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Spin-dependent tunneling in Co/insulating granular systems: an AC approach

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Volume
320
Identifiers
DOI: 10.1016/s0921-4526(02)00680-4
Keywords
  • Magnetic Granular Systems
  • Spin-Dependent Tunneling
  • Impedance Spectroscopy

Abstract

Abstract The spin-dependent tunneling of cobalt clusters embedded in Al 2O 3 or SiO x has been analyzed as a function of the frequency at room temperature. Two sets of samples, with one or several layers of clusters, have been produced by alternate physical deposition of the metal and the insulator. The impedance versus frequency curves were measured with and without an external magnetic field. The results suggest that when the distance between successive cluster layers is small, some correlations between the cluster positions are present.

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