Microwave Frequency Performance and High Magnetic Anisotropy of Nanocrystalline Fe<SUB>70</SUB>Co<SUB>30</SUB>-B Films Prepared by Composition Gradient Sputtering

Abstract

The fabrication and high-frequency ferromagnetic performances of nanocrystalline Fe 70 Co 30 -B soft magnetic films were investigated. It is revealed that the composition gradient sputtering method dramatically improves the high-frequency soft magnetic properties of the as-prepared films. This method gives rise to almost a linearly-increased distribution of compositions and residual stress. As a result, a very high ferromagnetic resonance frequency up to 6.7 GHz, high uniaxial magnetic anisotropic field up to 450 Oe, and low magnetic loss were obtained in as-deposited samples, which are particularly in favor of the integration between magnetic films and microwave components.

Electromagnetic wave absorbing properties and hyperfine interactions of Fe—Cu—Nb—Si—B nanocomposites

“…Electromagnetic properties (permittivity and permeability) of magnetic materials are important for the performances of many electronic devices operating at high frequency. [1,2] For example, the electromagnetic noise suppression in the field of electromagnetic compatibility (EMC) requires the materials having large magnetic losses or dielectric losses. [3,4] With increasing the operation frequencies of electronic devices upward to gigahertz (GHz), for instance, wireless local area network system (2.4 GHz) and active radio frequency identification label (2.45 GHz), it is imperative to develop materials which have good electromagnetic properties.…”