[1] Liu X G, Geng D Y and Zhang Z D 2008 Appl. Phys.
Lett. 92 243110

[2] Cao M S, Zhou W, Qu G M and Rong J L 2008 Chin. Phys.
Lett. 25 2954

[3] Huang Y Q, Hou Z L, Song W L, Yuan J and Cao M S 2009
Chin. Phys. Lett. 5 057701

[4] Ohlan A, Singh K, Chandra A and Dhawan S K 2008 Appl.
Phys. Lett. 93 053114

[5] Shi X L, Cao M S, Fang X Y, Yuan J, Kang Y Q and Song W L
2008 Appl. Phys. Lett. 93 223112

[6] Fang X Y, Shi X L, Cao M S and Yuan J 2008 J. Appl.
Phys. 104 096101

[7] Shi X L, Cao M S, Yuan J, Zhao Q L, Kang Y Q, Fang X Y and
Chen YJ 2008 Appl. Phys. Lett. 93 183118

[8] Cao M S, Shi X L, Fang X Y, Jin H B, Hou Z L, Zhou W and
Chen Y J 2007 Appl. Phys. Lett. 91 203110

[9] Wadhawan A, Garrett D and Perez J M 2003 Appl. Phys.
Lett. 83 2683

[10] Guo H Q, Xu, W, Cui M H, Yang N L and Akins D L 2003
Chem. Commun. 12 1432

[11] Zou G Z, Cao M S, Zhang L, Jin H B, Xu H and Wang Z P
2006 J. Inorg. Mater. 21 797

[12] Lisjak D, Bregar V B and Drofenik M 2007 J. Magn.
Magn. Mater. 310 2558

[13] Zhang X F, Dong X L, Huang H, Lv B, Lei J P and Choi C J
2007 J. Phys. D: Appl. Phys. 40 5383

[14] Liu H T, Cao M S, Qiu C J and Jing Z 2003 Mater.
Sci. Forum: Funct. Graded Mater. V$\!$I$\!$I 423/424 427

[15] Basheed G A, Kaul S N and Michels A 2007 Appl. Phys.
Lett. 91 033105

[16] Cao M S, Liu H T, Chen Y J, Wang B and Zhu J 2003
Sci. Chin. E 46 104

[17] Yusoff A N, Abdullah M H, Ahmad S H, Jusoh S F, Mansor A
A and Hamid S A A 2002 J. Appl. Phys. 92 876

[18] Cao M S, Wang R G, Fang X Y, Cui Z X, Chang T J and Yang
H J 2001 Powder Technol. 115 96

[19] Mu G H, Chen N, Pan X F, Yang K and Gu M Y 2007
Appl. Phys. Lett. 91 043110

[20] Kang Y Q, Cao M S, Shi X L and Hou Z L 2007 Surf.
Coat. Technol. 201 7201

[21] Wu E J and Ceder G 2001 J. Appl. Phys. 89
5630

[22] Cao M, Wang B, Li Q, Yuan J, Xu G, Qin S and Fang X 1998
Mater. Design 19 113

[23] Cao M S, Yuan J, Liu H T, Fang X Y and Zhu J 2003
Mater. Design 24 31

[24] Cao M S, Qin R R, Qiu C J and Zhu J 2003 Mater.
Design 24 391

[25] Yuan H, Xiao G and Cao M S 2006 Mater. Design
27 45

[26] Finkelberg V 1964 Sov. Phys. JETP 19 494

[27] Tsang L T and Kong J A 1981 Radio Sci. 16 303

[28] Arslan A N, Wang H, Pullianinen J and Hallikainen M 2003
J. Electromagn. Waves Appl. 17 1009

[29] Peng Z H, Cao M S, Yuan H and Xiao G 2004 Mater.
Design 25 379

[30] Stogryn A. 1983 Radio Sci. 18 1283