Abstract
A methodology to fabricate ultrasoft CoFe nano-/microfilms directly via electrodeposition from a semineutral iron sulfate solution is demonstrated. Using boron-reducer as the additive, the CoFe films become very soft with high magnetic moment. Typically, the film coercivity in the easy and hard axes is 6.5 and 2.5 Oersted, respectively, with a saturation polarization up to an average of 2.45 Tesla. Despite the softness, these shining and smooth films still display a high-anisotropic field of ~45 Oersted with permeability up to 104. This kind of films can potentially be used in current and future magnetic recording systems as well as microelectronic and biotechnological devices.
Highlights
The ever expanding demand of the world market leads to magnetic recording data storage devices advancing toward much smaller exterior dimension and higher capacity [1, 2]
In order to achieve very high capacity and fast recording data storage in a miniature device, an ultrasoft and high magnetic moment material is required for producing highsaturation flux density (Bs), so that the necessary flux density can be preserved on reducing device dimensions, while simultaneously achieving a low coercivity (Hc) to match the hard magnetic media with high Hc, track density, and linear density [3]
Soft magnetic films with high moment are widely used in modern electromagnetic devices, such as high-frequency field-amplifying components, versatile communication tools, and magnetic shielding materials in tuners [4]
Summary
The ever expanding demand of the world market leads to magnetic recording data storage devices advancing toward much smaller exterior dimension and higher capacity [1, 2]. We demonstrate a novel approach to the fabrication of ultrasoft magnetic CoFe films via electrodeposition from a sulfate salt-based solution containing dimethylamine borane [(CH3)2NHBH3] (B-reducer, Bayer AG, Germany).
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