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arxiv: 1308.2072 · v1 · pith:6ZEQDOHOnew · submitted 2013-08-09 · ❄️ cond-mat.mtrl-sci

High TMR ratio in Co2FeSi and Fe2CoSi based magnetic tunnel junctions

Christian Sterwerf , Markus Meinert , Jan-Michael Schmalhorst , G\"unter Reiss This is my paper
classification ❄️ cond-mat.mtrl-sci
keywords tunnelhighjunctionsmagnetictemperaturewereadjustmentamplitude
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Magnetic tunnel junctions with Fe1+xCo2-xSi (0 < x < 1) electrodes and MgO barrier were prepared on MgO substrates by magnetron co-sputtering. Maximum tunnel magnetoresistance (TMR) ratios of 262 % at 15 K and 159 % at room temperature were observed for x=0.75. Correlations of the annealing temperature dependent atomic ordering and TMR amplitude are discussed. The high TMR for an intermediate stoichiometry is ascribed to the adjustment of the Fermi energy within a minority spin pseudo gap.

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