Ferrimagnetic/ferroelastic domain interactions in magnetite below the Verwey transition. Part I: Electron holography and Lorentz microscopy

Takeshi Kasama, Richard J. Harrison, Nathan S. Church, Masahiro Nagao, Joshua M. Feinberg, Rafal E. Dunin-Borkowski

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The crystallographic and magnetic microstructure of magnetite (Fe 304) below the Verwey transition (∼120K) 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 A-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.

Original languageEnglish
Pages (from-to)67-87
Number of pages21
JournalPhase Transitions
Volume86
Issue number1
DOIs
Publication statusPublished - 2013 Jan
Externally publishedYes

Keywords

  • Ferroelastic twins
  • Low temperature magnetic properties
  • Magnetite
  • Multiferroics
  • Transmission electron microscopy
  • Verwey transition

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)

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