Giant Magnetoimpedance of Cube/Feconi Electroplated Wires: Focus on Angular Sensoric
- 1 Department of Electricity and Electronics, University of the Basque Country UPV-EHU, Campus of Leioa, Leioa, Spain; Department of Magnetism and Magnetic Nanomaterials, Ural Federal University, Ekaterinburg, Russia
- 2 Department of Physics, Kasetsart University, Bangkok, Thailand
- 3 Department of Physics, University of Oviedo, Oviedo, Spain
- 4 Department of Magnetism and Magnetic Nanomaterials, Ural Federal University, Ekaterinburg, Russia
Abstract
Giant magnetoimpedance effect (GMI) is a subject of special interest proved by applied electrodynamic and techno logical applications. GMI effect in ferromagnetic tubes is connected with the high sensitivity of the magnetic system to a circular magnetic field near the spin-reorientation magnetic phase transitions offering high sensitivity with respect to an external magnetic field. In this work the non-magnetic CuBe wires were covered by Fe 20 Co 6 Ni 74 layers by electro deposition. The thickness of 1 μm for magnetic layer was high enough in order to ensure the high GMI value. Longitu dinal magnetic anisotropy was induced by post preparation annealing in a magnetic field of 160 A/m at 320℃ during 1 hour in order to obtain appropriate magnetisation process. Angular dependencies of GMI were measured in a frequency range of 1 to 10 MHz for driving currents of 2.5 to 20 mA. High longitudinal GMI of the order of 400% was observed at quite low frequency of 1 MHz. The highest value of the sensitivity of 520%/Oe was found for the active resistance: Linear sensitivities of 0.023 Ω/° and 0.05 Ω/° were observed for reasonably low fields of 240 and275 A/m respectively for small angles, where planar GMI elements are less effective.
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