Ultrathin magnetite in Fe3O4/MgO superlattices: Investigating the enhanced thin film magnetic moment

Ozhet Mauit, Karsten Fleischer, Cormac Ó Coileáin, Brendan Bulfin, Daniel S. Fox, Christopher M. Smith, Daragh Mullarkey, Gulnar Sugurbekova, Hongzhou Zhang, and Igor V. Shvets
Phys. Rev. B 95, 125128 – Published 23 March 2017
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Abstract

The electrical, crystallographic, and magnetic properties of ultrathin magnetite (Fe3O4) have been studied in detail, by employing superlattice structures of Fe3O4/MgFe2O4 and Fe3O4/MgO on a variety of substrates. By careful analysis of their properties, the influence of substrate stoichiometry, Fe3O4 thin film thickness, antiphase boundaries on the magnetic properties can be separated. In particular, the controversial enhanced magnetic moment in ultrathin films (<5 nm) was confirmed to be related to the substrate stoichiometry, specifically the migration of oxygen vacancies into the Fe3O4 thin films. The multilayer concept can be employed with many other such systems and offers methods of tuning the properties of thin magnetic oxides.

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  • Received 29 September 2016
  • Revised 9 February 2017

DOI:https://doi.org/10.1103/PhysRevB.95.125128

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ozhet Mauit1,2,*, Karsten Fleischer1,†, Cormac Ó Coileáin1,3, Brendan Bulfin4, Daniel S. Fox1, Christopher M. Smith1, Daragh Mullarkey1, Gulnar Sugurbekova2, Hongzhou Zhang1, and Igor V. Shvets1

  • 1School of Physics and CRANN, Trinity College Dublin, The University of Dublin, Ireland
  • 2National Laboratory Astana, Nazarbayev University, Astana, Kazakhstan
  • 3KSU-Aramco Center, King Saud University, Riyadh 11451, Saudi Arabia
  • 4Institute of Solar Research, German Aerospace Center (DLR), 51147 Köln, Germany

  • *mauito@tcd.ie
  • fleisck@tcd.ie

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Issue

Vol. 95, Iss. 12 — 15 March 2017

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