High Frequency Characteristics of Nanocrystalline Co-Fe-Hf-O Soft Magnetic FilmsReport as inadecuate




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Abstract : The microstructure, electrical resistivity, and high frequency soft magnetic properties of nanocrystalline Co-Fe-Hf-O films were investigated. The films were prepared by rf reactive sputtering technique in Ar + O2 mixed atmosphere under a static magnetic field or no field. In an as-deposited state, a Co44.3Fe19.1Hf14.5O22.1 film deposited in a static field consists of mixed structure of amorphous phase and bcc nanocrystals with 3 - 4 nm in diameter. The real part ν of complex permeability of 160 is almost constant up to 1GHz, and extremely high µ-µ- of 61 at 100 MHz is obtained. These high frequency characteristics are caused by the high electrical resistivity μ of 13 µΩm and large anisotropy field Hk of 4.8 kA-m.





Author: Y. Hayakawa K. Ohminato N. Hasegawa A. Makino

Source: https://hal.archives-ouvertes.fr/



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