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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 5 Issue 1 (1998) pp 23-28
Well-defined Co clusters embedded in an Ag matrix: A model system for the giant magnetoresistance in granular films
S. Rubin, M. Holdenried, H. Micklitz (a)
II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
Received: 21 April 1998 / Received in final form: 17 May 1998 / Accepted: 18 May 1998
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 $\bar{L}$ for a fixed Co cluster volume fraction vcl as well as a function of vcl for a fixed $\bar{L}$. Mean Co cluster size has been varied between $\bar{L}=3.3$ 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 $B \leq$ 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.
PACS. 72.15.Gd Galvanomagnetic and other magnetotransport effects
(a) email: micklitz@colorix.ph2.uni-koeln.de
Article in PDF-Format (337 KB)
Online publication: September 11, 1998
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