Optimization of tunable GHz micro-antennas based on Giant magnetoimpedance

•Amorphous magnetic microwires have been annealed between to tailor its microstructure.•Microwire length influence on the scattering coefficient of GHz waves has been studied.•The maximum scattering, occurs at the antenna resonance.•Low frequency magnetic field modifies scattering by means of giant...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-01, Vol.469, p.289-295
Main Authors: Archilla, D., Moya, A., Hernando, A., Marín, P.
Format: Article
Language:English
Subjects:
Amorphous materials
Anisotropy
Antennas
Dipole antennas
Giant magnetoimpedance
Magnetic anisotropy
Magnetic fields
Magnetic permeability
Magnetic properties
Magnetostriction
Microwave detectors
Microwaves
Optimization
Stress relaxation
Tunnels
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Summary:•Amorphous magnetic microwires have been annealed between to tailor its microstructure.•Microwire length influence on the scattering coefficient of GHz waves has been studied.•The maximum scattering, occurs at the antenna resonance.•Low frequency magnetic field modifies scattering by means of giant magnetoimpedance.•Maxima effect for the highest longitudinal anisotropy but lower electrical resistivity.•The observed effect is useful for new contact-less current and temperature sensors. The unique magnetic properties of amorphous magnetic microwires (AMMW), in particular its interaction with microwaves by means of Giant Magnetoimpedance effect and its magnetostrictive character allow the development of tunable GHz micro-antennas useful as contactless sensing elements with applicability in many fields including biomedical. The possibility of using a single AMMW for this purpose demands the optimization and control of its electrical and magnetic properties in order to adapt them to our needs. In this work we study the changes on electrical resistance and magnetic permeability due to the stress relaxation and to the nanocrystallization induced by thermal treatments in AMMW of composition (Fe2.25Co72.25Si10B15), obtaining important variations in the sensing capability.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.08.049