Revealing magnetic domain structure in functional Fe2.5Zn 0.5O4 wires by transmission electron microscopy

Yasukazu Murakami, A. Ohta, A. N. Hattori, T. Kanki, S. Aizawa, T. Tanigaki, H. S. Park, H. Tanaka, D. Shindo

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Abstract

The magnetic and crystallographic microstructures in Fe 2.5Zn0.5O4 (FZO) wires fabricated using nano-imprint lithography, pulsed laser deposition and a molybdenum lift-off mask technique were studied by transmission electron microscopy (TEM). A process using a focused ion beam completely separated the FZO wires from the insulating MgO substrate, and accordingly allowed in-depth TEM studies of the domain structures. Observations using energy-filtered TEM demonstrated good crystallinity of the FZO wires. Both Lorentz microscopy and electron holography studies revealed unexpectedly small magnetic domains (∼100 nm or smaller) due to a significant interaction with antiphase boundaries. The role of antiphase boundaries on the functionalities observed in the constrained wires (e.g., nonlinear I-V characteristics and large magnetoresistance) is discussed on the basis of these microscopic observations.

Original languageEnglish
Pages (from-to)144-153
Number of pages10
JournalActa Materialia
Volume64
DOIs
Publication statusPublished - Feb 1 2014
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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