Ma Jun, Yang Wan-Min, Wang Miao, Chen Sen-Lin, Feng Zhong-Ling. The effect of additional permanent magnet magnetizing methods on magnetic field distribution and the levitation force of single domain GdBCO bulk superconductorJ. Acta Physica Sinica, 2013, 62(22): 227401. DOI: 10.7498/aps.62.227401