Magnetization processes in heterogeneous magnetic ribbons and the upgrade of the committed experimental methods




                                                                                                                    VEGA project No. 2/5099/25

                                                                                                                                Duration: 2005 - 2007
                             Principal Investigator: Pavol Butvin

                             Scientific co-worker: Beata Butvinová (deputy)

                                                    

    The project is intended to explain specific influence of so-called macroscopic heterogeneity on the magnetization processes in rapidly quenched soft-magnetic ribbons. This scope is selected considering the experience gained so far as well as preferring the directly applicable properties. The research is directed along two lines: a) to elucidate the origin, function and relevance which a transverse (relative to the ribbon's long axis) anisotropy component bears to the magnetization process. Within the materials research context we test here the hypothesis, which assigns the heterogeneity a fair significance as to the origin of the transverse component. Line b) bears the methodic context aiming to clarify the physical essence of a peculiar response observed on certain variations of incremental permeability. We try to recognize whether and on what terms the experimental arrangement or the material properties are essential to the unusual response. The development of devoted experimental facilities in order to add information value to the method of incremental permeability also adheres to this line. The second experinental bulwark of the theme - observation of domain structure should  as well be improved under the auspices of the partner (as it is run abroad within international cooperation).

 

Publications:

1) J. Sitek, J. Degmová, K. Sedlačková, P. Butvin, External influence on magnetic properties of Fe- based nanocrystalline alloys, Journal of Magnetism and Magnetic Materials 304 (2006), pp. e697–e699.

 2) P. Butvin, B. Butvinová, J. Sitek, J. Degmová, G. Vlasák, P. Švec, D. Janičkovič, Magnetic properties and macroscopic heterogeneity of FeCoNbB Hitperms, Journal of Magnetism and Magnetic Materials (in press).

3) B.Butvinová, P.Butvin, G.Vlasák, P.Švec and D.Janičkovič, Secondary Magnetic Anisotropy in Hitperms, 13-th Intern. Symposium on Metastable and Nano Materials 2006, August 27-31.2006, Warsaw, Poland; Journal of Alloys and Compounds ( in press).

4) J. Degmová, J. Sitek, P. Butvin, Bulk and Surface Analysis of FeCoNbB Alloys, Sixth Seeheim workshop on Mössbauer spectroscopy : June 07÷11, 2006. 

5)J. Sitek, J. Degmová, P. Butvin, Influence of tensile stress on nanocrystalline alloys, 11th International Workshop on Applied Physics of Condensed Matter – APCOM2005, pp.9-12. Žilina, 2005, University of Žilina.

6) P. Butvin, R. Schäfer, B. Butvinová, J. Sitek, Long-range stresses and magnetic anisotropy in heterogeneous nanocrystalline ribbons, 17-th Intern. conference Soft Magnetic Materials, 7- 9.09.2005 Bratislava , Book of Abstracts, 128.

7) B. Butvinová, P. Butvin, J. Sitek, G. Vlasák, P. Švec, D. Janičkovič, J. Degmová, Magnetic properties and macroscopic heterogeneity of Zr-free Hitperms, 17-th Intern. conference Soft  Magnetic Materials, 7-9.09.2005 Bratislava, Book of Abstracts, 129.


 Cooperations:

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