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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:183

Article

Moser, A ; Krey, U ; Paintner, A ; Zellermann, B

关键词: giant magnetoresistance effect;    magnetic multilayers;    ab initio calculations;   

DOI  :  10.1016/S0304-8853(97)01090-1

来源: Elsevier

【 摘 要 】

In a self-consistent semi-empirical numerical approach based on ab-initio calculations for small samples, we evaluate the GMR effect for disordered (0 0 1)-(3-Fe/3-V)(infinity) 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'). (C) 1998 Elsevier Science B.V. All rights reserved.

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