Physics – Condensed Matter – Materials Science
Scientific paper
2006-09-13
Jpn. J. Appl. Phys., Vol.45 (2006) No.40 pp.L1057-L1060
Physics
Condensed Matter
Materials Science
16 pages, 4 figures. Jpn. J. Appl. Phys., in press
Scientific paper
10.1143/JJAP.45.L1057
We report the intrinsic critical current density (Jc0) in current-induced magnetization switching and the thermal stability factor (E/kBT, where E, kB, and T are the energy potential, the Boltzmann constant, and temperature, respectively) in MgO based magnetic tunnel junctions with a Co40Fe40B20(2nm)/Ru(0.7-2.4nm)/Co40Fe40B20(2nm) synthetic ferrimagnetic (SyF) free layer. We show that Jc0 and E/kBT can be determined by analyzing the average critical current density as a function of coercivity using the Slonczewski's model taking into account thermal fluctuation. We find that high antiferromagnetic coupling between the two CoFeB layers in a SyF free layer results in reduced Jc0 without reducing high E/kBT.
Hayakawa Jun
Ikeda Shoji
Lee Young Min
Matsukura Fumihiro
Meguro Toshiyasu
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