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Direct experimental study of the microscopic remagnetization mechanism in Co/Cu magnetic superlattices

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Journal of Magnetism and Magnetic Materials

Volumes 198-199
1 June 1999
Pages 477-479

PII: S0304-8853(98)01151-2
Copyright © 1999 Elsevier Science B.V. All rights reserved.

V. I. Nikitenko ^,^,^a, V. S. Gornakov^a, L. M. Dedukh^a, A. F. Khapikov^a, T. P. Moffat^b, A. J. Shapiro^b, R. D. Shull^b, M. Shima^c and L. Salamanca-Riba^c

^a Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow District 142432, Russia
^b National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
^c Department of Materials and Nuclear Engineering, University of Maryland, College Park, MD 20742, USA

Available online 7 January 2000.

Using the magneto-optical indicator film technique, the correlation between the magnitude of the giant magnetoresistance (GMR) and the micromechanism of the magnetization reversal of electrodeposited Co/Cu superlattices are investigated for a range of Cu spacer thicknesses. The multilayers showing vanishing GMR exhibit a cooperative spin behaviour, which is similar to that exhibited by thin ferromagnetic films with in-plane fourfold anisotropy. In contrast, superlattices with a substantial GMR demonstrate partially coupled noncollinear spin configurations, which are probably responsible for the observed giant magnetoresistance phenomenon.

Author Keywords: Metallic multilayers; Giant magnetoresistance; Magnetization reversal; Domian structure

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(3K)
Fig. 1. Dependence of the magnetoresistance ratio on the thickness of Cu spacer for Co/Cu multilayers electrodeposited on Si(1 0 0) substrates.

R/R=(R_max-R_sat)/R_sat. Inset: Magnetoresistance curves for the Co/Cu multilayer with d_Cu=30 Å (a) and d_Cu=8 Å (b).

(13K)
Fig. 2. MOIF images of the [1 1 0] easy-axis magnetization reversal in Co/Cu multilayer with d_Cu=8 Å.

_oH=17.1 mT (a), - 1.68 (b), - 1.96 (c), and - 2.37 (d). White arrows indicate the direction of the applied filed, black arrows show the magnetization in domains.

(26K)
Fig. 3. MOIF images of the [1 1 0] easy-axis magnetization reversal in Co/Cu multilayer with d_Cu=30 Å. Arrows with black and white heads indicate magnetization direction in different Co layers. White arrows indicate the direction of an applied field.

₀H=-11.2 mT (a), - 16.0 (b), 11.3 (c), 12.4 (d), 13.9 (e), 15.7 (f). All images are of the same area in the same sample orientation.

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Corresponding author. Tel.: +7-96-576-411; fax: +7-95-524-5063; email: nikiten@issp.ac.ru

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Journal of Magnetism and Magnetic Materials
Volumes 198-199
1 June 1999
Pages 477-479

150 of 238

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