Vortex polarity switching by a spin-polarized current.
Vortex polarity switching by a spin-polarized current.
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DOI：
10.1103/physrevlett.98.056604
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发表时间：
2006-07
影响因子：
8.6
通讯作者：
J. Caputo;Y. Gaididei;F. Mertens;D. Sheka
中科院分区：
文献类型：
--
作者：
J. Caputo;Y. Gaididei;F. Mertens;D. Sheka
研究了磁性纳米点涡旋态的自旋转移效应。自旋电流的作用类似于垂直于纳米点的有效磁场。然后，具有平行于电流极化的磁化（极性）的涡旋在能量上是有利的。通过简单的能量分析和直接自旋晶格模拟，我们预测了涡旋的极性转换。对于磁存储设备，电流比磁场更有效地切换纳米点中涡旋的极性。
The spin-transfer effect is investigated for the vortex state of a magnetic nanodot. A spin current is shown to act similarly to an effective magnetic field perpendicular to the nanodot. Then a vortex with magnetization (polarity) parallel to the current polarization is energetically favorable. Following a simple energy analysis and using direct spin-lattice simulations, we predict the polarity switching of a vortex. For magnetic storage devices, an electric current is more effective to switch the polarity of a vortex in a nanodot than the magnetic field.