Journal of the Physical Society of Japan
        Vol.69 No.7, July, 2000 pp.2182-2187
        DOI : 10.1143/JPSJ.69.2182


    Effect of Interface Roughness on GMR in Fe/Cr Multilayers

Ajay Gupta*, Amitesh Paul**, S. M. Chaudhari and D. M. Phase

Inter-University Consortium for DAE Facilities, University Campus,
Khandwa Road, Indore-452017, India

(Received November 29, 1999)

Effect of interfacial roughness on Giant Magnetoresistance (GMR) in
Fe/Cr multilayers has been studied by simultaneously depositing
multilayers on a set of float glass substrates prepared with varying rms
surface roughness. Morphological and other microstructural features of
different multilayers are similar except for the interfacial roughness,
thus allowing one to separate out the effect of interface roughness. GMR
measurements on these multilayers show that increasing interfacial
roughness causes GMR to decrease nonlinearly. GMR tends to saturate to a
constant value for higher interfacial roughnesses because of the fact
that different multilayers differ mainly in the correlated part of
interfacial roughness.

KEYWORDS: magnetic films and multilayers, giant magnetoresistance,
interface structure and roughness


*E-mail: agupta@iucindore.ernet.in
**E-mail: prasanna@iucindore.ernet.in

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