Ab-initio-calculations of the GMR-effect in Fe/V multilayers

Details Ab-initio-calculations of the GMR-effect in Fe/V multilayers Ab-initio-calculations of the GMR-effect in Fe/V multilayers

1997-11-04

arxiv.org/abs/cond-mat/9711027v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

LaTex, 30 pages, including 16 drawings; to appear in JMMM

Scientific paper

10.1016/S0304-8853(97)01090-1

In a self-consistent semi-empirical numerical approach based on ab-initio-calculations for small samples, we evaluate the GMR effect for disordered (001)-(3--Fe/3--V)$_\infty$ multilayers by means of a Kubo formalism. We consider four different types of disorder arrangements: In case (i) and (ii), the disorder consists in the random interchange of some Fe and V atoms, respectively, at interface layers; in case (iii) in the formation of small groups of three substitutional Fe atoms in a V interface layer and a similar V group in a Fe layer at a different interface; and for case (iv) in the substitution of some V atoms in the innermost V layers by Fe. For cases (i) and (ii), depending on the distribution of the impurities, the GMR effect is enhanced or reduced by increasing disorder, in case (iii) the GMR effect is highest, whereas finally, in case (iv), a negative GMR is obtained (''inverse GMR'').

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