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Special Issue "Multiferroics"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (30 November 2010)

Special Issue Editor

Guest Editor
Prof. Dr. Shin-ichi Ohkoshi

Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Special Issue Information

Dear Colleagues,

In recent years, multiferroics has received significant attention in the field of material science. Multiferroics is a material that possesses two- or three- of ferroic properties: ferroelectricity, ferromagnetism, and ferroelasticity. The current trend is to focus on ferroelectric-ferromagnetism. Due to the interaction between the electric polarization and magnetic polarization, coexistence of ferroelectricity and ferromagnetism has the possibility to exhibit the magneto-electric effects, e.g., electric polarization is changed by an external magnetic field, or, magnetic polarization is changed by an external electric field. From the viewpoint of optical properties, a ferroelectric material has nonlinear optical activity, and, hence, a ferroelectric-ferromagnet will show a nonlinear magneto-optical effect such as magnetization-induced second harmonic generation. Magneto-electric effects on multiferroic are expected to produce the future devises. Based on these potentials, the discovery of multiferroic materials is one of the targets in the field of material science, chemistry, and physics. This special issue invites contributions from the fields where novel multiferroic materials contributed to the area of advanced material synthesis, and novel magneto-electric effects contributed to the area of advanced physics and functionalities.

Prof. Dr. Shin-ichi Ohkoshi
Guest Editor

Keywords

  • multiferroics
  • multiferroic material
  • ferroelectric-ferromagnet
  • magneto-electric effect
  • optical magneto-electric effect

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Published Papers (1 paper)

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Research

Open AccessArticle Fabrication of Multiferroic Co-Substituted BiFeO3 Epitaxial Films on SrTiO3 (100) Substrates by Radio Frequency Magnetron Sputtering
Materials 2011, 4(6), 1087-1095; doi:10.3390/ma4061087
Received: 6 May 2011 / Revised: 24 May 2011 / Accepted: 3 June 2011 / Published: 9 June 2011
Cited by 5 | PDF Full-text (1011 KB) | HTML Full-text | XML Full-text
Abstract
The 10 at.% Co-substituted BiFeO3 films (of thickness 50 nm) were successfully prepared by radio frequency (r.f.) magnetron sputtering on SrTiO3 (100) substrates with epitaxial relationships of [001](001)Co-BiFeO3//[001](001)SrTiO3. In this study, a single phase Co-substituted BiFeO3
[...] Read more.
The 10 at.% Co-substituted BiFeO3 films (of thickness 50 nm) were successfully prepared by radio frequency (r.f.) magnetron sputtering on SrTiO3 (100) substrates with epitaxial relationships of [001](001)Co-BiFeO3//[001](001)SrTiO3. In this study, a single phase Co-substituted BiFeO3 epitaxial film was fabricated by r.f. magnetron sputtering. Sputtering conditions such as Ar, O2 gas pressure, annealing temperature, annealing atmosphere, and sputtering power were systematically changed. It was observed that a low Ar gas pressure and low sputtering power is necessary to suppress the formation of the secondary phases of BiOx. The Co-substituted BiFeO3 films were crystalized with post-annealing at 600 °C in air. The process window for single phase films is narrower than that for pure BiFeO3 epitaxial films. By substituting Fe with Co in BiFeO3, the magnetization at room temperature increased to 20 emu/cm3. This result suggests that Co-substituted BiFeO3 films can be used in spin-filter devices. Full article
(This article belongs to the Special Issue Multiferroics)
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