Institut für Experimentalphysik/Festkörperphysik, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, 44780 Bochum, Germany.
Philos Trans A Math Phys Eng Sci. 2012 Dec 28;370(1981):5783-93. doi: 10.1098/rsta.2011.0401.
Artificial dipolar spin-ice patterns have attracted much attention recently because of their rich configurations and excitations in the form of Dirac strings connecting magnetic monopoles. We have analysed the distribution of excitations in the form of strings and vertices carrying magnetic charges Q=±3q in honeycomb artificial spin-ice patterns. Two types of patterns are compared, those that terminate with open hexagons and those with closed hexagons. The dipole configurations and the frequency of spin-ice rule-violating Q=±3q vertices depend slightly on the boundary conditions of the pattern. Upon rotation of the patterns by 2π in a coercive magnetic field of 500 Oe, complete reversibility of the charge and string configuration is observed.
人工偶极自旋冰图案因其丰富的构型和狄拉克弦形式的激发而备受关注，这些狄拉克弦连接着磁单极子。我们分析了在蜂窝状人工自旋冰图案中以弦和携带磁荷 Q=±3q 的顶点形式存在的激发的分布。我们比较了两种图案，一种是带有开放六边形的图案，另一种是带有封闭六边形的图案。偶极子构型和违反自旋冰规则的 Q=±3q 顶点的频率稍微取决于图案的边界条件。在 500 Oe 的外加磁场中旋转图案 2π 时，观察到电荷和字符串构型完全可逆。
