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Abstract: 

Direct and localized imaging of magnetic textures at the nanoscale is essential for the development of advanced electronic and spintronic devices, where precise control over magnetic properties is crucial. Magnetic contrast imaging using a (scanning) transmission electron microscope ((S)TEM), commonly known as Lorentz microscopy, enables high-resolution visualization of magnetic textures and their dynamics, providing valuable insights into their nucleation, manipulation, and evolution.

In Lorentz mode, the microscope’s objective lens is turned off, creating a zero-magnetic-field environment. This is essential for observing the intrinsic magnetic structure of the sample without external interference. By adjusting the current in the objective lens, controlled magnetic fields can be applied to the sample, allowing manipulation of magnetic textures. When combined with an in situ TEM holder, this setup enables real-time observation of how magnetic textures respond to external stimuli, such as temperature variations, applied bias voltage, or current.

This presentation will introduce (S)TEM-based magnetic contrast imaging techniques, with a focus on in situ Lorentz TEM. It will discuss its applications, explore its advantages, and limitations in imaging and studying magnetic textures.    

by Núria Bagués Salguero

InCAEM Project