Ji Y, Chien C L, Stiles M D
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
Phys Rev Lett. 2003 Mar 14;90(10):106601. doi: 10.1103/PhysRevLett.90.106601. Epub 2003 Mar 11.
Evidence for a current-induced spin-transfer torque effect has been investigated in a series of point contacts to single ferromagnetic layers. At specific current densities, abrupt resistance changes, similar to those attributed to current-induced spin-wave excitations in multilayers, have been observed for one current polarity. The critical current for these resistance changes depends linearly on the external field applied perpendicular to the layer. The observed effect is interpreted as a current-driven heterogeneous instability in an otherwise uniform ferromagnetic layer.
在一系列与单铁磁层的点接触中，对电流诱导自旋转移矩效应的证据进行了研究。在特定电流密度下，对于一种电流极性，观察到了类似于多层中归因于电流诱导自旋波激发的突然电阻变化。这些电阻变化的临界电流线性依赖于垂直施加于该层的外场。所观察到的效应被解释为在原本均匀的铁磁层中由电流驱动的非均匀不稳定性。
