Current-induced magnetization switching with a spin-polarized scanning tunneling microscope
Current-induced magnetization switching with a spin-polarized scanning tunneling microscope
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DOI：
10.1126/science.1145336
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发表时间：
2007-09-14
期刊：
影响因子：
56.9
通讯作者：
Wiesendanger, R.
中科院分区：
文献类型：
--
作者：
Krause, S.;Berbil-Bautista, L.;Wiesendanger, R.
通过注入自旋极化电流来切换磁比特的磁化程度为开发创新的高密度数据存储技术提供了可能性。我们展示了如何使用磁扫描探针尖端来寻址和局部切换典型尺寸为100个原子的单个超顺磁性铁纳米岛，从而展示了电流诱导的磁化反转跨越真空势垒与自旋极化扫描隧道显微镜的最终分辨率相结合的结果。我们的技术使我们能够分离和量化磁化转换中涉及的三个基本贡献(即电流诱导的自旋扭矩、通过隧道电流加热岛屿和Oersted场效应)，从而提供了对转换机制的更好的理解。
Switching the magnetization of a magnetic bit by injection of a spin-polarized current offers the possibility for the development of innovative high-density data storage technologies. We show how individual superparamagnetic iron nanoislands with typical sizes of 100 atoms can be addressed and locally switched using a magnetic scanning probe tip, thus demonstrating current-induced magnetization reversal across a vacuum barrier combined with the ultimate resolution of spin-polarized scanning tunneling microscopy. Our technique allows us to separate and quantify three fundamental contributions involved in magnetization switching (i.e., current-induced spin torque, heating the island by the tunneling current, and Oersted field effects), thereby providing an improved understanding of the switching mechanism.