Temperature dependent resistance of magnetic tunnel junctions as a quality proof of the barrier | Zendy

U. Rüdiger | Zendy; Raffaella Calarco | Zendy; U. May | Zendy; K. Samm | Zendy; Jens Hauch | Zendy; Harish M. Kittur | Zendy; Martin Sperlich | Zendy; G. Güntherodt | Zendy

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Temperature dependent resistance of magnetic tunnel junctions as a quality proof of the barrier

Author(s) -

U. Rüdiger,

Raffaella Calarco,

U. May,

K. Samm,

Jens Hauch,

Harish M. Kittur,

Martin Sperlich,

G. Güntherodt

Publication year - 2001

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.1361055

Subject(s) - quantum tunnelling , tunnel magnetoresistance , materials science , magnetoresistance , x ray photoelectron spectroscopy , tunnel junction , tunnel effect , optoelectronics , molecular beam epitaxy , shadow mask , rectangular potential barrier , condensed matter physics , analytical chemistry (journal) , chemistry , nuclear magnetic resonance , epitaxy , nanotechnology , optics , magnetic field , physics , layer (electronics) , quantum mechanics , chromatography

Tunnel junctions of Co(10 nm)/AlOx (nominally 2 nm)/Co(20 nm) have been prepared by molecular beam epitaxy applying a shadow mask technique in conjunction with an UV light-assisted oxidation process of the AlOx barrier. The quality of the AlOx barrier has been proven by x-ray photoelectron spectroscopy and temperature dependent tunneling magnetoresistance (TMR) measurements. Optimum-oxidized tunnel junctions show a TMR of 20% at 285 K and up to 36% at 100 K. At 285 K the TMR values as a function of oxidation time are not symmetric about the optimum time. For underoxidized junctions the TMR is reduced more strongly than for overoxidized junctions. The temperature dependence of the junction’s resistance is a clear and reliable indicator whether pinholes (or imperfections) contribute to the conduction across the barrier.

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