磁性纳米环和椭圆纳米颗粒的标度分析及应用：Phase Diagram
Scaling Analysis and Application: Phase Diagram of Magnetic Nanorings and Elliptical Nanoparticles
摘要：
研究了不同几何形状、晶体各向异性和晶格结构的单畴纳米颗粒的磁性。最近提出的缩放方法被证明是普遍的，并与维数分析加上{ \em不完全}自相似的假设协议。它是用来获得具有三个竞争配置的磁性纳米粒子的相图：面内和面外的铁磁性和涡旋形成。分析了涡核对标度行为和相图的影响。三维相图得到的圆柱形纳米环，取决于它们的高度，外和内半径。相图中的三相点与环的内径成线性关系。还研究了椭圆形磁性纳米颗粒。提出了一种新的双涡结构参数化方法，并确定了相图中双涡为稳定基态的区域。
英文摘要：
The magnetic properties of single-domain nanoparticles with different geometric shapes, crystalline anisotropies and lattice structures are investigated. A recently proposed scaling approach is shown to be universal and in agreement with dimensional analysis coupled with an assumption of {\em incomplete} self-similarity. It is used to obtain phase diagrams of magnetic nanoparticles featuring three competing configurations: in-plane and out-of-plane ferromagnetism and vortex formation. The influence of the vortex core on the scaling behavior and phase diagram is analyzed. Three-dimensional phase diagrams are obtained for cylindrical nanorings, depending on their height, outer and inner radius. The triple points in these phase diagrams are shown to be in linear relationship with the inner radius of the ring. Elliptically shaped magnetic nanoparticles are also studied. A new parametrization for double vortex configurations is proposed, and regions in the phase diagram are identified where the double vortex is a stable ground state.
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