Observation of unconventional anomalous Hall effect in epitaxial CrTe thin films

摘要

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.