论文标题
基于涡旋的传感器降噪的旋转动力学
Spin-torque Dynamics for Noise Reduction in Vortex-based Sensors
论文作者
论文摘要
如今，磁磁质传感器的性能主要受1/F低频噪声的限制。在这里，我们研究了基于涡旋的TMR传感器中的噪声组件。我们比较设备的不同磁化配置中的噪声水平，即涡流状态或平行或反平行状态。我们发现，涡旋状态至少比统一状态更加嘈杂。然而，通过激活自旋转移诱导的涡旋配置动力学，我们观察到1/f噪声的降低，即接近在AP状态下测得的值，因为涡流核心的可能性较低，可以固定在缺陷地点中。此外，通过通过非共振RF场或电流驱动涡流的动力学，我们证明了1/F噪声可以进一步降低。通过利用其自旋转移动力学来减少基于涡旋的设备中1/F低频噪声的能力，从而增强了它们在磁性传感器景观中的适用性。
Performance of magnetoresistive sensors is today mainly limited by their 1/f low-frequency noise. Here, we study this noise component in vortex-based TMR sensors. We compare the noise level in different magnetization configurations of the device, i.e vortex state or uniform parallel or antiparallel states. We find that the vortex state is at least an order of magnitude noisier than the uniform states. Nevertheless, by activating the spin-transfer induced dynamics of the vortex configuration, we observe a reduction of the 1/f noise, close to the values measured in the AP state, as the vortex core has a lower probability of pinning into defect sites. Additionally, by driving the dynamics of the vortex core by a non-resonant rf field or current we demonstrate that the 1/f noise can be further decreased. The ability to reduce the 1/f low-frequency noise in vortex-based devices by leveraging their spin-transfer dynamics thus enhances their applicability in the magnetic sensors' landscape.
