Well-defined Co clusters embedded in an Ag matrix: A model system for the giant magnetoresistance in granular films |
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| Authors: | S Rubin M Holdenried H Micklitz |
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| Institution: | II. Physikalisches Institut, Universit?t zu K?ln, Zülpicher Strasse 77, 50937 K?ln, Germany, DE
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| Abstract: | Well-defined granular Co/Ag films have been prepared by the co-deposition of in-beam prepared Co clusters and Ag atoms. In
this way we were able to study the giant magnetoresistance (GMR) as a function of mean Co cluster size for a fixed Co cluster volume fraction vcl as well as a function of vcl for a fixed . Mean Co cluster size has been varied between and 6.9 nm, Co cluster volume fraction between 5 and 43%. The GMR was measured in-situ at T=4.2 K in magnetic fields 1.2 T. The analysis of the GMR data obtained from these studies clearly shows that spin-dependent scattering at the Co-cluster/Ag-matrix
interface is the only relevant scattering mechanism causing the GMR in our well-defined samples.
Received: 21 April 1998 / Received in final form: 17 May 1998 /
Accepted: 18 May 1998 |
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| Keywords: | PACS 72 15 Gd Galvanomagnetic and other magnetotransport effects |
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