论文标题
旋转的磁铁中的自旋treactle用自旋电流观察到
Spin treacle in a frustrated magnet observed with spin current
论文作者
论文摘要
通过旋转电流，自旋角动量的流动，我们在沮丧的磁系统中找到了“自旋treactle”的状态。为了确定其存在，我们在纳米尺度的自旋玻璃杯中进行了自旋传输测量。在温度足够高的温度下，磁矩在高频下波动，旋转霍尔角（自旋电流和电荷电流之间的转换率）与温度无关。在特定温度$ t^{*} $下，自旋大厅的角度开始降低，并在较低的温度下完全消失。我们认为后者对应于纳米尺度自旋玻璃的自旋冷冻温度$ t _ {\ rm f} $，其中传导电子自旋的方向是通过与局部矩的交换耦合随机化的。本实验\ textIt {量词}验证了$ t _ {\ rm f} $和$ t^{*} $之间存在独特的“旋转条件”。我们还量化了从传导电子的自旋松弛时间从旋转条件中局部磁矩波动的时间尺度。
By means of spin current, the flow of spin angular momentum, we find a regime of "spin treacle" in a frustrated magnetic system. To establish its existence, we have performed spin transport measurements in nanometer-scale spin glasses. At temperatures high enough that the magnetic moments fluctuate at high frequencies, the spin Hall angle, the conversion yield between spin current and charge current, is independent of temperature. The spin Hall angle starts to decrease at a certain temperature $T^{*}$ and completely vanishes at a lower temperature. We argue that the latter corresponds to the spin freezing temperature $T_{\rm f}$ of the nanometer-scale spin glass, where the direction of conduction electron spin is randomized by the exchange coupling with the localized moments. The present experiment \textit{quantitatively} verifies the existence of a distinct "spin treacle" between $T_{\rm f}$ and $T^{*}$. We have also quantified a time scale of fluctuation of local magnetic moments in the spin treacle from the spin relaxation time of conduction electrons.
