Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO3

Rosenberg, Aaron J.; Katmis, Ferhat; Kirtley, John R.; Gedik, Nuh; Moodera, Jagadeesh S.; Moler, Kathryn A.

doi:10.1103/physrevmaterials.1.074406

Title: Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of ${SrTiO}_{3}$

Journal Article · 15 December 2017 · Physical Review Materials

DOI: https://doi.org/10.1103/physrevmaterials.1.074406 · OSTI ID:1420091

Rosenberg, Aaron J. ^[1]; Katmis, Ferhat ^[2]; Kirtley, John R. ^[1]; Gedik, Nuh ^[3]; Moodera, Jagadeesh S. ^[2]; Moler, Kathryn A. ^[4]

Stanford Univ., CA (United States). Dept. of Applied Physics
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Fracsis Bitter Magnetic Lab.; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
Stanford Univ., CA (United States). Dept. of Applied Physics; Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)

The combination of ferromagnets with topological superconductors or insulators allows for new phases of matter that support excitations such as chiral edge modes and Majorana fermions. EuS, a wide-bandgap ferromagnetic insulator with a Curie temperature around 16K, and SrTiO₃ (STO), an important substrate for engineering heterostructures, may support these phases. We present scanning superconducting quantum interference device measurements of EuS grown epitaxially on STO that reveal micron-scale variations in ferromagnetism and paramagnetism. These variations are oriented along the STO crystal axes and only change their configuration upon thermal cycling above the STO cubic-to-tetragonal structural transition temperature at 105 K, indicating that the observed magnetic features are due to coupling between EuS and the STO tetragonal structure. Here, we speculate that the STO tetragonal distortions may strain the EuS, altering the magnetic anisotropy on a micron scale. This result demonstrates that local variation in the induced magnetic order from EuS grown on STO needs to be considered when engineering new phases of matter that require spatially homogeneous exchange.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: 0830228; IMR-MIP 0957616; DMR-1207469; DMR-1231319; N00014-13-1- 0301; N00014-16-1-2657; AC02-76SF00515

OSTI ID:: 1420091

Journal Information:: Physical Review Materials, Vol. 1, Issue 7; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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