Dipolar interactions and anisotropic magnetoresistance in metallic granular systems

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dc.creatorLopes, J. Viana
dc.creatorSantos, J. M. B. Lopes dos
dc.creatorPogorelov, Yu. G.
dc.date2001-10-30
dc.date2002-07-09
dc.date.accessioned2026-07-07T06:27:29Z
dc.date.available2026-07-07T06:27:29Z
dc.descriptionWe 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 μ} >), a weak anisotropic contribution depending on the angle between electric and magnetic fields, and arising from the anisotropic character of dipolar interactions.
dc.description9 pages, 2 figures, accepted in PRB
dc.identifierhttps://arxiv.org/abs/cond-mat/0110622
dc.identifierhttp://arxiv.org/abs/cond-mat/0110622
dc.identifierPhys. Rev. B 66, 064416 (2002).
dc.identifierdoi:10.1103/PhysRevB.66.064416
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97429
dc.subjectMaterials Science
dc.titleDipolar interactions and anisotropic magnetoresistance in metallic granular systems
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