Iron vacancy ordered γ-Fe2O3(001) epitaxial films: The crystal structure and electrical resistivity

Hideto Yanagihara; Manabu Hasegawa; Eiji Kita; Yusuke Wakabayashi; Hiroshi Sawa; Kiiti Siratori

doi:10.1143/JPSJ.75.054708

Iron vacancy ordered γ-Fe₂O₃(001) epitaxial films: The crystal structure and electrical resistivity

Hideto Yanagihara, Manabu Hasegawa, Eiji Kita, Yusuke Wakabayashi, Hiroshi Sawa, Kiiti Siratori

SCI - Physics

Research output: Contribution to journal › Article › peer-review

52 Citations (Scopus)

Abstract

We report the structural characterization and transport properties of highly-ordered epitaxial γ-Fe₂O₃ thin films grown by a pure ozone-assisted molecular beam epitaxy method. X ray diffraction (XRD) measurements at a synchrotron facility indicated that the composition of films was close to that of γ-Fe₂O₃ with Fe vacancy only occurring at octahedral sites of a spinel. We revealed that the crystal symmetry was reduced from a cubic, giving rise to extra superlattice reflections along the c* axis and this showed good agreement with a tetragonal structure with c ≲ 3a. We succeeded in determining the position of vacancy sites as well as the unit cell by comparing the XRD results with calculated reflection patterns for plausible vacancy ordered models. The temperature dependent resistivity of the vacancy ordered γ-Fe₂O₃ was several orders higher than that of Fe₃O₄.

Original language	English
Article number	054708
Journal	Journal of the Physical Society of Japan
Volume	75
Issue number	5
DOIs	https://doi.org/10.1143/JPSJ.75.054708
Publication status	Published - 2006 May

Keywords

γ-FeO
Maghemite
Ozone beam
Resistivity
Vacancy ordering

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title = "Iron vacancy ordered γ-Fe2O3(001) epitaxial films: The crystal structure and electrical resistivity",

abstract = "We report the structural characterization and transport properties of highly-ordered epitaxial γ-Fe2O3 thin films grown by a pure ozone-assisted molecular beam epitaxy method. X ray diffraction (XRD) measurements at a synchrotron facility indicated that the composition of films was close to that of γ-Fe2O3 with Fe vacancy only occurring at octahedral sites of a spinel. We revealed that the crystal symmetry was reduced from a cubic, giving rise to extra superlattice reflections along the c* axis and this showed good agreement with a tetragonal structure with c ≲ 3a. We succeeded in determining the position of vacancy sites as well as the unit cell by comparing the XRD results with calculated reflection patterns for plausible vacancy ordered models. The temperature dependent resistivity of the vacancy ordered γ-Fe2O3 was several orders higher than that of Fe3O4.",

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T1 - Iron vacancy ordered γ-Fe2O3(001) epitaxial films

T2 - The crystal structure and electrical resistivity

AU - Yanagihara, Hideto

AU - Hasegawa, Manabu

AU - Kita, Eiji

AU - Wakabayashi, Yusuke

AU - Sawa, Hiroshi

AU - Siratori, Kiiti

PY - 2006/5

Y1 - 2006/5

N2 - We report the structural characterization and transport properties of highly-ordered epitaxial γ-Fe2O3 thin films grown by a pure ozone-assisted molecular beam epitaxy method. X ray diffraction (XRD) measurements at a synchrotron facility indicated that the composition of films was close to that of γ-Fe2O3 with Fe vacancy only occurring at octahedral sites of a spinel. We revealed that the crystal symmetry was reduced from a cubic, giving rise to extra superlattice reflections along the c* axis and this showed good agreement with a tetragonal structure with c ≲ 3a. We succeeded in determining the position of vacancy sites as well as the unit cell by comparing the XRD results with calculated reflection patterns for plausible vacancy ordered models. The temperature dependent resistivity of the vacancy ordered γ-Fe2O3 was several orders higher than that of Fe3O4.

AB - We report the structural characterization and transport properties of highly-ordered epitaxial γ-Fe2O3 thin films grown by a pure ozone-assisted molecular beam epitaxy method. X ray diffraction (XRD) measurements at a synchrotron facility indicated that the composition of films was close to that of γ-Fe2O3 with Fe vacancy only occurring at octahedral sites of a spinel. We revealed that the crystal symmetry was reduced from a cubic, giving rise to extra superlattice reflections along the c* axis and this showed good agreement with a tetragonal structure with c ≲ 3a. We succeeded in determining the position of vacancy sites as well as the unit cell by comparing the XRD results with calculated reflection patterns for plausible vacancy ordered models. The temperature dependent resistivity of the vacancy ordered γ-Fe2O3 was several orders higher than that of Fe3O4.

KW - γ-FeO

KW - Maghemite

KW - Ozone beam

KW - Resistivity

KW - Vacancy ordering

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Iron vacancy ordered γ-Fe₂O₃(001) epitaxial films: The crystal structure and electrical resistivity

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Keywords

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