Nanoconstriction-based spin-Hall oscillators
Nanoconstriction-based spin-Hall oscillators
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基于纳米收缩的自旋霍尔振荡器
DOI：
10.1109/intmag.2015.7157174
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Demokritov
中科院分区：
文献类型：
--
作者：
V. Demidov;S. Urazhdin;A. Zholud;A. Sadovnikov;S. Demokritov
最近的观察，由纯自旋电流驱动的相干微波磁化振荡提供了新的机会，主动自旋电子器件的发展。证明了由自旋霍尔效应（SHE）产生的纯自旋电流可以用于实现不需要电流流过有源磁性层的磁性纳米振荡器，从而允许避免与传统自旋转移矩（STT）自旋电子器件典型的磁性层中的大电流密度相关联的有害影响。先前展示的自旋霍尔纳米振荡器（SHNO）被发现在低温下表现出相对大的功率和小的自振荡线宽。然而，这两种特性在升高的温度下显著降低。如果可以在SHNO中选择性地激发具有显著空间范围的单个动力学模式，则可以避免该缺点。可以预期，自振荡区域应该取决于自旋注入几何形状。然而，在实践中，自旋电流的局部注入导致所谓的“子弹”自振荡模式的自发形成，其空间尺寸由非线性自定位效应而不是自旋电流注入区域决定。在这里，我们展示了SHNO的特点是有效的室温产生的相干微波信号，通过控制自振荡特性，使用磁偶极效应，而不是自定位。
Recent observations of coherent microwave magnetization oscillations driven by pure spin current have provided novel opportunities for the development of active spintronic devices. It was demonstrated that pure spin current produced by the spin-Hall effect (SHE) can be utilized to implement magnetic nano-oscillators that do not require electrical current flows through the active magnetic layer, allowing one to avoid detrimental effects associated with large densities of the electric current in the magnetic layer typical for the traditional spin-transfer torque (STT) spintronic devices. The previously demonstrated spin-Hall nano-oscillators (SHNO) were found to exhibit a relatively large power and small auto-oscillation linewidth at cryogenic temperatures. However, both of these characteristics significantly degrade at increased temperatures. This drawback can be avoided if a single dynamical mode with a significant spatial extent can be selectively excited in an SHNO. One can expect that the auto-oscillation area should depend on the spin injection geometry. However, in practice local injection of spin current leads to the spontaneous formation of the so-called “bullet” auto-oscillation mode, whose spatial dimensions are determined by the nonlinear self-localization effects rather than the spin-current injection area. Here, we demonstrate SHNOs characterized by efficient room-temperature generation of coherent microwave signals, achieved by controlling the auto-oscillation characteristics using magnetic dipolar effects instead of the self-localization.
影响因子：
16.6
作者：
Demidov, V. E.;Ulrichs, H.;Urazhdin, S.
通讯作者：
Urazhdin, S.
影响因子：
4
作者：
Demidov, V. E.;Urazhdin, S.;Demokritov, S. O.
通讯作者：
Demokritov, S. O.