Cation- and lattice-site-selective magnetic depth profiles of ultrathin Fe3O4 (001) films
Abstract
A detailed understanding of ultrathin film surface properties is crucial for the proper interpretation of spectroscopic, catalytic, and spin-transport data. We present x-ray magnetic circular dichroism (XMCD) and x-ray resonant magnetic reflectivity (XRMR) measurements on ultrathin Fe3O4 films to obtain magnetic depth profiles for the three resonant energies corresponding to the different cation species , , and located on octahedral and tetrahedral sites of the inverse spinel structure of Fe3O4. By analyzing the XMCD spectrum of Fe3O4 using multiplet calculations, the resonance energy of each cation species can be isolated. Performing XRMR on these three resonant energies yields magnetic depth profiles that each correspond to one specific cation species. The depth profiles of both kinds of Fe3+ cations reveal a (3.9 ± 1.0) -Å -thick surface layer of enhanced magnetization, which is likely due to an excess of these ions at the expense of the species in the surface region. The magnetically enhanced layer is additionally shifted about 2.9 ± 0.4 Å farther from the surface than the layer.
- Authors:
-
- Osnabrück University, Osnabrück (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Photon Science
- Bielefeld University, Bielefeld (Germany). Center for Spinelectronic Materials and Devices
- Osnabrück University, Osnabrück (Germany)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Photon Science
- Helmholtz-Zentrum Berlin (HZB), (Germany)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Bundesministerium für Bildung und Forschung; German Research Foundation (DFG)
- OSTI Identifier:
- 1823047
- Grant/Contract Number:
- AC02-05CH11231; KU2321/6-1; WO533/20-1
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 22; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Pohlmann, Tobias, Kuschel, Timo, Rodewald, Jari, Thien, Jannis, Ruwisch, Kevin, Bertram, Florian, Weschke, Eugen, Shafer, Padraic, Wollschläger, Joachim, and Küpper, Karsten. Cation- and lattice-site-selective magnetic depth profiles of ultrathin Fe3O4 (001) films. United States: N. p., 2020.
Web. doi:10.1103/physrevb.102.220411.
Pohlmann, Tobias, Kuschel, Timo, Rodewald, Jari, Thien, Jannis, Ruwisch, Kevin, Bertram, Florian, Weschke, Eugen, Shafer, Padraic, Wollschläger, Joachim, & Küpper, Karsten. Cation- and lattice-site-selective magnetic depth profiles of ultrathin Fe3O4 (001) films. United States. https://doi.org/10.1103/physrevb.102.220411
Pohlmann, Tobias, Kuschel, Timo, Rodewald, Jari, Thien, Jannis, Ruwisch, Kevin, Bertram, Florian, Weschke, Eugen, Shafer, Padraic, Wollschläger, Joachim, and Küpper, Karsten. Thu .
"Cation- and lattice-site-selective magnetic depth profiles of ultrathin Fe3O4 (001) films". United States. https://doi.org/10.1103/physrevb.102.220411. https://www.osti.gov/servlets/purl/1823047.
@article{osti_1823047,
title = {Cation- and lattice-site-selective magnetic depth profiles of ultrathin Fe3O4 (001) films},
author = {Pohlmann, Tobias and Kuschel, Timo and Rodewald, Jari and Thien, Jannis and Ruwisch, Kevin and Bertram, Florian and Weschke, Eugen and Shafer, Padraic and Wollschläger, Joachim and Küpper, Karsten},
abstractNote = {A detailed understanding of ultrathin film surface properties is crucial for the proper interpretation of spectroscopic, catalytic, and spin-transport data. We present x-ray magnetic circular dichroism (XMCD) and x-ray resonant magnetic reflectivity (XRMR) measurements on ultrathin Fe3O4 films to obtain magnetic depth profiles for the three resonant energies corresponding to the different cation species F e o c t 2 + , F e t e t 3 + , and F e o c t 3 + located on octahedral and tetrahedral sites of the inverse spinel structure of Fe3O4. By analyzing the XMCD spectrum of Fe3O4 using multiplet calculations, the resonance energy of each cation species can be isolated. Performing XRMR on these three resonant energies yields magnetic depth profiles that each correspond to one specific cation species. The depth profiles of both kinds of Fe3+ cations reveal a (3.9 ± 1.0) -Å -thick surface layer of enhanced magnetization, which is likely due to an excess of these ions at the expense of the F e o c t 2 + species in the surface region. The magnetically enhanced F e t e t 3 + layer is additionally shifted about 2.9 ± 0.4 Å farther from the surface than the F e o c t 3 + layer.},
doi = {10.1103/physrevb.102.220411},
journal = {Physical Review B},
number = 22,
volume = 102,
place = {United States},
year = {Thu Dec 24 00:00:00 EST 2020},
month = {Thu Dec 24 00:00:00 EST 2020}
}
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