期刊
APPLIED PHYSICS LETTERS
卷 99, 期 10, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3634026
关键词
boron alloys; cobalt alloys; interface magnetism; iron alloys; magnesium compounds; perpendicular magnetic anisotropy; rapid thermal annealing; tunnelling magnetoresistance
资金
- NSF [DMR05-20491]
- DOE [DE-FG02-07ER46374]
The tunneling magnetoresistance and perpendicular magnetic anisotropy in CoFeB(1.1-1.2 nm)/MgO/CoFeB(1.2-1.7 nm) junctions were found to be very sensitively dependent on annealing time. During annealing at a given temperature, decay of magnetoresistance occurs much earlier compared to junctions with in-plane magnetic anisotropy. Through a rapid thermal annealing study, the decrease of magnetoresistance is found to be associated with the degradation of perpendicular anisotropy, instead of impurity diffusion as observed in common in-plane junctions. The origin of the evolution of perpendicular anisotropy as well as possible means to further enhance tunneling magnetoresistance is discussed. (C) 2011 American Institute of Physics. [doi:10.1063/1.3634026]
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