Impact of ferromagnetism on neutron reflectometry of passivated iron

Jingxing Feng; James F. Browning; M. R. Fitzsimmons; Qiang Wang; Jaroslaw Majewski; Peng Wang; Dale W. Schaefer

doi:10.1016/j.tsf.2022.139464

Impact of ferromagnetism on neutron reflectometry of passivated iron

Jingxing Feng, James F. Browning, M. R. Fitzsimmons, Qiang Wang, Jaroslaw Majewski, Peng Wang, Dale W. Schaefer

Reflectometry

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We compare polarized neutron reflectometry, non-polarized neutron reflectometry, and x-ray reflectometry for pure, magnetically polarized, air-passivated iron. Magnetism in the underlying metal enhances contrast with the surface oxide leading to precise magnetic and composition profiles of the oxide layer. The native passive film is a uniform, fully dense, non-ferromagnetic oxide with an average thickness of 31.9 ± 0.7 Å. Non-polarized neutron reflectometry gives substantial errors in the inferred interfacial profiles.

Original language	English
Article number	139464
Journal	Thin Solid Films
Volume	759
DOIs	https://doi.org/10.1016/j.tsf.2022.139464
State	Published - Oct 1 2022

Funding

We thank Jon Kevin Baldwin from LANL/CINT for preparation and characterization of the sample. Work at the University of Cincinnati was funded by the Strategic Environmental Research and Development Program WP-1619 and by UT-Battelle, LLC acting under U. S. Department of Energy Contract DE-AC05–00OR22725. The neutron reflectometry data were collected at the Asterix reflectometer at Lujan Neutron Scattering Center at Los Alamos National Laboratory (LANL) and at the LR Reflectometer at the Spallation Neutron Source at Oak Ridge National Laboratory. The Lujan Neutron Scattering Center was supported by LANL under DOE contract W7405-ENG-36, and by Office of Basic Energy Sciences, U. S. Department of Energy. The research at Oak Ridge is sponsored in part by the U. S. Department of Energy under Contract No. DE-AC05–00OR22725 with the Oak Ridge National Laboratory, which is managed by the UT-Battelle, LLC. Any opinion, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. We thank Jon Kevin Baldwin from LANL/CINT for preparation and characterization of the sample. Work at the University of Cincinnati was funded by the Strategic Environmental Research and Development Program WP-1619 and by UT-Battelle , LLC acting under U. S. Department of Energy Contract DE-AC05–00OR22725 . The neutron reflectometry data were collected at the Asterix reflectometer at Lujan Neutron Scattering Center at Los Alamos National Laboratory (LANL) and at the LR Reflectometer at the Spallation Neutron Source at Oak Ridge National Laboratory. The Lujan Neutron Scattering Center was supported by LANL under DOE contract W7405-ENG-36 , and by Office of Basic Energy Sciences, U. S. Department of Energy. The research at Oak Ridge is sponsored in part by the U. S. Department of Energy under Contract No. DE-AC05–00OR22725 with the Oak Ridge National Laboratory, which is managed by the UT-Battelle, LLC. Any opinion, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

Funders	Funder number
National Science Foundation
U.S. Department of Energy	W7405-ENG-36
Basic Energy Sciences
Oak Ridge National Laboratory
Los Alamos National Laboratory
Strategic Environmental Research and Development Program	WP-1619, DE-AC05–00OR22725

Keywords

Iron
Neutron reflectometry
Oxidation, Interfaces
X-ray reflectometry

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10.1016/j.tsf.2022.139464

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title = "Impact of ferromagnetism on neutron reflectometry of passivated iron",

abstract = "We compare polarized neutron reflectometry, non-polarized neutron reflectometry, and x-ray reflectometry for pure, magnetically polarized, air-passivated iron. Magnetism in the underlying metal enhances contrast with the surface oxide leading to precise magnetic and composition profiles of the oxide layer. The native passive film is a uniform, fully dense, non-ferromagnetic oxide with an average thickness of 31.9 ± 0.7 {\AA}. Non-polarized neutron reflectometry gives substantial errors in the inferred interfacial profiles.",

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author = "Jingxing Feng and Browning, {James F.} and Fitzsimmons, {M. R.} and Qiang Wang and Jaroslaw Majewski and Peng Wang and Schaefer, {Dale W.}",

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AU - Feng, Jingxing

AU - Browning, James F.

AU - Fitzsimmons, M. R.

AU - Wang, Qiang

AU - Majewski, Jaroslaw

AU - Wang, Peng

AU - Schaefer, Dale W.

PY - 2022/10/1

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AB - We compare polarized neutron reflectometry, non-polarized neutron reflectometry, and x-ray reflectometry for pure, magnetically polarized, air-passivated iron. Magnetism in the underlying metal enhances contrast with the surface oxide leading to precise magnetic and composition profiles of the oxide layer. The native passive film is a uniform, fully dense, non-ferromagnetic oxide with an average thickness of 31.9 ± 0.7 Å. Non-polarized neutron reflectometry gives substantial errors in the inferred interfacial profiles.

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KW - X-ray reflectometry

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Impact of ferromagnetism on neutron reflectometry of passivated iron

Abstract

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Keywords

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