Physics – Condensed Matter – Materials Science
Scientific paper
2001-10-30
Phys. Rev. B 66, 064416 (2002).
Physics
Condensed Matter
Materials Science
9 pages, 2 figures, accepted in PRB
Scientific paper
10.1103/PhysRevB.66.064416
We revisit the theory of magnetoresistance for a system of nanoscopic magnetic granules in metallic matrix. Using a simple model for the spin dependent perturbation potential of the granules, we solve Boltzmann equation for the spin dependent components of the non equilibrium electronic distribution function. For typical values of the geometric parameters in granular systems, we find a peculiar structure of the distribution function of conduction electrons, which is at variance with the two-current model of conduction in inhomogeneous systems. Our treatment explicitly includes the effects of dipolar correlations yielding a magnetoresistance ratio which contains, in addition to the term proportional to the square of uniform magnetization (< {\boldsymbol \mu} >), a weak anisotropic contribution depending on the angle between electric and magnetic fields, and arising from the anisotropic character of dipolar interactions.
dos Santos Joao M. B. Lopes
Lopes João Viana
Pogorelov Yu. G.
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