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Correlating Magnetic Structure and Magnetotransport in Semimetal Thin Films of Eu1-xSmxTiO3

Published

Author(s)

Zach Porter, Ryan F. Need, Kaveh Ahadi, Yang Zhao, Zhijun Xu, Brian Kirby, Jeffrey W. Lynn, Susanne Stemmer, Stephen D. Wilson

Abstract

We report on the evolution of the average and depth-dependent magnetic order in thin film samples of biaxially stressed and electron-doped EuTiO3 for samples across a doping range <0.1 to 7.8 ×1020 cm−3. Under an applied in-plane magnetic field, the G-type antiferromagnetic ground state undergoes a continuous spin-flop phase transition into in-plane, field-polarized ferromagnetism. The critical field for ferromagnetism slightly decreases with an increasing number of free carriers, yet the field evolution of the spin-flop transition is qualitatively similar across the doping range. Unexpectedly, we observe interfacial ferromagnetism with saturated Eu2+ moments at the substrate interface at low fields preceding ferromagnetic saturation throughout the bulk of the degenerate semiconductor film. We discuss the implications of these findings for the unusual magnetotransport properties of this compound.
Citation
Physical Review Materials
Volume
4
Issue
5

Keywords

EuTiO3 films, Neutron Diffraction, Polarized Neutron Reflectometry, Biaxial stress films, Depth-dependent magnetic order, Magnetic Field on G-type AFM

Citation

Porter, Z. , Need, R. , Ahadi, K. , Zhao, Y. , Xu, Z. , Kirby, B. , Lynn, J. , Stemmer, S. and Wilson, S. (2020), Correlating Magnetic Structure and Magnetotransport in Semimetal Thin Films of Eu<sub>1-x</sub>Sm<sub>x</sub>TiO<sub>3</sub>, Physical Review Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=930042 (Accessed April 18, 2024)
Created May 14, 2020, Updated October 12, 2021