A method for estimating magnetic field of TEM objective lens

D A Tatarskiy; N S Gusev; S A Gusev

doi:10.1016/j.ultramic.2023.113822

A method for estimating magnetic field of TEM objective lens

Ultramicroscopy. 2023 Nov:253:113822. doi: 10.1016/j.ultramic.2023.113822. Epub 2023 Jul 29.

Authors

D A Tatarskiy¹, N S Gusev², S A Gusev³

Affiliations

¹ Institute for Physics of Microstructures RAS, Department of Magnetic Nanostructures, Afonino, Akademicheskaya st.7, Nizhny Novgorod, 603087, Russia; Lobachevsky State University of Nizhny Novgorod, Gagarina ave. 23, Nizhny Novgorod, 603950, Russia. Electronic address: tatarsky@ipmras.ru.
² Institute for Physics of Microstructures RAS, Department of Magnetic Nanostructures, Afonino, Akademicheskaya st.7, Nizhny Novgorod, 603087, Russia; Lobachevsky State University of Nizhny Novgorod, Gagarina ave. 23, Nizhny Novgorod, 603950, Russia.
³ Institute for Physics of Microstructures RAS, Department of Magnetic Nanostructures, Afonino, Akademicheskaya st.7, Nizhny Novgorod, 603087, Russia.

PMID: 37586244
DOI: 10.1016/j.ultramic.2023.113822

Abstract

We propose a method for calibration of magnetic field in the objective lens of transmission electron microscope. The calibration process is based on classical Fresnel imaging of Permalloy disks and measuring the displacement of the magnetic vortex core when the sample is tilted at various excitations of the objective lens. We adopted the Carl Zeiss LIBRA 200 MC transmission electron microscope for Lorentz electron microscopy using this method. The objective lens magnetic field evaluation is tested on the Co/Pt multilayered films with known magnetic properties.

Keywords: Calibration; Lorentz microscopy; Magnetic vortex.