Chapter 2 NMR of thin magnetic films and superlattices

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This chapter discusses the nuclear magnetic resonance (NMR) of thin magnetic films and superlattices. The study of the properties of thin magnetic films and multilayers is one of the most active areas of research in magnetism. The potential technical importance of the giant magnetoresistance effect (GMR) discovered in antiferromagnetically coupled Fe/Cr systems produced by sputtering, has intensified the theoretical and experimental study of structures with reduced dimensionality. The ordered electronic magnetism of a ferromagnet induces a static effective (hyperfine) magnetic field (HFF) at a nucleus even in the absence of an external field. The chapter explores how NMR using the HFF is able to provide detailed information on the structural and magnetic properties of thin films and multilayers. As the great majority of the NMR work on thin films has used the 59Co nucleus. The change in the NMR frequency of cobalt with pressure is measured and therefore, the strain in a layer can be evaluated from the NMR spectrum. A second NMR method for studying interracial mixing in Co/X multilayers is to look for the X resonance because of the HFF induced by the cobalt magnetization.

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