FeTiB film materials: Dependence of the magnetic properties and magnetic structure on the phase and structural states

•Nanocrystalline films Fe99.2÷56.6Ti0÷13.2B0÷34 are prepared by dc magnetron deposition.•The phase and structural states determine their magnetic properties and magnetic structure parameters.•The existence of intergranular exchange interaction was demonstrated.•Stochastic magnetic structure of the films was comprehensively analyzed.•The nature of the anisotropy field of the system was clarified. The Fe99.2÷56.6Ti0÷13.2B0÷34 films were prepared by dc magnetron deposition on glass substrates. X-ray diffraction analysis was used to determine the phase composition, volume fractions of formed crystalline phases, their grain sizes and microstrains on the grain scale. The magnetic hysteretic properties, saturation induction Bs (2.1–0.3 T), coercive field Hc (0.6–6 kA/m), relative remanence Br/Bs (0.07–0.37), were determined using measured hysteresis loops. Their shapes indicate the existence of intergranular exchange interaction in all studied films. The magnetic structure parameters of the films were determined by correlation magnetometry. All films are characterized by a stochastic magnetic structure. The magnetic properties and the magnetic structure parameters of the films are substantiated by their phase and structural states. The values of the local parameters of the magnetic structure (rms local anisotropy field D1/2Ha and exchange field HR) follow the parameters of the grain (lattice parameter and grain size), while the macroscopic parameters (Hc and rms stochastic domain anisotropy field D1/2 ) have a more complex behavior.