[1] Kong L, Zhuang L and Chou S Y 1997 IEEE Trans. Magn. 33
3019

[2] Xiao Z L, Catherine Y Han, Welp U, Wang H H, Vlasko-Vlasov V K,
Kwok W K, Miller D J, Hiller J M, Cook R E, Willing G A and Crabtree G
W 2002 Appl. Phys. Lett. 81 2869

[3] Cowburn R P, Adeyeye A O and Bland J A C 1997 Appl. Phys.
Lett. 70 2309

[4] Guedes I, Zaluzec N J, Grimsditch M, Metlushko V, Vavassori P, Ilic
B, Neuzil P and Kumar R 2000 Phys. Rev. B 62 11719

[5] Tooprov A Y, Langford R M and Petford-Long A K 2000 Appl.
Phys. Lett. 77 3063

[6] Yu C T, Jiang H, Shen L, Flanders P J and Mankey G J 2000 J.
Appl. Phys. 87 6322

[7] Grimes C A, Trouilloud P L, Lumpp J K and Bush G C 1997 J.
App. Phys. 81 4720

[8] Liu Q F, Wang J B, Yan Z J and Xue D S 2004 J. Magn. Magn.
Mater. 278 323

[9] Weiss P and Forrer R 1929 Annalen der Physik 12 279

[10] Hall R C 1959 J. Appl. Phys. 30 816

[11] Pfeifer F and Radeloff C 1980 J. Magn. Magn. Mater. 19
190

[12] Kim Y M, Choi D, Kim K H, Kim J, Han S H and Kim H J 2003 J.
Magn. Magn. Mater. 254-255 419

[13] Torres Bruna J M, Bartolome J, Garcia Vinuesa L M, Garcia Sanchez
F, Gonzalez J M and Chubykalo-Fesenko O A 2005 J. Magn. Magn.
Mater. 290-291 149