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Quasi-wetting and morphological phase transitions in confined far-from-equilibrium magnetic thin films

机译:在限制条件下的准润湿和形态相变   远离平衡的磁性薄膜

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摘要

The growth of confined magnetic films with ferromagnetic interactions betweennearest-neighbor spins is studied in a stripped $(1+1)-$dimensional rectangulargeometry. Magnetic films are grown irreversibly by adding spins at theboundaries of the growing interface. A competing situation with two oppositeshort range surface magnetic fields of the same magnitude is analyzed. Due tothe antisymmetric condition considered, an interface between domains with spinshaving opposite orientations develops along the growing direction. Suchinterface undergoes a localization-delocalization transition that is identifiedas a quasi-wetting transition, in qualitative agreement with observationsperformed under equilibrium conditions. In addition, the film also exhibits agrowing interface that undergoes morphological transitions in the growth mode.It is shown that, as a consequence of the nonequilibrium nature of theinvestigated model, the subtle interplay between finite-size effects, wetting,and interface growth mechanisms leads to more rich and complex physicalfeatures than in the equilibrium counterpart. Indeed, a phase diagram thatexhibits eight distinct regions is evaluated and discussed. In thethermodynamic limit, the whole ordered phase (which contains the quasi-wettingtransition) collapses, while within the disordered phase, standardextrapolation procedures show that only two regions are present in the phasediagram of the infinite system.
机译:在剥离的(1 + 1)-$维矩形几何中研究了具有近邻自旋之间的铁磁相互作用的受限磁性膜的生长。通过在生长界面的边界处增加自旋,磁性膜不可逆地生长。分析了具有相同大小的两个相对的短程表面磁场的竞争情况。由于考虑了反对称条件,具有自旋相反方向的畴之间的界面沿生长方向发展。这种界面经历了局部-离域转变,该转变被确定为准润湿转变,与在平衡条件下进行的观测结果在定性上吻合。此外,该薄膜还表现出在生长模式中经历形态转变的生长界面。研究表明,由于研究模型的非平衡性质,有限尺寸效应,润湿和界面生长机制之间的微妙相互作用导致了具有比均衡对应物更丰富和复杂的物理特征。实际上,已经评估并讨论了展示八个不同区域的相图。在热力学极限中,整个有序相(包含准润湿转变)崩溃,而在无序相中,标准外推程序表明无限系统的相图中仅存在两个区域。

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