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Publication Citation: Observation of antiparallel magnetic order in weakly coupled Co/Cu multilayers

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Author(s): Julie A. Borchers; Joseph A. Dura; John Unguris; D Tulchinsky; Michael H. Kelley; Charles F. Majkrzak; S. Y. Hsu; R Loloee; W Pratt; J Bass;
Title: Observation of antiparallel magnetic order in weakly coupled Co/Cu multilayers
Published: May 23, 1998
Abstract: Polarized neutron reflectivity and scanning electron microscopy with polarization analysis are combined to determine the magnetic structure of Co(6 nm)/Cu(6 nm) multilayers. These data resolve a controversy regarding the low-field state of giant-magnetoresistive (GMR) multilayers with weak coupling. As-prepared samples show a strong antiparallel correlation of in-plane ferromagnetic Co domains across the Cu. At the coercive field, the Co domains are uncorrelated. This irreversible transition explains the decrease in magnetoresistance from the as-prepared to the coercive state and indicates that the as-prepared state best represents the antiparallel configuration assumed in GMR analysis. For both states, the Co moments reside in domains with in-plane sizes of {asymp} 0.5 - 1.5 υm.
Citation: Physical Review Letters
Volume: 82
Issue: No. 13
Pages: pp. 2796 - 2799
Keywords: interlayer exchange coupling,magnetic multilayers,polarized neutron reflectivity,scanning electron microscopy,w/polarization analysis
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (417KB)