Even-odd effects in magnetoresistance of ferromagnetic domain walls

Details Even-odd effects in magnetoresistance of ferromagnetic domain walls Even-odd effects in magnetoresistance of ferromagnetic domain walls

2002-08-23

arxiv.org/abs/cond-mat/0208463v1

Physics

Condensed Matter

Materials Science

4 pages, 2 figures, ReVTeX

Scientific paper

10.1103/PhysRevB.67.100402

Difference in density of states for the spin's majority and minority bands in a ferromagnet changes the electrostatic potential along the domains, introducing the discontinuities of the potential at domain boundaries. The value of discontinuity oscillates with number of domains. Discontinuity depends on the positions of domain walls, their motion or collapse of domain walls in applied magnetic field. Large values of magnetoresistance are explained in terms of spin-accumulation. We suggest a new type of domain walls in nanowires of itinerant ferromagnets, in which the magnetization vector changes without rotation. Absence of transverse magnetization components allows considerable spin accumulation assuming the spin relaxation length, L_S, is large enough.

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