Anomalous magnetoresistance behavior of CoFe nano-oxide spin valves at low temperatures

Details Anomalous magnetoresistance behavior of CoFe nano-oxide spin valves at low temperatures Anomalous magnetoresistance behavior of CoFe nano-oxide spin valves at low temperatures

2005-07-18

arxiv.org/abs/cond-mat/0507423v1

J. Ventura et al., J. Appl. Phys. 93, 7690 (2003)

Physics

Condensed Matter

Materials Science

4 pages; 3 figures

Scientific paper

10.1063/1.1540149

We report magnetoresistance curves of CoFe nano-oxide specular spin valves of MnIr/CoFe/nano-oxidized CoFe/CoFe/Cu/CoFe/nano-oxidized CoFe/Ta at different temperatures from 300 to 20 K. We extend the Stoner-Wolfarth model of a common spin valve to a specular spin valve, introducing the separation of the pinned layer into two sublayers and their magnetic coupling across the nano-oxide. We study the effect of different coupling/exchange (between the antiferromagnetic layer and the bottom sublayer) field ratios on the magnetization and magnetoresistance, corresponding with the experimentally observed anomalous bumps in low temperature magnetoresistance curves.

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