Spin-dependent transport in films composed of Co clusters and C $_{mathsf{60}}$ fullerenes期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Spin-dependent transport in films composed of Co clusters and C $_{mathsf{60}}$ fullerenes

Authors:	H.?Zare-Kolsaraki author-information" > author-information__contact u-icon-before" > mailto:kolsarak@ph.uni-koeln.de" title=" kolsarak@ph.uni-koeln.de" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,H.?Micklitz

Affiliation:	(1) II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany

Abstract:	Granular films of Co-cluster/C₆₀ mixtures have been prepared by the co-deposition of well defined Co clusters (mean diameter 4.5 nm) and C₆₀ fullerenes onto a cold (35 K) substrate. Films having a Co cluster volume fraction $0.23 leq v_{rm Co} leq 0.32$ show a resistivity $rho propto exp(T_{0}/T)^{1/2}$ , typical for tunneling with a Coulomb barrier. The tunneling magnetoresistance (TMR) has a value of TMR (% for $v_{rm Co} = 0.23$ and is decreasing by almost one order of magnitude going to $v_{rm Co} = 0.32$ . We explain this unusual decrease of the TMR with increasing $v_{rm Co}$ as caused by electron-doping of the C₆₀ fullerenes due to the known charge transfer process occurring between transition metal surface and C₆₀. Increasing electron doping may lead to an increasing probability for spin-flip processes within the tunneling barrier, resulting in a decrease of the TMR.Received: 17 March 2004, Published online: 3 August 2004PACS: 75.47.-m Magnetotransport phenomena; materials for magnetotransport - 73.40.Gk Tunneling - 73.40.Rw Metal-insulator-metal structures

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