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In order to investigate the influence of anneal treatment on the Co-based melt extraction wires, the soft magnetic properties and giant magnet-impedance （GMI） effect of the annealed Co75Fe40Si8B12Nb1 wire are investigated. Samples are prepared using melt extraction technology in vacuum and annealed at 450℃ without magnetic field or with miagntic field either longitudinal or transverse to the axis of wire of strength from 500 Oe to 4000 Oe，respectively. The magnetic softness and GMI response are measured using HP4192 Impedance Analyzer and Lakeshore7407 VSM. Test results show that the circular anisotropy and GMI response are reduced after longitudinal field anneal treatment. GMI profiles are single-peaked and the maximum impedance ratio ΔZ/Z is 131% and field sensitivity is 7%/Oe. The circular permeability and GMI response are improved after transverse field anneal treatments because of the increased circular anisotropy. At higher frequencies，the GMI profiles change from single-peaked to two-peaked after being annealed in strong transverse field. The circular permeability is increased and GMI effect gets stronger with the increase of current frequency and anneal field. The largest impedance ratio of 190% with a field sensitivity of 26%/Oe is obtained for the Co-based transverse field annealed wires at 10 MHz. The correlations between the circular permeability，the GMI effect and the current frequency are discussed in the light of a skin effect model.
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Keywords:
- amorphous wires /
- giant magnetoimpedance effect /
- anneal treatment
[1] ［1］Mohri K，Kohzawa T 1992 IEEE Trans Magn. 28 3150
[2] ［2］Phan M H，Peng H X 2008 Prog Mate Sci. 53 323
[3] ［3］Wang W J，Xiao S Q，Jiang S，Yuan H M，Wu Z Y，Ji G，Yan S S，Liu Y H，Mei L M 2005 Thin Solid Films. 484 299
[4] ［4］Phan M H，Peng H X， Wisnom M R，Yu S C 2005 J. Appl. Phys. 98 014316
[5] ［5］Li Y F，Chen D X，Guo H Q，Vazquez M，Hernando A 2000 Acta Phys. Sin. 49 1591 （in Chinese）［李印峰、陈笃行、郭慧群、Vazquez M，Hernando A 2000 物理学报 49 1591］
[6] ［6］Li Y F，Yin S Z，Vazquez M 2005 Acta Phys. Sin. 54 3391 （in Chinese）［李印峰、尹世忠、Vazquez M 2005 物理学报 54 3391］
[7] ［7］Yelon A，Menard D，Britel M，Ciureanu P 1996 Appl. Phys. Lett. 69 3084
[8] ［8］Kamruzzaman M，Rahman I Z，Rahman M A 2001 J. Mater. Proc. Tech. 119 312
[9] ［9］Vazquez M 2001 J. Magn. Magn. Mater. 226-230 693
[10] ］Zhukov A，Zhukova V，Blanco J M，Gonzalez J 2005 J. Magn. Magn. Mater. 294 182
[11] ］Vinai F，Coisson M，Tiberto P 2006 J. Magn. Magn. Mater. 300 e82
[12] ］Wang W J，Yuan H M，Xiao S Q，Jiang S，Yan S S 2006 Acta Phys. Sin. 55 6108 （in Chinese）［王文静、袁慧敏、姜山、萧淑琴、颜世申 2006 物理学报 55 6108］
[13] ］Vazquez M，Chen D X 1995 IEEE Trans Magn. 31 1229［14］Chen D X，Pascual L，Castano F J，Vazquez M，Hernando A 2001 IEEE Trans on Magn. 37 994
[14] ］Chizhik A，Gonzalez J，Zhukov A，Blanco J M 2007 Sens. Acta. A 126 235
[15] ］Li Y F，Yin S Z，Zhao S Y，Feng S Q，Vazquez M 2000 J. Hebei Normal University （Natural Science） 24 455 （in Chinese）［李印峰、尹世忠、赵双义、封素芹、Vazquez M 2000 河北师范大学学报（自然科学版） 24 455］
[16] ］Zhang J C，Liu L P，Zhao Z J，Yang X L，Wang Q 2007 J. East Normal University （Natural Science） 1 107 （in Chinese）［张军车、刘龙平、赵振杰、杨燮龙、王清江 2007 华东师范大学学报（自然科学版） 1 107］
[17] ］Chen D X，Munoz J，Hernando A，Vazquez M 1998 Phys. Rev. B 57 10699
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[1] ［1］Mohri K，Kohzawa T 1992 IEEE Trans Magn. 28 3150
[2] ［2］Phan M H，Peng H X 2008 Prog Mate Sci. 53 323
[3] ［3］Wang W J，Xiao S Q，Jiang S，Yuan H M，Wu Z Y，Ji G，Yan S S，Liu Y H，Mei L M 2005 Thin Solid Films. 484 299
[4] ［4］Phan M H，Peng H X， Wisnom M R，Yu S C 2005 J. Appl. Phys. 98 014316
[5] ［5］Li Y F，Chen D X，Guo H Q，Vazquez M，Hernando A 2000 Acta Phys. Sin. 49 1591 （in Chinese）［李印峰、陈笃行、郭慧群、Vazquez M，Hernando A 2000 物理学报 49 1591］
[6] ［6］Li Y F，Yin S Z，Vazquez M 2005 Acta Phys. Sin. 54 3391 （in Chinese）［李印峰、尹世忠、Vazquez M 2005 物理学报 54 3391］
[7] ［7］Yelon A，Menard D，Britel M，Ciureanu P 1996 Appl. Phys. Lett. 69 3084
[8] ［8］Kamruzzaman M，Rahman I Z，Rahman M A 2001 J. Mater. Proc. Tech. 119 312
[9] ［9］Vazquez M 2001 J. Magn. Magn. Mater. 226-230 693
[10] ］Zhukov A，Zhukova V，Blanco J M，Gonzalez J 2005 J. Magn. Magn. Mater. 294 182
[11] ］Vinai F，Coisson M，Tiberto P 2006 J. Magn. Magn. Mater. 300 e82
[12] ］Wang W J，Yuan H M，Xiao S Q，Jiang S，Yan S S 2006 Acta Phys. Sin. 55 6108 （in Chinese）［王文静、袁慧敏、姜山、萧淑琴、颜世申 2006 物理学报 55 6108］
[13] ］Vazquez M，Chen D X 1995 IEEE Trans Magn. 31 1229［14］Chen D X，Pascual L，Castano F J，Vazquez M，Hernando A 2001 IEEE Trans on Magn. 37 994
[14] ］Chizhik A，Gonzalez J，Zhukov A，Blanco J M 2007 Sens. Acta. A 126 235
[15] ］Li Y F，Yin S Z，Zhao S Y，Feng S Q，Vazquez M 2000 J. Hebei Normal University （Natural Science） 24 455 （in Chinese）［李印峰、尹世忠、赵双义、封素芹、Vazquez M 2000 河北师范大学学报（自然科学版） 24 455］
[16] ］Zhang J C，Liu L P，Zhao Z J，Yang X L，Wang Q 2007 J. East Normal University （Natural Science） 1 107 （in Chinese）［张军车、刘龙平、赵振杰、杨燮龙、王清江 2007 华东师范大学学报（自然科学版） 1 107］
[17] ］Chen D X，Munoz J，Hernando A，Vazquez M 1998 Phys. Rev. B 57 10699
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