Abstract
We probe the local magnetic properties of interfaces between the insulating ferromagnet EuS and the topological insulator using low energy muon spin rotation (). We compare these to the interface between EuS and the topologically trivial metal, titanium. Below the magnetic transition of EuS, we detect strong local magnetic fields which extend several nm into the adjacent layer and cause a complete depolarization of the muons. However, in both and titanium we measure similar local magnetic fields, implying that their origin is mostly independent of the topological properties of the interface electronic states. In addition, we use resonant soft x-ray angle resolved photoemission spectroscopy (SX-ARPES) to probe the electronic band structure at the interface between EuS and . By tuning the photon energy to the Eu antiresonance at the Eu pre-edge we are able to detect the conduction band, through a protective capping layer and the EuS layer. Moreover, we observe a signature of an interface-induced modification of the buried wave functions and/or the presence of interface states.
4 More- Received 26 November 2018
DOI:https://doi.org/10.1103/PhysRevB.99.064423
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