Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-07-31
J. Magn. Magn. Mater. 305 (2006) 141
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 3 figures
Scientific paper
10.1016/j.jmmm.2005.12.001
Using a quantum theory including spin-splitting effect in diluted magnetic semiconductors, we study the dependence of tunneling magnetoresistance (TMR) on barrier thickness, temperature and applied voltage in GaMnAs/GaAs/GaMnAs heterostructures. TMR ratios more than 65% are obtained at zero temperature, when one GaAs monolayer ($\approx$ 0.565 nm) is used as a tunnel barrier. It is also shown that the TMR ratio decreases rapidly with increasing the barrier thickness and applied voltage, however at high voltages and low thicknesses, the TMR first increases and then decreases. Our model calculations well explain the main features of the recent experimental observations.
Saffarzadeh Alireza
Shokri Ali A.
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