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The magnetic domain evolution behaviors of ferromagnetic (FM) monolayer and ferromagnetic (FM)/antiferromagnetic (AFM) bilayer are compared and analyzed. The results indicate that the equivalent width, mass and velocity of magnetic domain wall are changed, then the coercivity is enhanced and the exchange bias is present due to the exchange coupling between anti- ferromagnetic and ferromagnetic layer. The results also show that the equivalent width, mass and velocity of magnetic domain wall for FM /AFM bilayers system could be varied with the change of the net magnetization of antiferromagnetic layer, the magnetic anisotropy constants of FM and AFM layer, the exchange coupling constant of antiferromagnetic layer, interface exchange coupling constant and the temperature, and the relevant influences on the coercivity and exchange bias are discussed. So, the physical mechanisms of the emergence of exchange bias and enhancement of coercivity are discovered by the formation and evolution of the domain wall.
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Keywords:
- FM/AFM bilayers /
- magnetic domain-wall motion /
- coercivity /
- exchange bias field
[1] Noges J, Schuller I K 1999 Magn. Magn. Mater. 192 203
[2] Meiklejohn W H, Bean C P 1956 Phys. Rev. 102 1413
[3] Meiklejohn W H, Bean C P 1957 Phys. Rev. 105 904
[4] Stamps R L 2000 J. Phys. D: Appl. Phys. 33 247
[5] Nowak U, Usadel K D, Keller J, Miltenyi P, Beschoten B, Guntherodt G 2002 Phys. Rev. B 66 014430
[6] Wu X W, Chien C L 1998 Phys. Rev. Lett. 81 2795
[7] Eftaxias E, Trohidou K N 2005 Phys. Rev. B 71 134406
[8] Miltenyi P, Gierlings M, Keller J, Beschoten B, Guntherodt G, Norwak U, Usadel K D 2000 Phys. Rev. Lett. 84 4224
[9] Bae S, Judy J H, Egelhoff W F 2000 J. Appl. Phys. 87 6650
[10] Jungblut R, Coehoorn R, Johnson M T, Sauer C, van der Zaag P J, Ball A R 1995 Magn. Magn. Mater. 148 300
[11] Nakatani R, Hoshino K, Noguchi S, Sugita Y 1994 Appl. Phys. 33 133
[12] Bae S, Judy J H, Egelhoff W F, Chen P J 2000 J. Appl. Phys. 87 6650
[13] Tian H Y, Xu X Y, Hu J G 2009 Acta Phys. Sin. 58 2757 (in Chinese) [田宏玉, 许小勇, 胡经国 2009 58 2757]
[14] Tsang C, Fontana R E, Lin F 1994 IEEE Trans. Magn. 30 3801
[15] Dieny B, Speriosu V, Parkin P 1991 Phys. Rev. B 43 1297
[16] Heim D E, Fontana Jr R E, Tsang C 1994 IEEE Trans. Magn. 30 316
[17] Daughton J M, Chen Y J 1993 IEEE Trans. Magn. 29 2705
[18] Dieny B J 1994 Magn. Magn. Mater. 136 335
[19] Stamps R L, Usadel K D 2006 Eur. Phys. Lett. 74 512
[20] Xu Y, Hu J G, Stamps R L 2008 Commuun. Theor. Phys. 50 253
[21] Scholten G, Usadel K D, Nowak U 2005 Phys. Rev. B 71 064413
[22] Zhong W D 1998 Ferromagnetics (2) (Beijing: Science Press) p95 (in Chinese) [钟文定 1998 铁磁学(中册) (北京: 科学出版社) p95]
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[1] Noges J, Schuller I K 1999 Magn. Magn. Mater. 192 203
[2] Meiklejohn W H, Bean C P 1956 Phys. Rev. 102 1413
[3] Meiklejohn W H, Bean C P 1957 Phys. Rev. 105 904
[4] Stamps R L 2000 J. Phys. D: Appl. Phys. 33 247
[5] Nowak U, Usadel K D, Keller J, Miltenyi P, Beschoten B, Guntherodt G 2002 Phys. Rev. B 66 014430
[6] Wu X W, Chien C L 1998 Phys. Rev. Lett. 81 2795
[7] Eftaxias E, Trohidou K N 2005 Phys. Rev. B 71 134406
[8] Miltenyi P, Gierlings M, Keller J, Beschoten B, Guntherodt G, Norwak U, Usadel K D 2000 Phys. Rev. Lett. 84 4224
[9] Bae S, Judy J H, Egelhoff W F 2000 J. Appl. Phys. 87 6650
[10] Jungblut R, Coehoorn R, Johnson M T, Sauer C, van der Zaag P J, Ball A R 1995 Magn. Magn. Mater. 148 300
[11] Nakatani R, Hoshino K, Noguchi S, Sugita Y 1994 Appl. Phys. 33 133
[12] Bae S, Judy J H, Egelhoff W F, Chen P J 2000 J. Appl. Phys. 87 6650
[13] Tian H Y, Xu X Y, Hu J G 2009 Acta Phys. Sin. 58 2757 (in Chinese) [田宏玉, 许小勇, 胡经国 2009 58 2757]
[14] Tsang C, Fontana R E, Lin F 1994 IEEE Trans. Magn. 30 3801
[15] Dieny B, Speriosu V, Parkin P 1991 Phys. Rev. B 43 1297
[16] Heim D E, Fontana Jr R E, Tsang C 1994 IEEE Trans. Magn. 30 316
[17] Daughton J M, Chen Y J 1993 IEEE Trans. Magn. 29 2705
[18] Dieny B J 1994 Magn. Magn. Mater. 136 335
[19] Stamps R L, Usadel K D 2006 Eur. Phys. Lett. 74 512
[20] Xu Y, Hu J G, Stamps R L 2008 Commuun. Theor. Phys. 50 253
[21] Scholten G, Usadel K D, Nowak U 2005 Phys. Rev. B 71 064413
[22] Zhong W D 1998 Ferromagnetics (2) (Beijing: Science Press) p95 (in Chinese) [钟文定 1998 铁磁学(中册) (北京: 科学出版社) p95]
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