Changes in the ferromagnetic resonance and magnetic anisotropy spectra of multilayer heterostructures [CoFeB/SiO-=SUB=-2-=/SUB=-|Bi-=SUB=-2-=/SUB=-Te-=SUB=-3-=/SUB=-]-=SUB=-47-=/SUB=- when applying Fe/Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=- nanoparticles to their surface

Abstract

The ferromagnetic resonance method revealed an increase in the anisotropy constant of the heterostructure [CoFeB/SiO2|Bi2Te3]47 under the action of magnetic Fe/Fe3O4 nanoparticles deposited on the surface of the heterostructure by 20%. It has been established that a layer of Fe/Fe3O4 nanoparticles ~27 nm thick on a GaAs diamagnetic substrate has its own magnetic anisotropy caused by the magnetic dipole interaction between the particles. A layer of nanoparticles bound by magnetic dipole interaction forms an equivalent magnetic film, the scattering field of which changes the effective magnetic anisotropy of the heterostructure CoFeB/SiO2|Bi2Te3]47. Keywords: ferromagnetic resonance, magnetic anisotropy, multilayer heterostructures, magnetic dipole interaction, nanoparticles.