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High Frequency Characteristics of Nanocrystalline Co-Fe-Hf-O Soft Magnetic Films

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.
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Submitted on : Wednesday, January 1, 1997 - 8:00:00 AM
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Y. Hayakawa, K. Ohminato, N. Hasegawa, A. Makino. High Frequency Characteristics of Nanocrystalline Co-Fe-Hf-O Soft Magnetic Films. Journal de Physique IV Colloque, 1997, 07 (C1), pp.C1-495-C1-496. ⟨10.1051/jp4:19971202⟩. ⟨jpa-00254853⟩

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