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Title: Determination of domain wall chirality using in situ Lorentz transmission electron microscopy

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. Furthermore, 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.
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. Univ. of Oregon, Eugene, OR (United States)
  2. Univ. of California, San Diego, CA (United States); Univ. of California, San Diego, La Jolla, CA (United States)
Publication Date:
Grant/Contract Number:
SC0010466; SC0003678
Type:
Published Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Oregon, Eugene, OR (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Domain walls; Chiral symmetries; Magnetic fields; Magnetic induction; Nucleation
OSTI Identifier:
1349368
Alternate Identifier(s):
OSTI ID: 1393529; OSTI ID: 1421279