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Title: Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO 3

Abstract

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.

Authors:
 [1];  [2];  [1];  [3];  [2];  [4]
  1. Stanford Univ., CA (United States). Dept. of Applied Physics
  2. 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
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
  4. 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)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1420091
Grant/Contract Number:  
0830228; IMR-MIP 0957616; DMR-1207469; DMR-1231319; N00014-13-1- 0301; N00014-16-1-2657; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 7; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Magnetic techniques; Magnetoelastic effect

Citation Formats

Rosenberg, Aaron J., Katmis, Ferhat, Kirtley, John R., Gedik, Nuh, Moodera, Jagadeesh S., and Moler, Kathryn A. Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO3. United States: N. p., 2017. Web. doi:10.1103/physrevmaterials.1.074406.
Rosenberg, Aaron J., Katmis, Ferhat, Kirtley, John R., Gedik, Nuh, Moodera, Jagadeesh S., & Moler, Kathryn A. Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO3. United States. doi:10.1103/physrevmaterials.1.074406.
Rosenberg, Aaron J., Katmis, Ferhat, Kirtley, John R., Gedik, Nuh, Moodera, Jagadeesh S., and Moler, Kathryn A. Fri . "Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO3". United States. doi:10.1103/physrevmaterials.1.074406. https://www.osti.gov/servlets/purl/1420091.
@article{osti_1420091,
title = {Spatially modulated magnetic structure of EuS due to the tetragonal domain structure of SrTiO3},
author = {Rosenberg, Aaron J. and Katmis, Ferhat and Kirtley, John R. and Gedik, Nuh and Moodera, Jagadeesh S. and Moler, Kathryn A.},
abstractNote = {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.},
doi = {10.1103/physrevmaterials.1.074406},
journal = {Physical Review Materials},
number = 7,
volume = 1,
place = {United States},
year = {2017},
month = {12}
}

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Cited by: 1 work
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Figures / Tables:

FIG. 1 FIG. 1: Captured RHEED patterns of EuS after growth and annealing are shown in (a)-(d). RHEED snap-shot taken with 15 keV electron beam along the [110]p-azimuth (a) and [001]p-azimuth (b) after growth and annealing, respectively, (c) and (d). (e) X-ray diffraction of the EuS/STO heterostructure (black line) and STO substratemore » without EuS layer (red line). Besides the characteristic intense substrate reflection at the low angle side, another reflection is visible around ≃ 29.5° , which belongs to the (002)p reflection of EuS. The representative data also shows pronounced Laue oscillations (oscillations in the vicinity of the EuS Bragg peak), which indicate the coherency of the top and the bottom surface parallelism of the epitaxial EuS layer.« less

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