IMPACT OF MODIFIED ENDINGS ON NOISE CHARACTERISTICS OF Fe-BASED GLASS-COATED MICROWIRES

Miroslav Šmelko – Jozef Kravčák – Dušan Praslička – Josef Blažek – Katarína Draganová

   Amorphous glass-coated bistable microwires are characterized by unique magnetic properties usable in a wide range of technical applications. Almost all of them are based on the measurement of the switching field, at which the remagnetization process of the microwire occurs and the magnitude of which is influenced by the measured physical quantity, as for example tensile stress or temperature. The domain wall generation and the remagnetization of the microwire is a complicated thermody-namic and structural process accompanied with an uncertainty, which is observable as the switching field noise. This noise is then often a limiting factor of the microwires' sensoric application possibilities. The article deals with the influence of the mi-crowire ending structure on its noise characteristics. Noise of microwires with cut endings and also with chemically modified endings was analyzed. The initial experiments show a significant decrease of the switching field noise of microwires with chem-ically modified endings.

Keywords: microwire, noise, structural analysis

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