Giant magnetoresistance in nanoscale ferromagnetic heterocontacts

Details Giant magnetoresistance in nanoscale ferromagnetic heterocontacts Giant magnetoresistance in nanoscale ferromagnetic heterocontacts

2007-06-02

arxiv.org/abs/0706.0266v1

J. Phys.: Condens. Matter 19 (2007) 196215

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 4 figures

Scientific paper

10.1088/0953-8984/19/19/196215

A quasiclassical theory of giant magnetoresistance in nanoscale point contacts between different ferromagnetic metals is developed. The contacts were sorted by three types of mutual positions of the conduction spin-subband bottoms which are shifted one against another by the exchange interaction. A model of linear domain wall has been used to account for the finite contact length. The magnetoresistance is plotted against the size of the nanocontact. In heterocontacts the magnetoresistance effect turned out to be not only negative, as usual, but can be positive as well. Relevance of the results to existing experiments on GMR in point heterocontacts is discussed.

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