Vlasko-Vlasov V K, Welp U, Jiang J S, Miller D J, Crabtree G W, Bader S D
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.
Phys Rev Lett. 2001 May 7;86(19):4386-9. doi: 10.1103/PhysRevLett.86.4386.
The appearance of biquadratic exchange coupling between soft Fe and hard SmCo thin layers is found. The remanent magnetization in the Fe layer reorients from parallel to perpendicular with respect to the SmCo easy axis after application of large enough negative field. To explain such an unexpected behavior in contacting ferromagnetic layers a model is proposed based on Slonczewski's fluctuating exchange mechanism. In our samples a partial remagnetization of the hard layer creates fluctuations of the bilinear interactions. The intralayer exchange averaging of the resulting magnetization fluctuations in the soft layer causes the observed biquadratic coupling.
发现了软铁和硬钐钴薄层之间双二次交换耦合的出现。在施加足够大的负磁场后，铁层中的剩余磁化强度相对于钐钴易轴从平行重新取向为垂直。为了解释铁磁层接触中这种意外行为，基于斯隆切夫斯基的波动交换机制提出了一个模型。在我们的样品中，硬层的部分再磁化产生了双线性相互作用的波动。软层中由此产生的磁化波动的层内交换平均导致了观察到的双二次耦合。
