Nanocomposites and nanomaterials

FMR in the ribbons of Fe73.5Cu1Nb3Si13.5B9

Yuri Kobljanskyj1, Andrii Sizhuk1, Vladimir Malyshev1, Zhao Zhenjie2,  Sun Zhuo2
1Taras Shevchenko Kyiv National University, Glushkova ave. 4g, Kyiv, Ukraine
E-mail: mga@univ.kiev.ua 
2 Shanghai East China Normal University, Shanghai, China
Magnetic nanomaterials have become widely used as functional material components in power electronics. For example, the powder cores of FeCuNbSiB have better high frequency characteristic in MHz frequency band in comparison with other iron-based materials (see [1]). The microwave properties of the soft magnetics have potential for microwave application. The study of FMR in the soft magnetic materials can provide us with the deeper understanding of the distribution of magnetization, collective spin excitations etc. In this work the FMR spectrums of the amorphous and nanocrystalline micro-ribbons of Fe73.5Cu1Nb3Si13.5B9 in SHF field of 9.4 GHz are presented. The relatively symmetric line-shape of ferromagnetic resonance was experimentally observed for the annealed (nanocrystalline) ribbon (see Fig. 1). In comparison with the amorphous ribbon, the signal swing is approximately two times higher. Therefore, the annealed sample shows behavior typical for high quality ferromagnetic films in SHF field.   

Fig. 1. The FMR spectrum, differential signal power dP/dH, of the amorphous (as cast) and annealed ribbons Fe73.5Cu1Nb3Si13.5B9 at 9.4 GHz and room temperature.

1. Wang W., Xiao Y.D., Zhou J., Peng K., Lin J.P., Cui Y.F. and Xiao Z.B. Fabrication and magnetic properties of FeCuNbSiB soft magnetic cores // Min Metall Eng.- 2009.- 29.- P. 95-99.