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Analysis of magnetic transitions through the magnetoimpedance effect

C. GÓMEZ-POLO1,* , V. RECARTE1, J. I. PÉREZ-LANDAZABAL1

Affiliation

  1. Departamento de Física. Universidad Pública de Navarra. Campus de Arrosadia 31006 Pamplona. Spain

Abstract

The temperature dependence of the magnetoimpedance effect represents a powerful research tool in the analysis of those magnetic transitions associated with changes in the magnetic permeability of the system. Both, in the low frequency region (magnetoinductance effect) and in the higher frequency regime where the skin effect takes place, the AC complex impedance, Z, is mainly determined by the transverse magnetic permeability. Thus, its temperature dependence and its evolution under applied external magnetic field, Z(T, H), are directly correlated with the temperature dependence of the basic magnetic parameters, in particular, the magnetic permeability of the system. In this work, this AC magnetotransport effect has been employed to analyse the characteristic transition in two magnetic systems: (i) the magnetic transition in Fe based soft magnetic nanocrystalline alloys associated with the decoupling of the ferromagnetic crystallites around the Curie point of the residual amorphous phase; (ii) the martensitic transformation in ferromagnetic shape memory alloys (NiMnGa), from a highly anisotropic martensite phase to the austenite phase. The results indicate the suitability of this simple AC magnetotransport technique to analyse the main features of the characteristic magnetic transition of these systems..

Keywords

Magnetic transitions, Magnetoimpedance effect, Soft magnetic nanocrystalline alloys, Ferromagnetic shape memory alloys.

Submitted at: Sept. 5, 2006
Accepted at: Sept. 13, 2006

Citation

C. GÓMEZ-POLO, V. RECARTE, J. I. PÉREZ-LANDAZABAL, Analysis of magnetic transitions through the magnetoimpedance effect, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1660-1666 (2006)