Ballistic versus diffusive magnetoresistance of a magnetic point contact

Details Ballistic versus diffusive magnetoresistance of a magnetic point contact Ballistic versus diffusive magnetoresistance of a magnetic point contact

2002-07-26

arxiv.org/abs/cond-mat/0207648v1

Phys. Rev. B 63 (2001) 104428

Physics

Condensed Matter

Materials Science

4 pages, TEX, 1 Figure

Scientific paper

10.1103/PhysRevB.63.104428

The quasiclassical theory of a nanosize point contacts (PC) between two ferromagnets is developed. The maximum available magnetoresistance values in PC are calculated for ballistic versus diffusive transport through the area of a contact. In the ballistic regime the magnetoresistance in excess of few hundreds percents is obtained for the iron-group ferromagnets. The necessary conditions for realization of so large magnetoresistance in PC, and the experimental results by Garcia et al are discussed

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