Enhancement of magnetization damping coefficient of permalloy thin films with dilute Nd dopants

C. Luo,1 Z. Feng,2 Y. Fu,1,3 W. Zhang,1 P. K. J. Wong,4 Z. X. Kou,1 Y. Zhai,1,2,* H. F. Ding,2 M. Farle,3 J. Du,2 and H. R. Zhai2 1Physics Department, Southeast University, Nanjing 211189, China 2National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China 3Fakultät für Physik and Center for Nanointegration Duisburg-Essen (CeNIDE), Universität Duisburg-Essen, 47048 Duisburg, Germany 4NanoElectronics Group, MESA+ Institute of Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands (Received 31 October 2013; revised manuscript received 5 May 2014; published 20 May 2014)