Giant magnetoresistance in nanoscale ferromagnetic heterocontacts

Abstract

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.

arXiv comment10 pages, 4 figures

References in corpus (8)

• Geometrically constrained magnetic wall
• Conductance Quantization and Magnetoresistance in Magnetic Point Contacts
• Ballistic magnetoresistance in nickel single-atom conductors
• Ballistic versus diffusive magnetoresistance of a magnetic point contact
• Multivalued dependence of the magnetoresistance on the quantized conductance in nanosize magnetic contacts
• Transition to linear domain walls in nano-constrictions
• Electronic transport through domain walls in ferromagnetic nanowires: Co-existence of adiabatic and non-adiabatic spin dynamics
• Enhanced Spin Polarization of Conduction Electrons in Ni, explained by comparison with Cu

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• Tunnel magnetoresistance and temperature related effects in magnetic tunnel junctions with embedded nanoparticles