Determination of domain wall chirality using in situ Lorentz transmission electron microscopy
Abstract
Controlling domain wall chirality is increasingly seen in non-centrosymmetric materials. Mapping chiral magnetic domains requires knowledge about all the vector components of the magnetization, which poses a problem for conventional Lorentz transmission electron microscopy (LTEM) that is only sensitive to magnetic fields perpendicular to the electron beams direction of travel. The standard approach in LTEM for determining the third component of the magnetization is to tilt the sample to some angle and record a second image. This presents a problem for any domain structures that are stabilized by an applied external magnetic field (e.g. skyrmions), because the standard LTEM setup does not allow independent control of the angle of an applied magnetic field, and sample tilt angle. Here we show that applying a modified transport of intensity equation analysis to LTEM images collected during an applied field sweep, we can determine the domain wall chirality of labyrinth domains in a perpendicularly magnetized material, avoiding the need to tilt the sample.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 23, 2017
- Source ID
- 10.1063/1.4977500
Entities
People
- Benjamin J. Mcmorran
- Eric E Fullerton
- Jordan J. Chess
- Sergio Montoya
Organizations
- Air Force Research Laboratory
- M J Murdock Charitable Trust
- National Science Foundation
- Office of Basic Energy Sciences
- University of California
- University of California, San Diego
- University of Oregon
- W. M. Keck Foundation