Tunneling magnetoresistance in granular films made of well-defined Co clusters embedded in an inert-gas matrix
II. Physikalisches Institut, Universität zu Köln,
Zülpicher Strasse 77, 50937 Köln, Germany
Published online: 15 January 2000
We present a new tunneling magnetoresistance (TMR) system. Granular films consisting of well-defined ferromagnetic Co clusters embedded in insulating inert-gas matrices Kr and Xe have been prepared by the co-deposition of in-beam prefabricated Co clusters and inert-gas atoms. Experiments show that the resistance of these films clearly follows an -law and reveal a tunneling magnetoresistance (TMR) of about 7% at 10 K. The TMR is found to be only weakly temperature dependent and independent of the tunneling barrier.
PACS: 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 73.40.Gk – Tunneling / 73.40.Rw – Metal-insulator-metal structures / 61.46.+w – Clusters, nanoparticles, and nanocrystalline materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000