Kasama, Takeshi and Harrison, Richard J. and Church, Nathan S. and Nagao, Masahiro and Feinberg, Joshua M. and Dunin-Borkowski, Rafal E. (2013) Ferrimagnetic/ferroelastic domain interactions in magnetite below the Verwey transition. Part I: electron holography and Lorentz microscopy. Phase Transitions, 86 (1). pp. 67-87. ISSN 0141-1594 DOI 10.1080/01411594.2012.695373Full text not available from this repository.
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  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.
|Additional Information:||Special issue: Domain Boundary Engineering in Functional Oxides|
|Uncontrolled Keywords:||2012AREP; IA65;|
|Subjects:||03 - Mineral Sciences|
|Divisions:||03 - Mineral Sciences|
|Journal or Publication Title:||Phase Transitions|
|Page Range:||pp. 67-87|
|Depositing User:||Sarah Humbert|
|Date Deposited:||26 Jan 2013 11:25|
|Last Modified:||23 Jul 2013 10:05|
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