[1] Tong L, Mehregany M and Matus L G 1992 Appl. Phys. Lett.
60 2992

[2] Morko\c c H, Strite S, Gao G B, Lin M E, Sverdlov B and Burns
M 1994 J. Appl. Phys. 76 1363

[3] Zorman C A, Fleischman A J, Dewa A S, Meheregany M, Jacob C,
Nishino S and Pirouz P 1995 J. Appl. Phys. 78 5135

[4] Hamza A V, Balooch M and Moalem M 1994 Surf. Sci.
317 L1129

[5] Balooch M and Hamza A V 1994 J. Vac. Sci. Technol. B 12 3218

[6] Chen D, Workman R and Sarid D 1995 Surf. Sci. 344 23

[7] Henke S, Stritzker B and Rauschenbach B 1995 J. Appl.
Phys. 78 2070

[8] Geier S, Zeitler M, Helming K, Philip M, Henke S, Strizker B and
Rauschenbach B 1997 Appl. Phys. A: Mater. Sci. Process 64 139

[9] Moro L, Paul A, Lorents D C, Malhotra R, Ruoff R S, Lazzeri P,
Vanzetti L, Lui A and Subramoney S 1997 J. Appl. Phys. 81 6141

[10] Sakamoto K, Harada M, Ashima H, Suzuki T, Wakita T, Kasuya A and
Suto S 1998 J. Electron Spectrosc. Relat. Phenom. 897 88

[11] Sakamoto K, Suzuki T, Harada M, Wakita T, Suto S and Kasuya A 1998
Phys. Rev. B 57 9003

[12] Sakamoto K, Kondo D, Ushimi Y, Harada M, Kimura A, Kakizaki A and
Suto S 1999 Phys. Rev. B 60 2579

[13] Volz K, Schreiber S, Zeitler M, Rauschenbach B, Stritzker B and
Ensinger W 1999 Surf. Coat. Technol. 122 101

[14] Cepek C, Schiavuta P, Sancrotti M and Pedio M 1999 Phys.
Rev. B 60 2068

[15] Volz K, Schreiber S, Gerlach J W, Reiber W, Rauschenbach B,
Stritzker B, Assmann W and Ensinger W 2000 Mater. Sci. Eng. A
289 255

[16] Cheng C P, Huang J W, Pi T W and Lee H H 2006 J. Appl.
Phys. 99 123708

[17] Yang L, Zhang X, Huang R, Zhang G Y and Xue C G 2006
Physica E 35 146

[18] Iwanowski R J, Fronc K, Paszkowicz W and Heinonen M 1999
J. Alloys Compd. 286 143

[19] Narita Y, Inubushi T, Yasui K and Akahane T 2003 Appl.
Surf. Sci. 212-213 730