准二维磁点中的涡旋形成图
Diagram for vortex formation in quasi-two-dimensional magnetic dots
摘要：
在二维磁系统中涡旋型非线性物体的存在本身是构建纳米器件的最有前途的候选者之一，可用于存储数据，以及用于读取和写入磁头的构建。涡旋表现为磁性纳米盘的基态，其磁矩通过偶极-偶极势？相互作用。在这项工作中，它是在三角形，正方形和六边形晶格的纳米盘作为晶格的大小和偶极相互作用D的强度的函数的涡旋的形成条件进行了研究。结果表明，涡旋态和类电容态之间存在一条“跃迁”线。该线具有取决于系统的尺寸L的有限尺寸标度形式，如Dc = D 0 + 1/A（？）1 + B * L^2）？这三种类型的晶格都遵循这种行为。在涡相内部，可以识别由常数D = Dc线分隔的两种类型的涡：面内涡和面外涡。我们观察到，在三角晶格中没有出现面外相。在两层系统中，额外的偶极子层作为有效的面外各向异性，在涡旋中心诱导大的S ^z分量。同时，我们还分析了面外涡分量转换的机理。与一些文献报道的结果相反，我们发现的证据表明，该机制不是一个创建-湮灭涡反涡过程。
英文摘要：
The existence of nonlinear objects of the vortex type in two-dimensional magnetic systems presents itself as one of the most promising candidates for the construction of nanodevices, useful for storing data, and for the construction of reading and writing magnetic heads. The vortex appears as the ground state of a magnetic nanodisk whose magnetic moments interact via dipole-dipole potential?. In this work it is investigated the conditions for the formation of vortices in nanodisks in triangular, square, and hexagonal lattices as a function of the size of the lattice and of the strength of the dipole interaction D. Our results show that there is a "transition" line separating the vortex state from a capacitor like state. This line has a finite size scaling form depending on the size, L, of the system as Dc=D0 +1/A(?1+B*L^2)?. This behavior is obeyed by the three types of lattices. Inside the vortex phase it is possible to identify two types of vortices separated by a constant, D=Dc, line: An in-plane and an out-of-plane vortex. We observed that the out-of-plane phase does not appear for the triangular lattice. In a two layer system the extra layer of dipoles works as an effective out-of-plane anisotropy inducing a large S^z component at the center of the vortex. Also, we analyzed the mechanism for switching the out-of-plane vortex component. Contrary to some reported results, we found evidences that the mechanism is not a creation-annihilation vortex anti-vortex process.
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