改进的正方形人工自旋冰中反铁磁到四极的转变
Transition from Antiferromagnetic to Quadrupole Order in a Modified Square Artificial Spin Ice
摘要：
本文给出了人工自旋冰单胞中双段有序置换的数值研究结果。每个图案顶点具有三个磁矩配置，其在零施加磁场中竞争形成磁性基态，包括最近邻和次最近邻相互作用对总静磁能的贡献。基态取决于所考虑的晶格位置的数量和构成双段的两个膜段之间的间距。蒙特卡罗模拟结果表明，在垂直于双段亚晶格易磁化轴的面内磁场作用下，双段亚晶格的长程反铁磁序可以被磁四极序所取代.四极有序态由具有反平行极化的双链段的弱相关链的子晶格组成，其允许许多不同的基态，这些基态反映了非常高的阻挫程度。
英文摘要：
The results of a numerical study of an ordered substitution of a double-segment into the unit cell of square artificial spin ice are presented. Each pattern vertex has three magnetic moment configurations that compete to form a magnetic ground state in zero applied magnetic field, including nearest-neighbor and next-nearest-neighbor interaction contributions to the total magnetostatic energy. The ground state depends on the number of lattice sites considered and the spacing between the two film segments that comprise the double segment. Monte Carlo simulations reveal that the doub le-segment sublattice adopts long-range antiferromagnetic order that can be supplanted by magnetic quadrupole order by applying an in-plane magnetic field perpendicular to the double-segment easy axis. The quadrupole-ordered state consists of a sublattice of weakly correlated chains of double-segments with antiparallel polarizations, which admits many different ground states that reflect a very high degree of frustration.
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