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arXiv:1412.7356 (cond-mat)
[Submitted on 23 Dec 2014 (v1), last revised 10 Apr 2015 (this version, v2)]

Title:Sign change in the tunnel magnetoresistance of Fe3O4/MgO/Co-Fe-B magnetic tunnel junctions depending on the annealing temperature and the interface treatment

Authors:Luca Marnitz, Karsten Rott, Stefan Niehörster, Christoph Klewe, Daniel Meier, Savio Fabretti, Matthäus Witziok, Andreas Krampf, Olga Kuschel, Tobias Schemme, Karsten Kuepper, Joachim Wollschläger, Andy Thomas, Günter Reiss, Timo Kuschel
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Abstract:Magnetite (Fe3O4) is an eligible candidate for magnetic tunnel junctions (MTJs) since it shows a high spin polarization at the Fermi level as well as a high Curie temperature of 585°C. In this study, Fe3O4/MgO/Co-Fe-B MTJs were manufactured. A sign change in the TMR is observed after annealing the MTJs at temperatures between 200°C and 280°C. Our findings suggest an Mg interdiffusion from the MgO barrier into the Fe3O4 as the reason for the change of the TMR. Additionally, different treatments of the magnetite interface (argon bombardment, annealing at 200°C in oxygen atmosphere) during the preparation of the MTJs have been studied regarding their effect on the performance of the MTJs. A maximum TMR of up to -12% could be observed using both argon bombardment and annealing in oxygen atmosphere, despite exposing the magnetite surface to atmospheric conditions before the deposition of the MgO barrier.
Comments: 5 pages, 5 figures, 2 tables
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:1412.7356 [cond-mat.mtrl-sci]
  (or arXiv:1412.7356v2 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.1412.7356
Journal reference: AIP Advances 5, 047103 (2015)
Related DOI: https://doi.org/10.1063/1.4917018

Submission history

From: Luca Marnitz [view email]
[v1] Tue, 23 Dec 2014 13:12:41 UTC (333 KB)
[v2] Fri, 10 Apr 2015 09:08:16 UTC (336 KB)
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