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The magnetization reversal processes of cobalt nanowires under different constant external magnetic fields have been studied by using the finite element micromagnetism simulation approach. The results show that magnetic domains with opposite magnetizations will be formed at one end of nanowires with a diameter of 10 nm after a nucleation time. The domain wall is classified as a transverse wall，which can be driven to move with a constant velocity by a constant external applied field from one end to the other. The velocity of domain wall is linearly dependent on the magnitude of external applied magnetic field. When H is 1000 kA/m，it is found that two head-to-head domains are found at both ends of nanowires. The calculation results show that the domain wall moves a constant distance during a period in which the direction of any magnetic moment rotates a cycle，which is independent of the magnitude of applied magnetic field.
[1] ［1］Mao C Y，Zhu J G，White R M 2000 J. Appl. Phys. 87 5416
[2] ［2］Allwood D A，Xiong G，Cowburn R P 2006 Appl. Phys. Lett. 89 102504
[3] ［3］Allwood D A，Xiong G，Faulkner C C，Atkinson D，Petit D，Cowburn R P 2005 Science 309 1688
[4] ［4］Diegel M，Mattheis R，Halder E 2007 Sens. Lett. 5 118
[5] ［5］Diegel M，Mattheis R，Halder E 2004 IEEE Trans. Magn. 40 2655
[6] ［6］Allwood D A，Schrefl T，Hrkac G，Hughes I G，Adams C S 2006 Appl. Phys. Lett. 89 014102
[7] ［7］Martinez E，Lopez-Diaz L，Torres L，Tristan C，Alejos O 2007 Phys. Rev. B 75 174409
[8] ［8］Ono T，Miyajima H，Shigeto K，Mibu K，Hosoito N，Shinjo T 1999 Science 284 468
[9] ［9］Grollier J，Boulenc P，Cros V，Hamzic A，Vaurès A，Fert A，Faini G 2003 Appl. Phys. Lett. 83 509
[10] ］Hayashi M，Thomas L，Rettner C，Moriya R，Bazaliy Y B，Parkin S S P 2007 Phys. Rev. Lett. 98 037204
[11] ］Brownlie C，McVitie S，Chapman J N，Wilkinson C D W 2006 J. Appl. Phys. 100 033902
[12] ］da Silva F C S，Uhlig W C，Kos A B，Schima S，Aumentado J，Unguris J，Pappas D P 2004 Appl. Phys. Lett. 85 6022
[13] ］Chapman J N，Scheinfein M R 1999 J. Magn. Magn. Mater. 200 729
[14] ］Zhu X，Allwood D A，Xiong G，Cowburn R P，Grütter P 2005 Appl. Phys. Lett. 87 062503
[15] ］Bryan M T，Fry P W，Fischer P J，Allwood D A 2008 J. Appl. Phys. 103 07D909
[16] ］Zhang H W，Rong C B，Zhan J，Zhang S Y，Shen B G 2003 Acta Phys. Sin. 52 718 （in Chinese）［张宏伟、荣传兵、张健、张绍英、沈保根 2003 52 718］
[17] ］Hertel R，Kirschner J 2004 Physica B 343 206
[18] ］Porter D G，Donahue M J 2004 J. Appl. Phys. 95 6729
[19] ］Ndjaka J M B，Thiaville A，Miltat J 2009 J. Appl. Phys. 105 023905
[20] ］Aharoni A 1996 Introduction to Theory of Ferromagnetism （New York：Oxford University Press） p31
[21] ］Fredkin D R，Koehler T R 1990 IEEE Trans. Magn. 26 415
[22] ］OOMMF 软件：http：//math.nist.gov/oommf/
[23] ］Kuhn K 2006 Proc. Appl. Math. Mech. 6 493
[24] ］Hinzke D，Nowak U 2000 J. Magn. Magn. Mater. 221 365
[25] ］Malozemoff A P，Slonczewski J C 1979 Magnetic Domain Walls in Bubble Materials （New York：Academic Press） p15
[26] ］Hubert A，Schafer R 1998 Magnetic Domains （Berlin：Springer-Verlag）pg237
[27] ］Atkinson D，Allwood D A，Xiong G，Cooke M D，Faulkner C C，Cowburn R P 2003 Nat. Mater. 2 8
[28] ］Beach G S D，Nistor C，Knutson C，Tsoi M，Erskine J L 2005 Nat. Mater. 4 741
[29] ］Hayashi M，Thomas L，Rettner C，Moriya R，Parkin S S P 2007 Nat. Phys. 3 21
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[1] ［1］Mao C Y，Zhu J G，White R M 2000 J. Appl. Phys. 87 5416
[2] ［2］Allwood D A，Xiong G，Cowburn R P 2006 Appl. Phys. Lett. 89 102504
[3] ［3］Allwood D A，Xiong G，Faulkner C C，Atkinson D，Petit D，Cowburn R P 2005 Science 309 1688
[4] ［4］Diegel M，Mattheis R，Halder E 2007 Sens. Lett. 5 118
[5] ［5］Diegel M，Mattheis R，Halder E 2004 IEEE Trans. Magn. 40 2655
[6] ［6］Allwood D A，Schrefl T，Hrkac G，Hughes I G，Adams C S 2006 Appl. Phys. Lett. 89 014102
[7] ［7］Martinez E，Lopez-Diaz L，Torres L，Tristan C，Alejos O 2007 Phys. Rev. B 75 174409
[8] ［8］Ono T，Miyajima H，Shigeto K，Mibu K，Hosoito N，Shinjo T 1999 Science 284 468
[9] ［9］Grollier J，Boulenc P，Cros V，Hamzic A，Vaurès A，Fert A，Faini G 2003 Appl. Phys. Lett. 83 509
[10] ］Hayashi M，Thomas L，Rettner C，Moriya R，Bazaliy Y B，Parkin S S P 2007 Phys. Rev. Lett. 98 037204
[11] ］Brownlie C，McVitie S，Chapman J N，Wilkinson C D W 2006 J. Appl. Phys. 100 033902
[12] ］da Silva F C S，Uhlig W C，Kos A B，Schima S，Aumentado J，Unguris J，Pappas D P 2004 Appl. Phys. Lett. 85 6022
[13] ］Chapman J N，Scheinfein M R 1999 J. Magn. Magn. Mater. 200 729
[14] ］Zhu X，Allwood D A，Xiong G，Cowburn R P，Grütter P 2005 Appl. Phys. Lett. 87 062503
[15] ］Bryan M T，Fry P W，Fischer P J，Allwood D A 2008 J. Appl. Phys. 103 07D909
[16] ］Zhang H W，Rong C B，Zhan J，Zhang S Y，Shen B G 2003 Acta Phys. Sin. 52 718 （in Chinese）［张宏伟、荣传兵、张健、张绍英、沈保根 2003 52 718］
[17] ］Hertel R，Kirschner J 2004 Physica B 343 206
[18] ］Porter D G，Donahue M J 2004 J. Appl. Phys. 95 6729
[19] ］Ndjaka J M B，Thiaville A，Miltat J 2009 J. Appl. Phys. 105 023905
[20] ］Aharoni A 1996 Introduction to Theory of Ferromagnetism （New York：Oxford University Press） p31
[21] ］Fredkin D R，Koehler T R 1990 IEEE Trans. Magn. 26 415
[22] ］OOMMF 软件：http：//math.nist.gov/oommf/
[23] ］Kuhn K 2006 Proc. Appl. Math. Mech. 6 493
[24] ］Hinzke D，Nowak U 2000 J. Magn. Magn. Mater. 221 365
[25] ］Malozemoff A P，Slonczewski J C 1979 Magnetic Domain Walls in Bubble Materials （New York：Academic Press） p15
[26] ］Hubert A，Schafer R 1998 Magnetic Domains （Berlin：Springer-Verlag）pg237
[27] ］Atkinson D，Allwood D A，Xiong G，Cooke M D，Faulkner C C，Cowburn R P 2003 Nat. Mater. 2 8
[28] ］Beach G S D，Nistor C，Knutson C，Tsoi M，Erskine J L 2005 Nat. Mater. 4 741
[29] ］Hayashi M，Thomas L，Rettner C，Moriya R，Parkin S S P 2007 Nat. Phys. 3 21
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