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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/40150

Title: Superparamagnetism in MgO-based magnetic tunnel junctions with a thin pinned ferromagnetic electrode
Author: COEY, JOHN MICHAEL DAVID
VENKATESAN, MUNUSWAMY
Sponsor: Science Foundation Ireland
Author's Homepage: http://people.tcd.ie/jcoey
http://people.tcd.ie/venkatem
Keywords: Physics
thin films
Issue Date: 2010
Citation: Feng, J. F.; Chen, J. Y.; Venkatesan, M.; Feng, G.; Han, X. F.; Coey, J. M. D., Superparamagnetism in MgO-based magnetic tunnel junctions with a thin pinned ferromagnetic electrode, Physical Review B (Condensed Matter and Materials Physics), 81, 2010, 205212-
Series/Report no.: Physical Review B (Condensed Matter and Materials Physics)
81
Abstract: MgO-based magnetic tunnel junctions have been fabricated with a thin Co40Fe40B20 (CoFeB) layer in the pinned synthetic antiferromagnetic CoFe/Ru/CoFeB stack. An inverted tunneling magnetoresistance is observed due to the unbalanced synthetic antiferromagnet. Superparamagnetic nanoparticles form when the CoFeB layer is thinner than 1.5 nm, and an abnormal temperature dependence of the junction resistance is associated with superparamagnetism when the thermal fluctuation energy exceeds the magnetic anisotropy energy. This explanation accounts for the temperature dependence of the tunneling magnetoresistance effect.
Description: PUBLISHED
URI: http://hdl.handle.net/2262/40150
Related links: http://link.aps.org/doi/10.1103/PhysRevB.81.205212
http://link.aps.org/doi/10.1103/PhysRevB.81.205212
Appears in Collections:Physics (Scholarly Publications)

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