... M3 M1 M1 M3 M4 VNU Journal of Science, Mathematics - Physics 25 (2009) 199-205 199 Signficantly improving magnetic properties of Sr-La-Co hexagonal ferrite Nguyen Khanh Dung1,* ... increase up-spin of positions 2a and 2b. About the role of La to improve hard magnetic properties of hexagonal ferrite, the Vietnamese researchers have published a large number of publications ... Digests of the ICF8, Kyoto, Japan (2000) 1. [2] Y. Kubota, et al. La-Co substituted Sr-Ferrite Magnets, Digests of the ICF8, Kyoto, Japan (2000) 2. [3] G. Obara, et al. Magnetic Properties of Sr-La-Co...