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Journal of Applied Physics -- November 15, 1994 -- Volume 76, Issue 10 pp. 6613-6615

Investigation of the magnetic structures in giant magnetoresistive multilayer films by electron microscopy

L. J. Heyderman and J. N. Chapman

Department of Physics and Astronomy, Glasgow University, Glasgow, G12 8QQ, United Kingdom

S. S. P. Parkin

IBM Research Division, Almaden Research Centre, 650 Harry Road, San Jose, California 95120-6099

The magnetic structures which occur in (Co/Ni₈₁Fe₁₉/Co)/Cu multilayer films showing giant magnetoresistance have been investigated using electron microscopy. Rather similar fine domains, with sub-µm dimensions, were found in films comprising 14 and 6 magnetic layers. Whilst the observed structure depended greatly on the magnetic history of the sample, a combination of differential phase contrast imaging and low angle diffraction allowed an estimate to be made of the extent to which neighboring magnetic layers were aligned antiparallel to each other. For both samples typically two layers were found to have parallel alignment leading to the possibility that departures from the expected antiferromagnetic behavior are more prevalent at the surfaces rather than in the bulk of the multilayer. Journal of Applied Physics is copyrighted by The American Institute of Physics.

DOI: 10.1063/1.358210
PACS: 75.70.Fr, 72.15.Gd, 61.16.Bg        Additional Information