Coercivities Above 10 kOe in CoPd Superlattices

Author(s)

William F. Egelhoff Jr., Cedric J. Powell, L Gan, P J. Chen, H Ettedgui, D Tirosh, Robert D. McMichael, Mark D. Stiles, J Mallett, Alexander J. Shapiro, John E. Bonevich, J H. Judy, Erik B. Svedberg, A. E. Berkowitz

Abstract

We have achieved excellent grain isolation in CoPd superlattices by using 10 nm Au as both an underlayer and an overlayer and diffusing Au into the grain boundaries by annealing for {approximately equal to} 30 min. at 300 degrees C. The grain isolation allows the large perpendicular anisotropy of the system to produce magnetic properties well suited for perpendicular media. While pure Au layers give excellent results, the very best samples have a thin W seed layer deposited on the Au underlayer. Those samples exhibit a slope in the hysteresis loop close to 1.0, a nucleation field greater than 9 kOe, and a coercivity greater than 14 kOe. These are the largest coercivity and nucleation fields ever reported for the CoPd system.

Citation

Journal of Applied Physics

Pub Type

Journals

Keywords

coercivity, media, perpendicular, polladium, superlattice

Citation

Egelhoff, W. , Powell, C. , Gan, L. , Chen, P. , Ettedgui, H. , Tirosh, D. , McMichael, R. , Stiles, M. , Mallett, J. , Shapiro, A. , Bonevich, J. , Judy, J. , Svedberg, E. and Berkowitz, A. (1970), Coercivities Above 10 kOe in CoPd Superlattices, Journal of Applied Physics (Accessed October 17, 2025)