Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO3(001)

Thien, Jannis; Bahlmann, Jascha; Alexander, Andreas; Ruwisch, Kevin; Rodewald, Jari; Pohlmann, Tobias; Hoppe, Martin; Alarslan, Fatih; Steinhart, Martin; Altuncevahir, Baki; Shafer, Padraic; Meyer, Carola; Bertram, Florian; Wollschläger, Joachim; Küpper, Karsten

doi:10.3390/ma15010046

Title: Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO₃(001)

Journal Article · Wed Dec 22 00:00:00 UTC 2021 · Materials

DOI: https://doi.org/10.3390/ma15010046 · OSTI ID:2469668

^[1]; Bahlmann, Jascha ^[1]; Alexander, Andreas ^[1];

^[1]; Rodewald, Jari ^[1]; Pohlmann, Tobias ^[2]; Hoppe, Martin ^[2]; Alarslan, Fatih ^[1];

^[1]; Altuncevahir, Baki ^[3];

^[4];

^[1];

^[5];

^[1];

^[1]

Univ. of Osnabruck (Germany)
Univ. of Osnabruck (Germany); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Istanbul Technical University (Turkey)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)

Here, we present the (element-specific) magnetic properties and cation ordering for ultrathin Co-rich cobalt ferrite films. Two Co-rich Co_xFe_3-xO₄ films with different stoichiometry (x=1.1 and x=1.4) have been formed by reactive solid phase epitaxy due to post-deposition annealing from epitaxial CoO/Fe₃O₄ bilayers deposited before on Nb-doped SrTiO₃(001). The electronic structure, stoichiometry and homogeneity of the cation distribution of the resulting cobalt ferrite films were verified by angle-resolved hard X-ray photoelectron spectroscopy. From X-ray magnetic circular dichroism measurements, the occupancies of the different sublattices were determined using charge-transfer multiplet calculations. For both ferrite films, a partially inverse spinel structure is found with increased amount of Co³⁺ cations in the low-spin state on octahedral sites for the Co_1.4Fe_1.6O₄ film. These findings concur with the results obtained by superconducting quantum interference device measurements. Further, the latter measurements revealed the presence of an additional soft magnetic phase probably due to cobalt ferrite islands emerging from the surface, as suggested by atomic force microscope measurements.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: German Research Foundation (DFG); USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2469668

Journal Information:: Materials, Journal Name: Materials Journal Issue: 1 Vol. 15; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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cationic distribution
cobalt ferrite
magnetic properties
ultrathin films

Title: Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO3(001)

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Title: Cationic Ordering and Its Influence on the Magnetic Properties of Co-Rich Cobalt Ferrite Thin Films Prepared by Reactive Solid Phase Epitaxy on Nb-Doped SrTiO₃(001)