传播磁场波扫过的随机场伊辛模型：非热非平衡phase diagram
Random field Ising model swept by propagating magnetic field wave: Athermal nonequilibrium phase diagram
摘要：
本文用二维蒙特卡罗模拟研究了零温下传播磁场波扫过随机场Ising铁磁体的动态稳态行为。随机场的分布为双峰型。对于传播的磁场波的频率和波长以及随机场的强度的一组固定值，确定了四种不同的动力学稳态或非平衡相。这四个非平衡相的特征在于结构因子的不同值。第一类状态，其中所有自旋都平行（向上）。第二种是传播型，由平行自旋形成的尖锐条带被发现相干移动。第三种也是传播型，其中自旋带的边界不是很尖锐。第四种，没有显示出磁自旋条纹的传播，形成上下自旋的均匀分布。这是无序相。这四种动力学相或模式的出现取决于传播磁场波的振幅值和随机（静态）场的强度。在传播场的振幅与随机场的强度所形成的平面内，画出了相图。结果表明，这些动力学相的存在既不是有限尺寸效应，也不是瞬态现象。
英文摘要：
The dynamical steady state behaviour of the random field Ising ferromagnet swept by a propagating magnetic field wave is studied at zero temperature by Monte Carlo simulation in two dimensions. The distribution of the random field is bimodal type. For a fixed set of values of the frequency and wavelength of propagating magnetic field wave and the strength of the random field, four distinct dynamical steady states or nonequilibrium phases were identified. These four nonequilibrium phases are characterised by different values of structure factors. State of first kind, where all spins are parallel (up). The second one is, the propagating type, where the sharp strips formed by parallel spins are found to move coherently. The third one is also propagating type, where the boundary of the strips of spins is not very sharp. The fourth kind, shows no propagation of stripes of magnetic spins, forming a homogeneous distribution of up and down spins. This is disordered phase The appearance of these four dynamical phases or modes depends on the value of the amplitude of propagating magnetic field wave and the strength of random (static) field. A phase diagram has also been drawn, in the plane formed by the amplitude of propagating field and the strength of random field. It is checked that, the existence of these dynamical phases is neither a finite size effect nor a transient phenomenon.
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