Abstract—A series of Cox-Au1-x granular alloys was grown using pulsed-current electrodeposition on polyimide substrates. The relationship between the giant magnetoresistance effect, saturation magnetization, and grain size was examined as the deposition current density and annealing temperatures were changed. A maximum magnetores istance (MR) ratio of 4.5 % was obtained. The magnetization and ferromagnetic grain size of the as-deposited and anneal ed alloy films were examined against the deposition current density. The saturation magnetization decreased as the composition of Au was increased for both the alloys deposited at the current densities of 1 and 5 mA/cm2. The total magnetic moment further decreased on annealing. The grai n size is found to be highly influenced by both the deposition current density and temperature. A low temperature magnetization measurement suggested that the ferromagneti c grain size decreases with increase in current densities. For the annealed samples, the ferromagnetic grain sizes were found to be dispersed in the Au matrix with different diameters. The decrease in magnetic moments with annealing is correlated with the grain size of the Co and its distribution in the gold matrix. The MR ratio increased with the increase in the deposition current density as a result of the formation of smaller grain size at higher deposition current densities.

Index Terms—Co-Au granular alloys, giant magnetoresistance effect, saturation magnetization, ferromagnetic grains.

Conrad Rizal is with the Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada (corresponding author: +1-604-822-6268; fax:+1-604-822-5949; e-mail:crizal@ece.ubc.ca).
Y. Ueda is with the Department of Electrical and Electronic Engineering, Muroran Institute of Technology, 27-1, Mizumoto-cho, Muroran-shi, Hokkaido, 050-8585, Japan. (e-mail:ueda@mmm.muroran-it.ac.jp).
His current status is a Professor Emeritus. Ramesh K. Pokharel is with the E-JU ST Center, Department of Electrical and Communication Engineering, Kyushu University, Fukuoka, 819-0395, Japan. (e-mail: pokharel@ed.kyushu-u.ac.jp).

Cite: Conrad Rizal, Yuji Ueda, and Ramesh K. Pokharel , " Magnetotransport Properties of Co-Au Granular Alloys ," International Journal of Applied Physics and Mathematics  vol. 1, no. 3, pp. 161-166, 2011.