Interplay between oscillatory exchange coupling and coercivities in giant magnetoresistive [Ni/sub 80/Fe/sub 20/Cu/Co/Cu] multilayers

• Autor(a) principal: Valet, Tierry
• Data de Publicação: 1992
• Outros Autores: Jacquet, J.C., Galtier, P., Coutellier, J.M., Pereira, Luis Gustavo, Morel, Robert, Lottis, Daniel Kurt, Fert, Albert R.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/141863
• topic: Física

We have observed giant magnetoresistance in [Ni80Fe20/Cu/Co/Cu] multilayers with well-defined oscillations in magnitude as a function of the Cu layer thickness both at 300 and 4.2 K. The phase and period are found to be very similar to those previously measured in Co/Cu and, more recently, Ni81Fe19/Cu multilayers. However, the existence of a strong contrast in coercive fields between Ni80Fe20, and Co leads to a significant magnetoresistance for Cu layer thicknesses where coupling is zero or even moderately ferromagnetic. At room temperature, resistance changes as large as 7% are observed within a few tens of oersted of zero field.