Influence of total film thickness on high-frequency magnetic properties of the [FeCoSiN/SiNx]n multilayer thin films

Preparation and high-frequency soft magnetic property of FeCo-based thin films

“…3a, b). The small satellite peaks (binding energy at around 711.4 and 782.3 eV) are vested in the Fe-N bonds and Co-N bonds, respectively (the detailed analysis was well established in other publication [13]). In addition, it can be clearly observed that the positions of Fe 2p and Co 2p spectra slightly shift to lower binding energy from FeCo to [FeCoSiN/SiN x ] n multilayer thin film.…”

Origin of perpendicular magnetic anisotropy in amorphous thin films

“…The Landau–Lifschitz–Gilbert (LLG) equation (see Eq. 1 ) was used to calculate the Gilbert damping constant, α, for the films with dominant in-plane uniaxial anisotropy (i.e., films deposited under low deposition pressure) 41 where M S is the saturation magnetisation, H k is the anisotropy field, γ is the gyromagnetic ratio, t is the thickness of the film and δ is the skin depth as The damping factor, α , describes the ease of the spins to undergo magnetisation reversal at high frequencies 42 . One would expect the loss of the material to be substantial at high frequencies if the value of α is significantly large.…”

High-frequency Magnetic Properties of [Fe80Ni20-O/SiO2]n Multilayer Film Served as Magnetic Core of Solenoid Inductor

“…However, the high-frequency magnetic performance of the magnetic granular films and monolayer films are drastically degenerated due to the large grain size and strong inner stress when the film thickness rise to a few hundreds of nanometers. We discover that the laminated structure film can help to maintain the microstructure unchanged and promoted good high-frequency soft magnetic properties even though the total thickness exceeding 1 micrometer [13]. According to our previous research, the [Fe 80 Ni 20 -O/SiO 2 ] n multilayer films, with Fe 80 Ni 20 -O layer thickness of 5 nm and SiO 2 layer thickness of 3 nm, demonstrated good quality high-frequency performance with a low coercivity of 5.1 Oe, high ferromagnetic resonance of 2.5 GHz, and high permeability of 150 [12], which makes these films had promising prospect as magnetic core materials for solenoid inductors operating in GHz frequency range.…”