Thickness effect on magnetic properties of nanocrystalline CoFeBN soft magnetic thin films

High-frequency characteristics of (Fe7Co3)1−xBx and (Fe7Co3)BN thin films

“…2 represents the magnetic domain structure of (Fe 7 Co 3 ) 83.6 B 9.6 N 6.8 film measured by magnetic force microscopy (MFM). Although separated domains with a width of 0.2-0.3 mm instead of completely parallel strips are found, this figure clearly shows that the N addition creates the compressive stress, which was known to induce the perpendicular anisotropy [5,9]. Therefore, it may be concluded that the (Fe 7 Co 3 )BN thin films have perpendicular anisotropy energy caused by compressive stress.…”

“…However, these excellent high-frequency properties were obtained within a limited thickness of 100-150 nm [8,9]. In this study, highfrequency characteristics of $300 nm thick (Fe 7-Co 3 ) 1Àx B x and (Fe 7 Co 3 )BN films were appraised by numerical calculation based on a Landau-Lifshitz-Gilbert (LLG) equation in order to understand the above behaviors.…”

The evolution of magnetic, electrical and structural properties of nanogranular [FeCoBN/SiN]×n thin films

“…about 13.2 Â 10 À7 O m) [1]. At the same time, it was observed that the coercive force of these samples increased abruptly over a certain thickness [2]. The limitation due to thickness can be avoided by the utilization of multilayer structures such as magnetic material/non-magnetic materials.…”

Effect of multilayer structure on high-frequency properties of FeCo/(FeCo)0.63(SiO2)0.37 nanogranular films on flexible substrates

“…For the monolayer ferromagnetic films, it is promising to achieve high microwave permeability to increase film thickness. However, the negative influence, the serious skin effect and eddy current [4,5], and the obvious out-of-plane anisotropy in the high frequency, will block the increasing of the permeability, while the thin magnetic films, with specific multilayer structure design, can efficiently avoid the above negative effect and improve high-frequency properties by leading into different dielectric layers [6]. In this study, FeCo-SiO 2 monolayer films and FeCo/(FeCo) 0.63 (SiO 2 ) 0.37 multilayer films were prepared by co-sputtering and tandem sputtering on flexible substrates, respectively, and in order to discuss the improvement of multilayer films, the high-frequency properties of both films whose FeCo content was about 72 at % were investigated.…”