Abstract
For high frequency device applications, a systematic study of the soft magnetic properties and magnetization dynamics of (FeCo)-Al alloy thin films has been carried out. A low effective damping parameter αeff of 0.002 and a high saturation magnetization of about 1,800 emu/cc are obtained at y=0.2∼0.3 for (Fe1-yCoy)98Al2 alloy thin films deposited onto fused silica and MgO(100) at an ambient temperature during deposition. Those films are of the bcc structure with the <110> orientation normal to the film plane. They possess a columnar structure, grown along the film normal. The column width is found to be about 20 nm for y=0.25. It is concluded that the (FeCo)-Al thin films with a damping parameter as low as 0.002 and high saturation magnetization of about 1,800 emu/cc have been successfully fabricated, and that they are potential for future high frequency device applications.
Highlights
For soft magnetic materials for future high frequency device applications, a further improvement for high saturation magnetization, high permeability, low coercivity and low damping parameter must be realized
Very few works on the soft magnetic properties including the damping parameter in Fe-Al thin films can be found in literature
The film compositions for all samples under consideration were analyzed by X-ray photoelectron spectroscopy (XPS)
Summary
For soft magnetic materials for future high frequency device applications, a further improvement for high saturation magnetization, high permeability, low coercivity and low damping parameter must be realized. The rapidly quenched amorphous ribbons of Fe16wt.%Al were reported to exhibit very low coercivity Hc of 16A/m.2. Fe-1wt.%Al and Fe-5wt.%Al via power metallurgical process were reported to exhibit high permeability μ of 4,250 and 4,367 and low Hc of 90 A/m and 64 A/m, respectively.[3,4] very few works on the soft magnetic properties including the damping parameter in Fe-Al thin films can be found in literature. A systematic study has been carried out to examine the magnetic properties and structure of (FeCo)Al thin films in order to explore a novel soft magnetic material for future high frequency device applications
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