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Published on: June 23, 2023
A method for estimating magnetic field of TEM objective lens
D A Tatarskiy1, N S Gusev1, S A Gusev2
1Institute 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.
This study introduces a new method to calibrate the magnetic field in transmission electron microscope objective lenses. The technique uses Fresnel imaging of magnetic disks to accurately measure the field, enhancing magnetic material analysis.
Area of Science:
- Materials Science
- Physics
- Electron Microscopy
Background:
- Accurate calibration of magnetic fields in transmission electron microscopes (TEM) is crucial for advanced imaging.
- Existing methods may lack precision or require complex setups.
Purpose of the Study:
- To develop and validate a novel method for calibrating the objective lens magnetic field in a TEM.
- To enable precise quantitative magnetic measurements using Lorentz electron microscopy.
Main Methods:
- Utilizing classical Fresnel imaging of Permalloy disks within the TEM.
- Measuring the displacement of the magnetic vortex core under varying objective lens excitations and sample tilts.
- Employing a Carl Zeiss LIBRA 200 MC TEM for Lorentz electron microscopy.
Main Results:
- Successfully calibrated the objective lens magnetic field using the proposed Fresnel imaging technique.
- Demonstrated the method's effectiveness on Co/Pt multilayered films with established magnetic properties.
Conclusions:
- The developed method provides a reliable approach for objective lens magnetic field calibration in TEM.
- This technique enhances the capability of Lorentz electron microscopy for characterizing magnetic materials.
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