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Permeability and Magnetic Properties of Ferromagnetic NiFe/FeCoBSi Bilayers for High-Frequency Applications

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4 Author(s)
Gerber, A. ; Smart Mater. Group, Center of Adv. Eur. Studies & Res. (Caesar), Bonn ; McCord, J. ; Schmutz, C. ; Quandt, E.

In order to adjust the ferromagnetic resonance (FMR) frequency of thin NiFe films, ferromagnetic polycrystalline/amorphous NiFe/FeCoBSi bilayers using radio frequency magnetron sputtering were produced. Herein, the higher anisotropy field Hk of a ferromagnetic FeCoBSi was used to shift the FMR-frequency of the bilayer. Static and dynamic magnetic properties of the films were investigated by quasi-static magnetometry and by high frequency permeability measurements, respectively. The dynamic anisotropy field Hkdyn calculated from the FMR frequency of a single 100-nm NiFe-layer is shifted from mu0Hkdyn=0.5 mT to mu0Hkdyn=2.8 mT in a FeCoBSi(80 nm)/NiFe(20 nm) bilayer; whereas, the FMR frequency is congruently enhanced from 0.9 to 2.0 GHz. The permeability decreased from mu=2000 to mu=500. A linear dependence for the adjustment of the relevant magnetic parameters with NiFe:FeCoBSi ratio is demonstrated, opening the possibility to individually tailor magnetic properties of magnetic films for high-frequency applications

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 6 )