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Lecture

Lorentz Transmission Electron Microscopy: Theory and Practice

In course

MSE-670: Advanced Microscopy for Magnetic Materials

Theoretical and practical expertise is gained about the microscopy of spin structures and magnetic configuiations down to the sub-nm length and sub-ns time scales such as transmission electron microscopy, x-ray and light scattering, magnetic dichroism, and ...

Description

This lecture covers Lorentz Transmission Electron Microscopy (LTEM) theory, imaging modes, and quantitative analysis. It explains Lorentz force, magnetic induction, deflection angles, and phase shift quantification. Examples include magnetic domain structures and skyrmions.

Instructors (4)

Fabrizio Carbone

Birth 20/04/1976 Master degree: University of Pavia "optoelectronic engineering". September 2001. Reasearch scientist at Pirelli Labs, Milan Italy between September 2000 and August 2002. PhD in condensed matter physics from the University of Geneva, prof. van der Marel gorup. January 2007 Post doc in physical chemistry at Caltech in prof. Zewail`s group. March 2007-April 2009

Dirk Grundler

Thomas La Grange

Phoebe Marie Tengdin

Official source

Ontological neighbourhood

Physics

Condensed matter physics: Phase transitions

Related concepts (32)

Magnetic domain

A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction. When cooled below a temperature called the Curie temperature, the magnetization of a piece of ferromagnetic material spontaneously divides into many small regions called magnetic domains. The magnetization within each domain points in a uniform direction, but the magnetization of different domains may point in different directions.

Magnetic moment

In electromagnetism, the magnetic moment is the magnetic strength and orientation of a magnet or other object that produces a magnetic field. Examples of objects that have magnetic moments include loops of electric current (such as electromagnets), permanent magnets, elementary particles (such as electrons), composite particles (such as protons and neutrons), various molecules, and many astronomical objects (such as many planets, some moons, stars, etc).

Magnetic field

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets.

Electron diffraction

Electron diffraction refers to changes in the direction of electron beams due to interactions with atoms. Close to the atoms the changes are described as Fresnel diffraction; far away they are called Fraunhofer diffraction. The resulting map of the directions of the electrons far from the sample (Fraunhofer diffraction) is called a diffraction pattern, see for instance Figure 1. These patterns are similar to x-ray and neutron diffraction patterns, and are used to study the atomic structure of gases, liquids, surfaces and bulk solids.

Simulation

A simulation is the imitation of the operation of a real-world process or system over time. Simulations require the use of models; the model represents the key characteristics or behaviors of the selected system or process, whereas the simulation represents the evolution of the model over time. Often, computers are used to execute the simulation. Simulation is used in many contexts, such as simulation of technology for performance tuning or optimizing, safety engineering, testing, training, education, and video games.

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