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

Tkach, Alexander and Baghaie Yazdi, Mehrdad and Foerster, Michael and Büttner, Felix and Vafaee, Mehran and Fries, Maximilian and Kläui, Mathias (2015):
Magnetoelectric properties of epitaxial Fe3O4 thin films on (011) PMN-PT piezosubstrates.
In: Physical Review B, APS Publications, pp. 024405, 91, (2), ISSN 1098-0121, [Online-Edition: http://dx.doi.org/10.1103/PhysRevB.91.024405],
[Article]

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.

Item Type: Article
Erschienen: 2015
Creators: Tkach, Alexander and Baghaie Yazdi, Mehrdad and Foerster, Michael and Büttner, Felix and Vafaee, Mehran and Fries, Maximilian and Kläui, Mathias
Title: Magnetoelectric properties of epitaxial Fe3O4 thin films on (011) PMN-PT piezosubstrates
Language: English
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.

Journal or Publication Title: Physical Review B
Volume: 91
Number: 2
Publisher: APS Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
Date Deposited: 21 Apr 2015 09:33
Official URL: http://dx.doi.org/10.1103/PhysRevB.91.024405
Identification Number: doi:10.1103/PhysRevB.91.024405
Funders: This work was funded by the EU's 7th Framework Program IFOX (NMP3-LA-2010 246102), the Graduate School of Excellence MAINZ (GSC 266 Mainz), the German Science Foundation (DFG), and the ERC (2007-Stg 208162)., A.T. acknowledges also funds by FEDER through Programa Operacional Factores de Competitividade–COMPETE and national funds through FCT–Fundação para aCiência e Tecnologia within the CICECO project FCOMP-01-0124-FEDER-037271(FCT Ref. PEst-C/CTM/LA0011/2013, And A.T. acknowledges also independent researcher grant IF/00602/2013.
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