1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
2. Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
3. School of Engineering and Materials Science, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom
4. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Tianshui Road No. 222, Lanzhou 730000, People’s Republic of China