Abstract
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.
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