VEGA project No. 2/2035/22
                             Principal Investigator: Pavol Butvin

                             Investigators: Beata Butvinová

                                                     Emília Illeková
 
 

    The project is focused on the origin and the effect of different secondary magnetic anisotropies. Primary anisotropies (e.g. those controlled essentially by the chemical composition) are generally weak in actually soft ferromagnets. Thus secondary anisotropies induced by various additional influences on an as-cast material come to their own and effectively control the resulting magnetic properties. There already are several, extensively studied 'standard' secondary anisotropies (e.g. such as due to thermal treatment with no other influence than temperature, field annealing, rolling, coating). This project however aims rather to study the effects of less known, often unintended influences which can lead to so-called macroscopic heterogeneity. Nevertheless, as the heterogeneity reflects intrinsic material properties too, the intended study is expected to supplement significant new knowledge about modern soft-magnetic materials as a whole. On the other side, it is also intended to develop/improve particular high-performance magnetic devices as transformer cores and field sensors. The experimental line of the research will be anchored on thin ferromagnetic ribbons prepared by rapid quenching of the melt.

Publications:

• BUTVIN Pavol, PRASLIČKA Dušan, BLAŽEK Josef, BUTVINOVÁ Beata: "A relax type wide range field sensor using Finemet", Sensors and Actuators A 106 (2003), 22-25.

• BUTVINOVÁ Beata, BUTVIN Pavol, SCHÄFER Rudolf: "Influence of heterogeneity on magnetic response of nanocrystalline ribbons", Sensors and Actuators A 106 (2003), 52-55.

• BUTVIN Pavol, BUTVINOVÁ Beata, SCHÄFER Rudolf: "On subtle differences among low-anisotropy soft-magnetic ribbons", abstract in Proceedings of the Inter. Conference "Aplikovaná magnetometria 2003"- Acta Avionica V, (2003) No. 8/s - September, p. 12. (by AFA GMRŠ Košice )

• BUTVINOVÁ Beata, BUTVIN Pavol, SCHÄFER Rudolf, P. GRGAČ: "The role of omni-directional gas presure at thermal treatment of FeNbCuBSi ribbons", Archives of Materials Science, Vol. 25, No. 4 (2004) pp. 415-422.

Applications and cooperations:

• magnetic field sensors - GMRŠ Air Force Academy Košice and EDIS, Ltd. Košice
• precise electrometric current transformers - FEI STU, Bratislava
• magnetic domain structure observation - Institut für Festkörperphysik und Werkstofforschung Dresden, Germany

Last update: 09.03.2005