All-in-all-out magnetic domain size in pyrochlore iridate thin films as probed by local magnetotransport
All-in-all-out magnetic domain size in pyrochlore iridate thin films as probed by local magnetotransport
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DOI：
10.1063/1.4939742
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发表时间：
2016-01-11
影响因子：
4
通讯作者：
Kawasaki, M.
中科院分区：
文献类型：
--
作者：
Fujita, T. C.;Uchida, M.;Kawasaki, M.
火绿石铱酸盐由于从理论上预测了一种可能的自旋有序的拓扑半金属相而受到越来越多的关注。与拓扑带结构有关的磁畴壁传导的最新发现刺激了该体系中磁畴分布的研究。本文采用磁阻法（MR）研究了Eu2Ir2O7单晶薄膜中磁畴的大小。已知全入全自旋结构的两个不同磁畴表现出线性MR，但具有相反的符号，这使我们能够估计图案通道中两个磁畴的比例。在零场冷却后，80 × 60 μ m(2)通道的线性磁流变率几乎为零，表明小于通道尺寸的畴是随机分布的。相比之下，在2 × 2 μ m(2)通道中检测到线性MR值的广泛分布，反映了取决于每个冷却周期的可检测域大小。与模拟结果相比，我们估计单个全磁畴的平均大小为1-2 μ m。(C) 2016 AIP Publishing LLC。
Pyrochlore iridates have attracted growing attention because of a theoretical prediction of a possible topological semimetal phase originating from all-in-all-out spin ordering. Related to the topological band structure, recent findings of the magnetic domain wall conduction have stimulated investigations of magnetic domain distribution in this system. Here, we investigate the size of magnetic domains in Eu2Ir2O7 single crystalline thin films by magnetoresistance (MR) using microscale Hall bars. Two distinct magnetic domains of the all-in-all-out spin structure are known to exhibit linear MR but with opposite signs, which enables us to estimate the ratio of the two domains in the patterned channel. The linear MR for 80 x 60 mu m(2) channel is nearly zero after zero-field cooling, suggesting random distribution of domains smaller than the channel size. In contrast, the wide distribution of the value of the linear MR is detected in 2 x 2 mu m(2) channel, reflecting the detectable domain size depending on each cooling-cycle. Compared to simulation results, we estimate the average size of a single all-in-all-out magnetic domain as 1-2 mu m. (C) 2016 AIP Publishing LLC.