TY  - JOUR
AU  - Kasama, Takeshi
AU  - Harrison, Richard J.
AU  - Church, Nathan S.
AU  - Nagao, Masahiro
AU  - Feinberg, Joshua M.
AU  - Dunin-Borkowski, Rafal
TI  - Ferrimagnetic/ferroelastic domain interactions in magnetite below the Verwey transition. Part I: electron holography and Lorentz microscopy
JO  - Phase transitions
VL  - 86
IS  - 1
SN  - 1029-0338
CY  - London [u.a.]
PB  - Taylor & Francis
M1  - FZJ-2015-03923
SP  - 67 - 87
PY  - 2013
AB  - The crystallographic and magnetic microstructure of magnetite (Fe3O4) below the Verwey transition (∼120 K) is studied using transmission electron microscopy. The low temperature phase is found to have a monoclinic C-centered lattice with a c-glide plane perpendicular to the b-axis, which allows twin-related crystal orientations to be distinguished. Off-axis electron holography and Lorentz electron microscopy are used to show that magnetic domains present at room temperature become subdivided into sub-micron-sized magnetic domains below the Verwey transition, with the magnetization direction in each magnetic domain oriented along the monoclinic [001] axis. The nature of the interactions between the magnetic domain walls and the ferroelastic twin walls is investigated. Cooling and warming cycles through the transition temperature are used to show that a memory effect is likely to exist between the magnetic states that form above and below the transition. Our results suggest that ferroelastic twin walls have a strong influence on the low temperature magnetic properties of magnetite.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000312586700007
DO  - DOI:10.1080/01411594.2012.695373
UR  - https://juser.fz-juelich.de/record/201629
ER  -