Magnetoelectric properties of epitaxial Fe3O4 thin films on (011) PMN-PT piezosubstrates

Alexander Tkach, Mehrdad Baghaie Yazdi, Michael Foerster, Felix Büttner, Mehran Vafaee, Maximilian Fries, and Mathias Kläui
Phys. Rev. B 91, 024405 – Published 7 January 2015

Abstract

We determine the magnetic and magnetotransport properties of 33 nm thick Fe3O4 films epitaxially deposited by rf-magnetron sputtering on unpoled (011) [PbMg1/3Nb2/3O3]0.68[PbTiO3]0.32 (PMN-PT) substrates. The magnetoresistance (MR), as well as the magnetization reversal, strongly depend on the in-plane crystallographic direction of the epitaxial (011) Fe3O4 film and strain. When the magnetic field is applied along [100], the magnetization loops are slanted and the sign of the longitudinal MR changes from positive to negative around the Verwey transition at 125 K on cooling. Along the [011¯] direction, the loops are square shaped and the MR is negative above the switching field across the whole temperature range, just increasing in absolute value when cooling from 300 K to 150 K. The value of the MR is found to be strongly affected by poling the PMN-PT substrate, decreasing in the [100] direction and slightly increasing in the [011¯] direction upon poling, which results in a strained film.

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  • Received 2 February 2014
  • Revised 17 December 2014

DOI:https://doi.org/10.1103/PhysRevB.91.024405

©2015 American Physical Society

Authors & Affiliations

Alexander Tkach1,2, Mehrdad Baghaie Yazdi3, Michael Foerster1,4, Felix Büttner1,5, Mehran Vafaee1,3, Maximilian Fries3, and Mathias Kläui1

  • 1Institute of Physics, Johannes Gutenberg University, Staudingerweg 7, 55128 Mainz, Germany
  • 2Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-093 Aveiro, Portugal
  • 3Institute of Materials Science, Technical University of Darmstadt, Petersenstrasse 23, 64287 Darmstadt, Germany
  • 4ALBA Synchrotron Light Source, Carretera BP 1413, km. 3.3, Cerdanyola del Valles 08290, Spain
  • 5Institut of Optics and Atomic Physics, Technical University of Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany

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Vol. 91, Iss. 2 — 1 January 2015

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