GaMnAs-based magnetic tunnel junctions with an AlMnAs barrier

Ohya, Shinobu; Muneta, Iriya; Hai, Pham Nam; Tanaka, Masaaki
December 2009
Applied Physics Letters;12/14/2009, Vol. 95 Issue 24, p242503
Academic Journal
We investigate the spin-dependent transport of GaMnAs-based magnetic tunnel junctions (MTJs) containing a paramagnetic AlMnAs barrier with various thicknesses. The barrier height of AlMnAs with respect to the Fermi level of GaMnAs is estimated to be 110 meV. We observe tunneling magnetoresistance (TMR) ratios up to 175% (at 2.6 K), which is higher than those of the GaMnAs-based MTJs with other barrier materials in the same temperature region. These high TMR ratios can be mainly attributed to the relatively high crystal quality of AlMnAs and the suppression of the tunneling probability at the in-plane wave vector k∥∼0.


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