期刊
APPLIED PHYSICS LETTERS
卷 95, 期 20, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3264968
关键词
cobalt compounds; hopping conduction; iron compounds; magnesium compounds; magnetic tunnelling; magnetoresistance; photolithography; spin dynamics; tunnelling
资金
- Science Foundation of Ireland (SFI)
- CRANN
- Walton Fellowship at Trinity College
Exchange-biased magnetic tunnel junctions with a CoFeB/MgO pinned layer, a Co free layer and an aluminum tris-(8-hydroxyquinoline) spacer layer of thickness ranging from 0-8 nm have been prepared by photolithography. The devices show a room-temperature, zero-bias magnetoresistance of 12.5 +/- 0.3%, which is unchanged after the crossover from tunneling to hopping transport at a barrier thickness of about 4 nm. The spin-diffusion length in the hopping regime is much greater than 10 nm. The magnetoresistance in the tunneling regime changes sign at a positive bias of 250 mV, and it is maximum at -100 mV.
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