Influence of magnetization processes and device geometry on the GMI effect

Summary form only given. The use of Giant Magneto-Impedance as a mechanism for sensor design has been stressed in the past few years. Nowadays, some devices are already in the market and many different materials with various shapes have been tested for these sensors. In this paper we review the different geometries (wires, ribbons, films) and structures (either homostructures or sandwiches and plated wires) as well as the different materials (either amorphous or crystalline) and magnetization processes occurring in the GMI elements. The different character of the magnetic anisotropy in crystalline and amorphous alloys determines the type of magnetization process dominant in the material (either wall movement or magnetization rotation) as well as the single peak or double peak behaviour of the GMI. The wall movement results typically in larger permeability values and then in improved GMI ratios. However the damping of the walls rapidly reduces the effective permeability that becomes the one corresponding to that of rotation processes.

[1]  P. Tiberto,et al.  Hysteretic giant magneto impedance , 1998 .

[2]  David Ménard,et al.  Theory of longitudinal magnetoimpedance in wires , 2000 .

[3]  L. Kraus.  The theoretical limits of giant magneto-impedance , 1999 .

[4]  A. Hernando,et al.  Magnetic and transport eddy-current anomalies in cylinders with core-and-shell regions , 1999 .

[5]  J. González,et al.  Characterization of Joule-heated Co-rich amorphous alloys under applied tensile stress by the inductance spectroscopy method , 1999 .

[6]  Andrey N. Lagarkov,et al.  Theory of giant magneto-impedance effect in amorphous wires with different types of magnetic anisotropy , 1998 .

[7]  J. Barandiaran,et al.  Circular magnetisation measurement in ferromagnetic wires , 1978 .

[8]  J. L. Muñoz,et al.  AC impedance and circular permeability of slab and cylinder , 1999 .

[9]  K. Garcı́a,et al.  CIRCUMFERENTIAL MAGNETIZATION CURVES OF CO-RICH AMORPHOUS WIRES UNDER TENSILE STRESS , 1999 .

[10]  Alfredo García-Arribas,et al.  Magnetoimpedance of sandwiched films: experimental results and numerical calculations , 2002 .

[11]  L. V. Panina,et al.  Magneto-impedance in multilayer films , 2000 .

[12]  L. V. Panina,et al.  Magneto-inductive effect (MI effect) in amorphous wires , 1992 .

[13]  D. J. Mapps,et al.  Field-dependent surface impedance tensor in amorphous wires with two types of magnetic anisotropy: helical and circumferential , 2001 .

[14]  J. L. Muñoz,et al.  Frequency dependence of giant magnetoimpedance effect in CuBe/CoFeNi plated wire with different types of magnetic anisotropy , 2000 .

[15]  K. Garcı́a,et al.  Domain wall pinning, bulging, and displacement in circumferential domains in CoFeBSi amorphous wires , 2000 .

[16]  R. Beach,et al.  Sensitive field‐ and frequency‐dependent impedance spectra of amorphous FeCoSiB wire and ribbon (invited) , 1994 .

[17]  J. L. Muñoz,et al.  Domain wall permeability limit for the giant magnetoimpedance effect , 2002 .

[18]  Alfredo García-Arribas,et al.  Giant magnetoimpedance strip and coil sensors , 2001 .

[19]  J. L. Muñoz,et al.  MAGNETOIMPEDANCE OF METALLIC FERROMAGNETIC WIRES , 1998 .

[20]  J.E.L. Bishop,et al.  Modelling domain wall motion in soft magnetic alloys , 1984 .

[21]  Yutaka Nonomura,et al.  Thin film magnetic field sensor utilizing Magneto Impedance effect , 2000 .

[22]  Charles Kittel,et al.  Theory of the Dispersion of Magnetic Permeability in Ferromagnetic Materials at Microwave Frequencies , 1946 .

[23]  C. Chien,et al.  Longitudinal and transverse magneto‐impedance in amorphous Fe73.5Cu1Nb3Si13.5B9 films , 1995 .

[24]  J. Barandiaran,et al.  Giant magneto-impedance and its relaxation in Co–Fe–Si–B amorphous ribbons , 1997 .

[25]  L. Brunetti,et al.  Study of magneto impedance effect in the microwave frequency range for soft magnetic wires and microwires , 2000 .

[26]  H. Chiriac,et al.  Giant magnetoimpedance in glass-covered amorphous microwires , 2003 .

[27]  Giant Magneto-Impedance Effect in Amorphous Wires , 2001 .