Lorentz transmission electron microscopy of ferromagnetic nanodisks

Abstract

The report presents the results of an experimental study on the observation of inhomogeneous magnetic distributions by the Lorentz electron microscopy method in Permalloy nanodisks and Co/Pt multilayer films. Magnetic nanodisk systems were used to calibrate the magnetic field in the objective lens of the microscope LIBRA 200MC. The magnetic properties of Co/Pt multilayer films were locally modified by irradiation with a sharply focused ion beam in a scanning helium ion microscope. As a result of such irradiation, periodic lattices of inhomogeneous magnetization distributions were formed in continuous films, the spin configuration of which depends on the dose of local irradiation.