RT Journal Article
T1 Interfacial effects on the tunneling magnetoresistance in La_(0.7)Sr_(0.3)MnO_(3)/MgO/Fe tunneling junctions
A1 Galceran, R.
A1 Balcells, Ll.
A1 Martínez-Boubeta, C.
A1 Bozzo, B.
A1 Cisneros-Fernández, J.
A1 Mata, M. de la
A1 Magén, C.
A1 Arbiol, J.
A1 Tornos, J.
A1 Cuéllar Jiménez, Fabian Andrés
A1 Sefrioui, Zouhair
A1 Cebollada, A.
A1 Golmar, F.
A1 Huesos, L.E.
A1 Casanova, F.
A1 Santamaría Sánchez-Barriga, Jacobo
A1 Martínez, B.
AB We report on magnetotransport properties on La_(0.7)Sr_(0.3)MnO_(3)/MgO/Fe tunnel junctions grown epitaxially on top of (001)-oriented SrTiO_(3) substrates by sputtering. It is shown that the magnetoresistive response depends critically on the MgO/Fe interfacial properties. The appearance of an FeOX layer by the interface destroys the 1 symmetry filtering effect of the MgO/Fe system and only a small negative tunneling magnetoresistance (TMR) (∼ −3 %) is measured. However, in annealed samples a switchover from positive TMR (∼ +25% at 70 K) to negative TMR (∼ −1 %) is observed around 120 K. This change is associated with the transition from semiconducting at high T to insulating at low T taking place at the Verwey transition (TV ∼ 120 K) in Fe3O4, thus suggesting the formation of a very thin slab of magnetite at the MgO/Fe interface during annealing treatments. These results highlight the relevance of interfacial properties on the tunneling conduction process and how it can be substantially modified through appropriate interface engineering.
PB American Physical Society
SN 1098-0121
YR 2015
FD 2015-09-16
LK https://hdl.handle.net/20.500.14352/24217
UL https://hdl.handle.net/20.500.14352/24217
LA eng
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NO © 2015 American Physical Society. We acknowledge financial support from the Spanish MINECO through grants (MAT2012-33207, MAT2011- 27470-C02, MAT2012-37638 and Consolider Ingenio 2010 - CSD2009-00013 (Imagine)), from CAM through Grant No. S2009/MAT-1756 (Phama) and Basque Government (PI2011- 1). Financial support from EC through FEDER program and Marie Curie Actions (256470-ITAMOSCINOM) is also acknowledged. C.M.B. thanks the Spanish MINECO for the financial support through the RyC program. The authors would like to thank the technical staff of the ICMAB for their assistance
NO Comunidad de Madrid
NO Ministerio de Economía y Competitividad (MINECO)
NO Basque Government
NO FEDER program
NO Marie Curie Actions
DS Docta Complutense
RD 29 abr 2024