Magnetic properties of cluster-beam-synthesized cobalt: Noble-metal films

Authors

J.M. Meldrim, University of Nebraska - Lincoln
Y. Qiang, University of Nebraska - LincolnFollow
Yi Liu, University of Nebraska-LincolnFollow
H. Haberland, Freiburger Materialforschungszentrum, Stefan-Meier-Stasse 21, 79104 Freiburg, Germany
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

5-1-2000

Comments

Published by American Institute of Physics. J. Applied Physics 87, 7013 (2000). ©2000 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

A cluster-beam deposition technique has been used to produce magnetic clusters embedded in a nonmagnetic matrix. We report here on films with cobalt clusters of average diameter of 5.5 nm embedded both in Cu and Ag. Volumetric concentrations of Co ranged from 10% to 50%. Magnetization and low temperature hysteresis loops, both field cooled (FC) and zero-field cooled (ZFC), have been measured between 4.2 and 300 K. The FC and ZFC magnetization bifurcate at or above room temperature with the clusters having a nonzero remanence at room temperature. Low temperature hysteresis loops exhibit a two-phase nature with one phase displaying exchange bias upon field cooling, suggesting the presence of an oxide phase. Conditions under which the oxide is present have been studied.