Observation of unconventional anomalous Hall effect in epitaxial CrTe thin films
topological Hall effect, CrTe films, skyrmion phase, molecular beam epitaxy
ABSTRACT We have studied the magnetic and electrical transport properties of epitaxial NiAs-type CrTe thin films grown on SrTiO3(111) substrates. Unlike rectangle hysteresis loops obtained from magnetic measurements, we have identified intriguing extra bump/dip features from anomalous Hall experiments on the films with thicknesses less than 12 nm. This observed Hall anomaly is phenomenologically consistent with the occurrence of a topological Hall effect (THE) in chiral magnets with a skyrmion phase. Furthermore, the THE contribution can be tuned by the film thickness, showing the key contribution of asymmetric interfaces in stabilizing Néel-type skyrmions. Our work demonstrates that a CrTe thin film on SrTiO3(111) substrates is a good material candidate for studying real-space topological transport.
Tsinghua University Press
Dapeng Zhao,Liguo Zhang,Iftikhar Ahmed Malik,Menghan Liao,Wenqiang Cui,Xinqiang Cai,Cheng Zheng,Luxin Li,Xiaopeng Hu,Ding Zhang,Jinxing Zhang,Xi Chen,Wanjun Jiang,Qikun Xue, Observation of unconventional anomalous Hall effect in epitaxial CrTe thin films. NanoRes.2018, 11(6): 3116–3121