Electron interaction with domain walls in antiferromagnetically coupled multilayers

F. G. Aliev; R. Schad; A. Volodin; K. Temst; C. Van Haesendonck; Y. Bruynseraede; I. Vavra; V. K. Dugaev; R. Villar

doi:10.1209/epl/i2003-00597-2

All issues

Volume 63 / No 6 (September 2003)

Europhys. Lett., 63 6 (2003) 888-894

Abstract

Issue		Europhys. Lett. Volume 63, Number 6, September 2003


Page(s)		888 - 894
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2003-00597-2
Published online		01 November 2003

Europhys. Lett., 63 (6), pp. 888-894 (2003)

Electron interaction with domain walls in antiferromagnetically coupled multilayers

F. G. Aliev¹, R. Schad², A. Volodin³, K. Temst³, C. Van Haesendonck³, Y. Bruynseraede³, I. Vavra⁴, V. K. Dugaev⁵ and R. Villar¹

¹ Departamento de Física de la Materia Condensada, C-III Universidad Autónoma de Madrid - Madrid, Spain
² CMIT, University of Alabama - Tuscaloosa, AL 35487, USA
³ Laboratorium voor vaste Stofffysica en Magnetisme, K.U. Leuven B-3001 Leuven, Belgium
⁴ Institute of Electrical Engineering-SAS - 84239 Bratislava, Slovakia
⁵ Max-Planck-Institut für Mikrostrukturphysik - Weinberg 2, 06120 Halle, Germany

Received: 2 May 2003
Accepted: 4 July 2003

Abstract

For antiferromagnetically coupled $\chem{Fe/Cr}$ multilayers the low-field contribution to the resistivity $\rho_{\ab{DW}}$ , which is caused by the domain walls, is strongly enhanced at low temperatures. The low-temperature resistivity $\rho_{\ab{DW}}$ varies according to a power law, $\rho_{\ab{DW}}(T)=\rho_{\ab{DW}}(0)-A\cdot T^\alpha$ with the exponent $\alpha \simeq 0.7$ –1. This behavior cannot be explained assuming ballistic electron transport through the domain walls. It is necessary to invoke the suppression of anti-localization effects (positive quantum correction to conductivity) by the non-uniform gauge fields caused by the domain walls.

PACS: 75.60.-d – Domain effects, magnetization curves, and hysteresis / 75.70.-i – Magnetic properties of thin films, surfaces, and interfaces / 75.47.De – Giant magnetoresistance

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