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Evidence of a barrier oxidation dependence on the interfacial magnetism in Co/alumina based magnetic tunnel junctions

Telling, N. D., Van der Laan, G., Ladak, Sam, Hicken, R. J. and Arenholz, E. 2006. Evidence of a barrier oxidation dependence on the interfacial magnetism in Co/alumina based magnetic tunnel junctions. Journal of Applied Physics 99 (8) , 08E-505. 10.1063/1.2171002

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Abstract

Soft x-ray absorption spectroscopy and magnetic circular dichroism at the Co L2,3 edge have been applied to explore the near-interfacial magnetism of Co electrodes in Co/alumina based magnetic tunnel junctions. By taking into account the formation of CoO at the ferromagnetic (FM)/barrier interface, the change in the total magnetic moment on metallic Co atoms as a function of barrier oxidation has been determined. The results demonstrate a strong correlation between the Co moments and measured TMR values, and an enhancement in the Co moments for moderate oxidation times.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: cobalt, alumina, ferromagnetic materials, electrodes, oxidation, interface magnetism, tunnelling magnetoresistance, X-ray absorption, magnetic circular dichroism, magnetic moments
Additional Information: PROCEEDINGS OF THE 50TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Spin Polarized Tunneling and Interfaces. Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0021-8979/ (accessed 21/02/2014).
Publisher: American Institute of Physics
ISSN: 0021-8979
Date of First Compliant Deposit: 30 March 2016
Last Modified: 22 Oct 2018 13:00
URI: http://orca.cf.ac.uk/id/eprint/35179

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