Author Affiliations

Y. Xiao,¹ H. Qian,¹ and Z. Liu^1,2,3,*

¹Department of Electrical Engineering, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA, USA 92093

²Material Science and Engineering, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA, USA 92093

³Center for Magnetic Recording Research, University of California, San Diego, 9500 Gilman Dr, La Jolla, CA, USA 92093

^*Corresponding author: zhaowei@ucsd.edu