摘要The training effect and the hysteresis behaviour of the angular dependence of exchange bias are extensively investigated upon the variation of the IrMn layer thickness tIrMn in a series of Co/IrMn bilayers. When tIrMn is very small, both of them are negligible. Then they increase very sharply with increasing tIrMn and then reach maxima at almost the same value of tIrMn. Finally they both decrease when tIrMn is further increased. The similar variation trends suggest that these phenomena arise from irreversible change of antiferromagnet spin orientations, according to the thermal activation model.
Abstract：The training effect and the hysteresis behaviour of the angular dependence of exchange bias are extensively investigated upon the variation of the IrMn layer thickness tIrMn in a series of Co/IrMn bilayers. When tIrMn is very small, both of them are negligible. Then they increase very sharply with increasing tIrMn and then reach maxima at almost the same value of tIrMn. Finally they both decrease when tIrMn is further increased. The similar variation trends suggest that these phenomena arise from irreversible change of antiferromagnet spin orientations, according to the thermal activation model.
ZHANG Jing;DU Jun;BAI Xiao-Jun;YOU Biao;ZHANG Wei; HU An. Training Effect and Hysteretic Behaviour of Angular Dependence of Exchange Bias in Co/IrMn Bilayers[J]. 中国物理快报, 2009, 26(4): 47501-047501.
ZHANG Jing, DU Jun, BAI Xiao-Jun, YOU Biao, ZHANG Wei, HU An. Training Effect and Hysteretic Behaviour of Angular Dependence of Exchange Bias in Co/IrMn Bilayers. Chin. Phys. Lett., 2009, 26(4): 47501-047501.
[3] Beckmann B, Nowak U and Usadel K D 2003 Phys. Rev.Lett. 91 187201 [4] Yang F Y and Chien C L 2000 Phys. Rev. Lett. 85 2597 [5] Koon N C 1997 Phys. Rev. Lett. 78 4865 [6] Malozemoff A P 1987 Phys. Rev. B 35 3679 [7] Meiklejohn W H 1962 J. Appl. Phys. 33 1328 [8] Mauri D et al 1987 J. Appl. Phys. 62 3047 [9] Hoffmann A 2004 Phys. Rev. Lett. 93 097203 [10] Nogu\'{es J and Schuler I K 1999 J. Magn. Magn.Mater. 192 203 [11] Fulcomer E and Charap S H 1972 J. Appl. Phys. 43 4190 [12] Chantrell R W et al 2000 Phys. Rev. B 63024410 [13] Choo D et al 2007 J. App. Phys. 101 09E521 [14] Vallejo-Fernandez G et al 2008 J. Phys. D: Appl.Phys. 41 112001 [15] Gao T R et al 2007 Phys. Rev. Lett. 99 057201 [16] Zhang K, Zhao T and Fujiwara H 2002 J. Appl. Phys. 91 6902 [17] Xi H et al 2001 Phys. Rev. B 64 184416 [18] Zhang K, Zhao T and Fujiwara H 2001 J. Appl. Phys. 89 6910 [19] Lai C H et al 1996 J. Appl. Phys. 79 6389 [20] Chen Y T et al 2008 J. Alloys Compounds 44859 [21] Malinowski G et al 2005 J. Appl. Phys. 98113903 [22] Chan M K et al 2008 Phys. Rev. B 77 014420 [23] Brems S et al 2005 Phys. Rev. Lett. 95 157202 Brems S et al 2007 Phys. Rev. Lett. 99 067201 [24] Qiu X P et al 2008 Phys. Rev. Lett. 101147207 [25] N\'{eel L 1949 Ann. Geophys. 5 99
2009, Vol. 26 
