Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-05-30
J. Phys.: Condens. Matter 15 (2003) 3041-51
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 5 PS figures
Scientific paper
10.1088/0953-8984/15/19/307
We consider a new type of magnetic tunnel junction, which consists of two ferromagnetic tunnel barriers acting as spin filters (SFs), separated by a nonmagnetic metal (NM) layer. Using the transfer matrix method and the free-electron approximation, the dependence of the tunnel magnetoresistance (TMR) on the thickness of the central NM layer, bias voltage and temperature in the double SF junction are studied theoretically. It is shown that the TMR and electron-spin polarization in this structure can reach very large values under suitable conditions. The highest value of the TMR can reach 99%. By an appropriate choice of the thickness of the central NM layer, the degree of spin polarization in this structure will be higher than that of the single SF junctions. These results may be useful in designing future spin-polarized tunnelling devices.
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