Magnetism

Changes in the ferromagnetic resonance and magnetic anisotropy spectra of multilayer heterostructures [CoFeB/SiO$_2$|Bi$_2$Te$_3$]$_{47}$ when applying Fe/Fe$_3$O$_4$ nanoparticles to their surface

A. I. Bezverkhnii^ab, R. B. Morgunov<sup>ab

a</sup> Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, Russia
^b I. M. Sechenov First Moscow State Medical University, Moscow, Russia

Abstract: The ferromagnetic resonance method revealed an increase in the anisotropy constant of the heterostructure [CoFeB/SiO$_2$|Bi$_2$Te$_3$]$_{47}$ under the action of magnetic Fe/Fe$_3$O$_4$ nanoparticles deposited on the surface of the heterostructure by 20%. It has been established that a layer of Fe/Fe$_3$O$_4$ nanoparticles $\sim$ 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/SiO$_2$|Bi$_2$Te$_3$]$_{47}$.

Keywords: ferromagnetic resonance, magnetic anisotropy, multilayer heterostructures, magnetic dipole interaction, nanoparticles.

Received: 12.04.2022
Revised: 12.04.2022
Accepted: 19.04.2022

DOI: 10.21883/FTT.2022.08.52693.344

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