本文讨论了长度对玻璃包覆钴基非晶丝巨磁阻抗效应的影响.通过测量不同频率下(0.1～1MHz)以及不同长度样品的巨磁阻抗效应,结果表明,长度对玻璃包覆钴基非晶丝巨磁阻抗效应有显著影响.通过计算样品的环向磁导率,发现样品的磁畴结构和饱和磁化后的退磁场影响着环向磁导率变化大小.没有加入恒定磁场时,特殊的磁畴结构决定了不同长度样品的环向磁导率近似相等.饱和磁化后,较长的样品的环向磁导率较小,其环向磁导率的变化较大,从而导致相应的巨磁阻抗效应增强.
The length effect on giant magneto-impedance in glass-covered Co-rich amorphous wires were studied in this paper. The measurements of the magneto-impedance of the samples with different length and the driver current frequency (from 100 KHz to 1 MHz) were carried out. It was found that the variation of GMI of the longer sample was more evident. The circular permeability was further calculated. The study of the circular permeability indicates that GMI effect is influenced by the domain and demagneti-zation energy after longitudinal saturated magnetization. Without dc field, the circular permeability of sam-pies is approximate equality and this phenomenon was explained by the core-shell model. After longitudi-nal saturated magnetization, the circular permeability of the longer sample is smaller for the demagnetization energy effect. Thus, the variation of the circular permeability becomes more severe for the longer sample. The conclusions will deepen the understanding of GMI effect.
参考文献
| [1] | Mohri K.;Kohsawa T. .Magneto-inductive effect (MI effect) in amorphous wires[J].IEEE Transactions on Magnetics,1992(5):3150-3152. |
| [2] | Kawashima K.;Ogasawara I. .Asymmetrical magneto-impedance effect in torsion-annealed Co-rich amorphous wire for MI micro magnetic sensor[J].IEEE Transactions on Magnetics,1999(5):3610-3612. |
| [3] | Noda M.;Panina L.V. .Pulse response bistable magneto-impedance effect in amorphous wires[J].IEEE Transactions on Magnetics,1995(6):3167-3169. |
| [4] | Bushida K.;Mohri K. .Sensitive magneto-inductive effect in amorphous wires using high-pass filter and micro field sensor[J].IEEE Transactions on Magnetics,1994(6):4626-4628. |
| [5] | S. S. Yoon;B. S. Lee;Y. W. Rheem;S. J. Ahn;C. G. Kim;C. O. Kim .Separation of Circumferential Magnetic Components From MI Spectra in Laser-Annealed Co-Based Amorphous Microwires[J].IEEE Transactions on Magnetics,2003(5):3292-3294. |
| [6] | Mandal K.;Mandal SP.;Vazquez M.;Puerta S.;Hernando A. .Giant magnetoimpedance effect in a positive magnetostrictive glass-coated amorphous microwire - art. no. 064402[J].Physical Review.B.Condensed Matter,2002(6):4402-0. |
| [7] | Horia Chiriac;Tibor-Adrian Ovari .Giant Magnetoimpedance Effect in Soft Magnetic Wire Families[J].IEEE Transactions on Magnetics,2002(5):3057-3062. |
| [8] | Chiriac H;ovari T A .Amorphous glass-covered magnetic wires:Preparation,properties,applications[J].Progress in Materials Science,1996,40(05):333-407. |
| [9] | C. M. Cai;K. Usami;M. Hayashi;K. Mohri .Frequency-Modulation-Type MI Sensor Using Amorphous Wire and CMOS Inverter Multivibrator[J].IEEE Transactions on Magnetics,2004(1):161-163. |
| [10] | Gomez-Polo C;Vazquez M;Knobel M .Rotational giant magnetoimpedance in soft magnetic wires:Modelization through Fourier harmonic contribution[J].Applied Physics Letters,2001,78:246-248. |
| [11] | Chizhik A;Ganzalez J;Yamasaki J et al.Vortex-type domain structure in Co-rich amorphous wires[J].Journal of Applied Physics,2004,95:2933-2936. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%