Hysteresis in Asymmetrical GMI Effect in Amorphous Microwires

• Authors: J. Kravčák
• Languages of publication: EN

Abstracts

EN

The double-peak behaviour of giant magneto-impedance (GMI) dependence on the external magnetic field strength H is observed in as-cast glass-covered amorphous thin wire Co_{70.5}Fe_{4.5}Si_{15}B_{10} (microwire), as well as in microwire with the removed glass cover. The position of sharp peaks is symmetrical (H=± H_{m}) with respect to zero external magnetic field strength (H=0) and corresponds to the critical field of irreversible magnetization rotation. The maximum GMI ratio (ΔZ/Z)_{max} dependence on the amplitude of current i_{ac} at frequency of 1 MHz is analysed by means of the helical anisotropy (0<α<90°), induced during preparation of the microwire and after glass-cover removing. The additional dc bias current i_{dc} ≤ i_{ac} is applied in order to achieve asymmetrical GMI effect. Asymmetrical GMI dependences exhibit hysteresis which can be explained by irreversible magnetization rotation at ferromagnetic surface of the microwire.

Keywords

EN

75.30.Gw; 75.50.Kj; 75.60.Ej

Discipline

• 75.30.Gw: Magnetic anisotropy
• 75.60.Ej: Magnetization curves, hysteresis, Barkhausen and related effects(for hysteresis in ferroelectricity, see 77.80.Dj)
• 75.50.Kj: Amorphous and quasicrystalline magnetic materials

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 132-133

Dates

published

2014-07

Contributors

author

J. Kravčák

• Department of Physics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia

References

• [1] M. Vázquez, Physica B 299, 302 (2001), doi: 10.1016/S0921-4526(01)00482-3
• [2] L.V. Panina, K. Mohri, T. Uchiyama, M. Noda, IEEE Trans. Magn. 31, 1249 (1995), doi: 10.1109/20.364815
• [3] A. Chizhik, J.M. Blanco, A. Zhukov, J. Gonzalez, G. Garcia, P. Gawronski, K. Kulakowski, IEEE Trans. Magn. 42, 3889 (2006), doi: 10.1109/TMAG.2006.885433
• [4] M. Knobel, M. Vázquez, L. Kraus, in: Handbook of Magnetic Materials, 15, Ed. by K. H. J. Buschow, Elsevier Science B.V., 2003, p. 497
• [5] F.L.A. Machado, S.M. Rezende, J. Appl. Phys. 79, 6558 (1996), doi: 10.1063/1.361945
• [6] S. Chikazumi, Physics of Magnetism John Wiley & Sons, New York 1964, p. 281
• [7] J. Kravčák, R.Varga, Acta Phys. Pol. A 118, 762 (2010)
• [8] N.A. Usov, A.S. Antonov, A.N. Lagarkov, J. Magn. Magn. Mater. 185, 159 (1998), doi: 10.1016/S0304-8853(97)01148-7

Identifiers

DOI

10.12693/APhysPolA.126.132