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Title: Evolution of electronic and magnetic properties of nominal magnetite nanoparticles at high pressure probed by x-ray absorption and emission techniques

Abstract

Here, we present a study of electronic and magnetic properties of nominal magnetite nanoparticles (NPs) (~6 nm) at high pressure in the presence of silicon pressure medium using x-ray absorption near edge structure (XANES), x-ray magnetic circular dichroism (XMCD) and non-resonant x-ray emission spectroscopy (XES). XANES data show a reduction of Fe charge state, a change in local environment around Fe at tetrahedral sites, and a reduced occupation of Fe 4 p orbitals, not seen in previous pressure studies of bulk magnetite. XMCD data show a continuous magnetic moment reduction of ~50% between ambient pressure and 20 GPa, similar to what was observed in previous bulk magnetite studies. XES spectra of NPs indicate a gradual change in spin configuration away from the high-spin state consistent with a postulated charge transfer from Fe 4 p to 3 d states and the observed reduction in XMCD signal. Taken together, the results point to substantial differences in the response of electronic and magnetic properties of the nano-counterparts of bulk magnetite at high pressure.

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [4];  [5]
  1. Univ. of Maine, Orono, ME (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Brazilian Synchrotron Light Lab. (LNLS), Campinas, SP (Brazil)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Univ. of Washington, Seattle, WA (United States)
  5. Carnegie Inst. of Washington, Washington, D.C. (United States); Carnegie Inst. of Washington, Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Argonne National Laboratory, Advanced Photon Source; USDOE
OSTI Identifier:
1508518
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 31; Journal Issue: 25; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; diamond anvil cells; high pressure physics; magnetite nanoparticles; x-ray absorption spectroscopy; x-ray emission spectroscopy; x-ray magnetic circular dichroism

Citation Formats

Werellapatha, Kalpani, Escanhoela, Carlos A., Fabbris, Gilberto, Haskel, Daniel, Ankudinov, Alexei, and Chow, Paul. Evolution of electronic and magnetic properties of nominal magnetite nanoparticles at high pressure probed by x-ray absorption and emission techniques. United States: N. p., 2019. Web. doi:10.1088/1361-648X/ab111d.
Werellapatha, Kalpani, Escanhoela, Carlos A., Fabbris, Gilberto, Haskel, Daniel, Ankudinov, Alexei, & Chow, Paul. Evolution of electronic and magnetic properties of nominal magnetite nanoparticles at high pressure probed by x-ray absorption and emission techniques. United States. doi:10.1088/1361-648X/ab111d.
Werellapatha, Kalpani, Escanhoela, Carlos A., Fabbris, Gilberto, Haskel, Daniel, Ankudinov, Alexei, and Chow, Paul. Mon . "Evolution of electronic and magnetic properties of nominal magnetite nanoparticles at high pressure probed by x-ray absorption and emission techniques". United States. doi:10.1088/1361-648X/ab111d.
@article{osti_1508518,
title = {Evolution of electronic and magnetic properties of nominal magnetite nanoparticles at high pressure probed by x-ray absorption and emission techniques},
author = {Werellapatha, Kalpani and Escanhoela, Carlos A. and Fabbris, Gilberto and Haskel, Daniel and Ankudinov, Alexei and Chow, Paul},
abstractNote = {Here, we present a study of electronic and magnetic properties of nominal magnetite nanoparticles (NPs) (~6 nm) at high pressure in the presence of silicon pressure medium using x-ray absorption near edge structure (XANES), x-ray magnetic circular dichroism (XMCD) and non-resonant x-ray emission spectroscopy (XES). XANES data show a reduction of Fe charge state, a change in local environment around Fe at tetrahedral sites, and a reduced occupation of Fe 4p orbitals, not seen in previous pressure studies of bulk magnetite. XMCD data show a continuous magnetic moment reduction of ~50% between ambient pressure and 20 GPa, similar to what was observed in previous bulk magnetite studies. XES spectra of NPs indicate a gradual change in spin configuration away from the high-spin state consistent with a postulated charge transfer from Fe 4p to 3d states and the observed reduction in XMCD signal. Taken together, the results point to substantial differences in the response of electronic and magnetic properties of the nano-counterparts of bulk magnetite at high pressure.},
doi = {10.1088/1361-648X/ab111d},
journal = {Journal of Physics. Condensed Matter},
number = 25,
volume = 31,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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This content will become publicly available on April 8, 2020
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