantly for the first time, the recently predicted isolated radial vortices at room temperature and under zero bias field. Especially, the radial vortex state with its absolute convergence to or divergence from a single point can potentially offer exciting new applications such as particle trapping/detrapping in addition to magnetoresistive memories with efficient switching, where the radial vortex state can act as a source of spin-polarized current with radial polarization.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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