%0 Journal Article
%A Kasama, Takeshi
%A Harrison, Richard J.
%A Church, Nathan S.
%A Nagao, Masahiro
%A Feinberg, Joshua M.
%A Dunin-Borkowski, Rafal
%T Ferrimagnetic/ferroelastic domain interactions in magnetite below the Verwey transition. Part I: electron holography and Lorentz microscopy
%J Phase transitions
%V 86
%N 1
%@ 1029-0338
%C London [u.a.]
%I Taylor & Francis
%M FZJ-2015-03923
%P 67 - 87
%D 2013
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000312586700007
%R 10.1080/01411594.2012.695373
%U https://juser.fz-juelich.de/record/201629