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摘要翻译：
我们通过广泛的蒙特卡罗模拟研究了在三个铁磁薄膜组成的三明治结构中反铁磁耦合的多层膜中流动自旋的输运。两个外部薄膜通过非磁性间隔物与中间薄膜相互作用。自旋模型是Ising模型，考虑了面内输运。考虑到了各种相互作用。我们发现，通过该系统的流动自旋的电流强烈地依赖于多层膜的磁有序性：在低于（高于）转变温度$T_c$的温度下，观察到一个强（弱）电流。这导致阻力在$T_C$上的强烈跳跃。此外，我们还观察到在临界区的自旋电流在略高于$T_C$处有一个反常的变化，即一个峰值。我们发现这一峰是由于在低T$有序相和真正顺磁无序相之间的温度区域中畴的形成。在临界现象理论中已经知道这种区域的存在。这里得到的电阻的行为与最近的实验进行了比较。观察到与我们的物理解释非常一致。我们还讨论了各种物理参数对模型的影响，如相互作用范围、电场和磁场的强度、磁性薄膜和非磁性间隔层厚度。
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英文标题：
《Spin transport in magnetic multilayers》
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作者：
K. Akabli, H. T. Diep and S. Reynal
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最新提交年份：
2007
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分类信息：
一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
We study by extensive Monte Carlo simulations the transport of itinerant spins travelling inside a multilayer composed of three ferromagnetic films antiferromagnetically coupled to each other in a sandwich structure. The two exterior films interact with the middle one through non magnetic spacers. The spin model is the Ising one and the in-plane transport is considered. Various interactions are taken into account. We show that the current of the itinerant spins going through this system depends strongly on the magnetic ordering of the multilayer: at temperatures $T$ below (above) the transition temperature $T_c$, a strong (weak) current is observed. This results in a strong jump of the resistance across $T_c$. Moreover, we observe an anomalous variation, namely a peak, of the spin current in the critical region just above $T_c$. We show that this peak is due to the formation of domains in the temperature region between the low-$T$ ordered phase and the true paramagnetic disordered phase. The existence of such domains is known in the theory of critical phenomena. The behavior of the resistance obtained here is compared to a recent experiment. An excellent agreement with our physical interpretation is observed. We also show and discuss effects of various physical parameters entering our model such as interaction range, strength of electric and magnetic fields and magnetic film and non magnetic spacer thicknesses.
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PDF链接：
https://arxiv.org/pdf/705.0879
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