Large energy product enhancement in perpendicularly coupled MnBi/CoFe magnetic bilayers

T. R. Gao,1 L. Fang,1 S. Fackler,1 S. Maruyama,1 X. H. Zhang,1 L. L. Wang,2 T. Rana,3,4 P. Manchanda,3 A. Kashyap,4,5 K. Janicka,2 A. L. Wysocki,2 A. T. N’Diaye,6 E. Arenholz,6 J. A. Borchers,7 B. J. Kirby,7 B. B. Maranville,7 K. W. Sun,2 M. J. Kramer,2 V. P. Antropov,2 D. D. Johnson,2,8 R. Skomski,3 J. Cui,9 and I. Takeuchi1,* 1Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA 2Division of Materials Science and Engineering, Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, USA 3Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA 4Department of Physics, The LNM Institute of Information Technology, Jaipur, Rajasthan, India 5School of Basic Science, Indian Institute of Technology, Mandi, Himachal Pradesh, India 6Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 7NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA 8Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA 9Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, USA (Received 29 December 2015; revised manuscript received 4 May 2016; published 29 August 2016)