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

Published

May 15, 2020

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

Pub Type

Journals

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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_1-xSm_xTiO₃, Physical Review Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=930042 (Accessed April 19, 2024)