First principles modeling of tunnel magnetoresistance of Fe/MgO/Fe trilayers |
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Authors: | Waldron Derek Timoshevskii Vladimir Hu Yibin Xia Ke Guo Hong |
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Institution: | Centre for the Physics of Materials and Department of Physics, McGill University, Montreal, PQ, H3A 2T8, Canada. |
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Abstract: | We report ab initio calculations of nonequilibrium quantum transport properties of Fe/MgO/Fe trilayer structures. The zero bias tunnel magnetoresistance is found to be several thousand percent, and it is reduced to about 1000% when the Fe/MgO interface is oxidized. The tunnel magnetoresistance for devices without oxidization reduces monotonically to zero with a voltage scale of about 0.5-1 V, consistent with experimental observations. We present an understanding of the nonequilibrium transport by investigating microscopic details of the scattering states and the Bloch bands of the Fe leads. |
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