[2] [2] Emilie Gaudry, Delphine Cabaret, Philippe Sainctavit, et al. Journal of Physics: Condensed Matter, 2005, 17: 5467.

[3] [3] Ahmadi S, Aghaei A, Eftekhari Yekta B. Ceramics International, 2009, 35: 3485.

[4] [4] Wong C M, Rotman S R, Warde C. Appl. Phys. Lett., 1984, 44(11): 1038.

[5] [5] Dong Yongjun, Zhou Guoqing, Xu Jun, et al. Journal of Crystal Growth, 2006, 286: 476.

[7] [7] Mu Lei, He Wei, Wang LiXi, et al. Journal of Rare Earths, 2007, 25: 493.

[8] [8] Jumpei Ueda, Setsuhisa Tanabe. Journal of Applied Physics, 2009, 106: 043101.

[9] [9] Chen J, Lu T C, Xu Y, et al. Journal of Physics: Condensed Matter, 2008, 20(32): 325212.

[10] [10] Yener Kuru, Erdem Onur Savasir, Saide Zeynep Nergiz, et al. Physica Status Solidi C-Current Topics in Solid State Physics, 2008, 5(10): 3383.

[11] [11] Gilleo M A, Geller S. Journal of Applied Physics, 1958, 29(3): 380.

[12] [12] Wood D L, Ferguson J, Knox K, et al. The Journal of Chemical Physics, 1963, 39(4): 890.

[14] [14] Roger Wagner, Denis Van Loo, Fred Hossler, et al. Microscopy and Microanalysis, 2011, 17: 215.

[15] [15] Erwin Stolz, Mesut Yeniguen, Melanie Kreisel, et al. NeuroImage, 2011, 54: 1881.