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arXiv 0909.4920cond-mat.mtrl-scicond-mat.other
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具有磁偶极模振荡的准二维铁氧体粒子场的时空对称性破坏

Space-time symmetry violation of the fields in quasi-2D ferrite particles with magnetic-dipolar-mode oscillations

E. O. Kamenetskii

摘要:

在降维的磁性系统中,偶极相互作用的影响允许长程有序相的存在。长程磁偶极相互作用是解释在核磁共振、铁磁共振和玻色-爱因斯坦凝聚结构中观察到的许多奇特现象的核心。在本文中,我们表明,磁偶极模(MDM)在准二维铁氧体磁盘的特点是对称性破缺效应。我们的分析是基于假设的物理意义的静磁势函数作为一个复杂的标量波函数,假定长程相位相关。铁氧体圆盘中MDM振荡的一个重要特征涉及这样一个事实,即具有对称参数和对称基本方程的结构进入非时空对称的本征态。通过对螺旋坐标系中静磁波传播的分析,找到了正确的解。对于一个铁氧体磁盘,我们表明,虽然两个螺旋波的组合物可能会获得一个几何相位在一个时期内的溢出,每一个单独的螺旋波有一个动态的相位溢出,因此表现为一个双值函数。我们证明了独特的拓扑结构的领域在铁氧体磁盘是密切相关的MDM振荡的对称性破缺性质。该解决方案给出了MDM功率流密度涡的核心在磁盘中心和方位角运行的磁化波。可以预期,所提出的磁偶极相互作用的长程有序相和时空破坏性质的模型可以用于其他磁结构,不同于具有降维的铁磁共振系统。

英文摘要:

In magnetic systems with reduced dimensionality, the effects of dipolar interactions allow the existence of long-range ordered phases. Long-range magnetic-dipolar interactions are at the heart of the explanation of many peculiar phenomena observed in nuclear magnetic resonance, ferromagnetic resonance, and Bose-Einstein-condensate structures. In this paper we show that magnetic-dipolar-modes (MDMs) in quasi-2D ferrite disks are characterized by symmetry breaking effects. Our analysis is based on postulates about a physical meaning of the magnetostatic-potential function as a complex scalar wave function, which presumes the long-range phase correlations. An important feature of the MDM oscillations in a ferrite disk concerns the fact that a structure with symmetric parameters and symmetric basic equations goes into eigenstates that are not space-time symmetric. The proper solutions are found based on an analysis of magnetostatic-wave propagation in a helical coordinate system. For a ferrite disk, we show that while a composition of two helical waves may acquire a geometrical phase over-running of during a period, every separate helical wave has a dynamical phase over-running of and so behaves as a double-valued function. We demonstrate that unique topological structures of the fields in a ferrite disk are intimately related to the symmetry breaking properties of MDM oscillations. The solutions give the MDM power-flow-density vortices with cores at the disk center and azimuthally running waves of magnetization. One can expect that the proposed models of long-range ordered phases and space-time violation properties of magnetic-dipolar interactions can be used in other magnetic structures, different from the ferromagnetic-resonance system with reduced dimensionality.

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