Pulsed laser deposition films from a Ba2FeMoO6 target onto SrTiO3[001]: Chemical and magnetic inhomogeneity

Daniel M. Pajerowski; Lisa J. Krayer; Brian J. Kirby; Brian B. Maranville; Julie A. Borchers; Kyeong Won Kim; David P. Norton

doi:10.1063/1.5039401

Pulsed laser deposition films from a Ba₂FeMoO₆ target onto SrTiO₃[001]: Chemical and magnetic inhomogeneity

Daniel M. Pajerowski, Lisa J. Krayer, Brian J. Kirby, Brian B. Maranville, Julie A. Borchers, Kyeong Won Kim, David P. Norton

Direct Geometry

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Abstract

Pulsed laser deposition films from Ba₂FeMoO₆ (BFMO) targets onto SrTiO₃[001] (STO) substrates have been reported previously to have non-zero magnetism at 300 K, a majority of magnetic ordering at 240 K that is less than the 370 K ordering temperature of polycrystalline BFMO, and suppressed saturation magnetization compared to polycrystalline BFMO. To interrogate these previously reported observations of BFMO on STO, we have used a combination of x-ray diffraction, atomic force microscopy, x-ray and neutron reflectivity, and x-ray photoelectron spectroscopy that shows inhomogeneities. The present results show off-stoichiometry on the A-site by incorporation of Sr from the substrate and on the B-site to have %Fe/%Mo > 1 by evolution of BaMoO₄. There is an enhanced ordering temperature and magnetic response nearer to the SrTiO₃ interface compared to the air interface. Depth dependent strain and microstructure are needed to explain the magnetic response. Holistic considerations and implications are also discussed.

Original language	English
Article number	163903
Journal	Journal of Applied Physics
Volume	124
Issue number	16
DOIs	https://doi.org/10.1063/1.5039401
State	Published - Oct 28 2018

Funding

The authors gratefully acknowledge the Summer Undergraduate Research Fellowship at the National Institute of Standards and Technology (NIST) Center for Neutron Research for Lisa J. Krayer, the financial support provided by NIST and the Center for High Resolution Neutron Scattering, and the usage of facilities supported, in part, by the National Science Foundation under Agreement No. DMR-0944772. Daniel M. Pajerowski is supported through the Scientific User Facilities Division of the Department of Energy (DOE) Office of Science, sponsored by the Basic Energy Science (BES) Program, DOE Office of Science.

Funders	Funder number
National Science Foundation
Directorate for Mathematical and Physical Sciences	0944772
National Institute of Standards and Technology
Office of Science
National Science Foundation	DMR-0944772

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title = "Pulsed laser deposition films from a Ba2FeMoO6 target onto SrTiO3[001]: Chemical and magnetic inhomogeneity",

abstract = "Pulsed laser deposition films from Ba2FeMoO6 (BFMO) targets onto SrTiO3[001] (STO) substrates have been reported previously to have non-zero magnetism at 300 K, a majority of magnetic ordering at 240 K that is less than the 370 K ordering temperature of polycrystalline BFMO, and suppressed saturation magnetization compared to polycrystalline BFMO. To interrogate these previously reported observations of BFMO on STO, we have used a combination of x-ray diffraction, atomic force microscopy, x-ray and neutron reflectivity, and x-ray photoelectron spectroscopy that shows inhomogeneities. The present results show off-stoichiometry on the A-site by incorporation of Sr from the substrate and on the B-site to have %Fe/%Mo > 1 by evolution of BaMoO4. There is an enhanced ordering temperature and magnetic response nearer to the SrTiO3 interface compared to the air interface. Depth dependent strain and microstructure are needed to explain the magnetic response. Holistic considerations and implications are also discussed.",

author = "Pajerowski, {Daniel M.} and Krayer, {Lisa J.} and Kirby, {Brian J.} and Maranville, {Brian B.} and Borchers, {Julie A.} and Kim, {Kyeong Won} and Norton, {David P.}",

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T2 - Chemical and magnetic inhomogeneity

AU - Pajerowski, Daniel M.

AU - Krayer, Lisa J.

AU - Kirby, Brian J.

AU - Maranville, Brian B.

AU - Borchers, Julie A.

AU - Kim, Kyeong Won

AU - Norton, David P.

PY - 2018/10/28

Y1 - 2018/10/28

N2 - Pulsed laser deposition films from Ba2FeMoO6 (BFMO) targets onto SrTiO3[001] (STO) substrates have been reported previously to have non-zero magnetism at 300 K, a majority of magnetic ordering at 240 K that is less than the 370 K ordering temperature of polycrystalline BFMO, and suppressed saturation magnetization compared to polycrystalline BFMO. To interrogate these previously reported observations of BFMO on STO, we have used a combination of x-ray diffraction, atomic force microscopy, x-ray and neutron reflectivity, and x-ray photoelectron spectroscopy that shows inhomogeneities. The present results show off-stoichiometry on the A-site by incorporation of Sr from the substrate and on the B-site to have %Fe/%Mo > 1 by evolution of BaMoO4. There is an enhanced ordering temperature and magnetic response nearer to the SrTiO3 interface compared to the air interface. Depth dependent strain and microstructure are needed to explain the magnetic response. Holistic considerations and implications are also discussed.

AB - Pulsed laser deposition films from Ba2FeMoO6 (BFMO) targets onto SrTiO3[001] (STO) substrates have been reported previously to have non-zero magnetism at 300 K, a majority of magnetic ordering at 240 K that is less than the 370 K ordering temperature of polycrystalline BFMO, and suppressed saturation magnetization compared to polycrystalline BFMO. To interrogate these previously reported observations of BFMO on STO, we have used a combination of x-ray diffraction, atomic force microscopy, x-ray and neutron reflectivity, and x-ray photoelectron spectroscopy that shows inhomogeneities. The present results show off-stoichiometry on the A-site by incorporation of Sr from the substrate and on the B-site to have %Fe/%Mo > 1 by evolution of BaMoO4. There is an enhanced ordering temperature and magnetic response nearer to the SrTiO3 interface compared to the air interface. Depth dependent strain and microstructure are needed to explain the magnetic response. Holistic considerations and implications are also discussed.

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Pulsed laser deposition films from a Ba₂FeMoO₆ target onto SrTiO₃[001]: Chemical and magnetic inhomogeneity

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