In this work, we have constructed and experimentally investigated frustrated arrays of dipoles forming two-dimensional artificial spin ices with different lattice parameters (rectangular arrays with horizontal and vertical lattice spacings denoted by a and b respectively). Arrays with three different aspect ratios γ = a/b = , and are studied. Theoretical calculations of low-energy demagnetized configurations for these same parameters are also presented. Experimental data for demagnetized samples confirm most of the theoretical results. However, the highest energy topology (doubly-charged monopoles) does not emerge in our theoretical model, while they are seen in experiments for large enough γ. Our results also insinuate that the string tension connecting two magnetic monopoles in a pair vanishes in rectangular lattices with a critical ratio γ = γ c = , supporting previous theoretical predictions.
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机译:在这项工作中,我们构造并实验研究了形成具有不同晶格参数的二维人造自旋冰的偶极子受阻阵列(水平阵列和垂直阵列间距分别由a和b表示的矩形阵列)。具有三种不同长宽比的数组== a / b = <数学xmlns:mml =“ http://www.w3.org/1998/Math/MathML” id =“ M2”溢出=“ scroll”> < mn mathvariant =“ bold”> 2 mn> msqrt> math>,展开▼