arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.09033cond-mat.mes-hall
收藏

自旋angular momentum非局域转移促进的确定性全光磁化写入

Deterministic all-optical magnetization writing facilitated by non-local transfer of spin angular momentum

Youri L. W. van Hees, Paul van de Meugheuvel, Bert Koopmans, Reinoud Lavrijsen

摘要:

自从大约十年前发现全光磁化开关(AOS)以来,这种仅使用飞秒激光脉冲操纵磁化的现象已经为未来的数据存储和逻辑器件提供了巨大的潜力。已经观察到两种不同的机制,其中最终磁化状态由许多入射激光脉冲的螺旋度定义,或者由单个脉冲切换。到目前为止,什么是难以捉摸的,但重要的应用程序,是一个特定的磁化状态的确定性写入一个单一的激光脉冲。在这项工作中,我们通过实验证明了这样的机制,利用自旋极化电流,这是光产生的铁磁参考层,协助或阻碍切换在相邻的Co/Gd双层。我们示出了确定性写入的“向上”和“向下”状态,分别使用1或2个脉冲的序列。此外,我们证明了非本地起源的影响,通过改变所产生的自旋电流的大小。我们的确定性磁化写入的演示可以提供一个重要的一步,实现未来的光寻址自旋电子存储器设备。

英文摘要:

Ever since the discovery of all-optical magnetization switching (AOS) around a decade ago, this phenomenon of manipulating magnetization using only femtosecond laser pulses has promised a large potential for future data storage and logic devices. Two distinct mechanisms have been observed, where the final magnetization state is either defined by the helicity of many incoming laser pulses, or toggled by a single pulse. What has thus far been elusive, yet essential for applications, is the deterministic writing of a specific magnetization state with a single laser pulse. In this work we experimentally demonstrate such a mechanism by making use of a spin polarized current which is optically generated in a ferromagnetic reference layer, assisting or hindering switching in an adjacent Co/Gd bilayer. We show deterministic writing of an 'up' and 'down' state using a sequence of 1 or 2 pulses, respectively. Moreover, we demonstrate the non-local origin of the effect by varying the magnitude of the generated spin current. Our demonstration of deterministic magnetization writing could provide an essential step towards the implementation of future optically addressable spintronic memory devices.

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。

↑