Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-12-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 4 figures (in postscript format). PACS numbers: 72.25.-b, 73.23.-b, 72.10.Di
Scientific paper
10.1063/1.1703825
In this paper we analyze different contributions to the magnetoresistance of magnetic tunneling junctions at low voltages. A substantial fraction of the resistance drop with voltage can be ascribed to variations of the density of states and the barrier transmission with the bias. However, we found that the anomaly observed at zero bias and the magnetoresistance behavior at very small voltages, point to the contribution of inelastic magnon-assisted tunneling. The latter is described by a transfer parameter $T^{J}$, which is one or two orders of magnitude smaller than $T^{d}$, the direct transmission for elastic currents. Our theory is in excellent agreement with experimental data, yielding estimated values of $T^{J}$ which are of the order of $T^{d}$ / $T^{J}$ ~ 40.
Cabrera Guillermo
Dartora Cesar A.
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