Spin-torque oscillator using a perpendicular polarizer and a planar free layer
Spin-torque oscillator using a perpendicular polarizer and a planar free layer
复制标题
DOI：
10.1038/nmat1905
复制
发表时间：
2007-06-01
期刊：
影响因子：
41.2
通讯作者：
Dieny, B.
中科院分区：
文献类型：
--
作者：
Houssameddine, D.;Ebels, U.;Dieny, B.
自旋电子学材料最近被认为是用于射频器件，如振荡器，通过利用自旋极化电流和它所通过的磁性纳米结构之间的自旋角动量的转移。虽然以前的自旋转移振荡器（STO）是基于面内磁化结构，在这里，我们提出了一个STO的实现，它包含一个垂直的自旋电流极化器结合面内磁化自由层。该器件的特征在于自由层磁化的高频振荡，与在阈值电流处由来自垂直极化电子的自旋转移力矩引起的面外稳态进动一致。结果总结在静态和动态的电流场状态图，将是重要的设计与增强输出信号的STO。
Spintronics materials have recently been considered for radio-frequency devices such as oscillators by exploiting the transfer of spin angular momentum between a spin-polarized electrical current and the magnetic nanostructure it passes through. While previous spin- transfer oscillators ( STOs) were based on in-plane magnetized structures, here we present the realization of an STO that contains a perpendicular spin current polarizer combined with an in- plane magnetized free layer. This device is characterized by high-frequency oscillations of the free-layer magnetization, consistent with out-of-plane steady-state precessions induced at the threshold current by a spin- transfer torque from perpendicularly polarized electrons. The results are summarized in static and dynamic current - field state diagrams and will be of importance for the design of STOs with enhanced output signals.