Control of magnetic interaction and ferroelectricity by nonmagnetic Ga substitution in multiferroic YMn2O5

H. Kimura, Y. Sakamoto, M. Fukunaga, H. Hiraka, Y. Noda

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have studied the effects of substituting nonmagnetic Ga3+ for Mn3+ on dielectric and magnetic properties in multiferroic YMn 2O5. Upon Ga substitution, whereby only the Mn3 + ions are selectively replaced, the commensurate magnetic phase eventually disappeared owing to the disconnection of the magnetic interaction between Mn3+ and Mn4+ ions. In contrast, the low-temperature incommensurate magnetic phase is hardly affected by Ga substitution. Precise crystal structure analyses of Ga-substituted YMn 2O5 have revealed that the bonds between Mn ions along the ab plane changed markedly with increasing Ga concentration, while those along the c axis did not change at all. This indicates that the magnetic interactions along the ab plane were altered dramatically, while those along the c axis were robust against Ga substitution. From the dielectric and magnetic phase diagrams as a function of Ga substitution, we conclude that the electric polarization is predominantly induced by exchange-striction in the commensurate magnetic phase, and by an inverse Dzyaloshinskii-Moriya interaction in the incommensurate phase.

Original languageEnglish
Article number104414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number10
DOIs
Publication statusPublished - Mar 29 2013

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Ferroelectricity
ferroelectricity
Substitution reactions
substitutes
Ions
interactions
ions
Dielectric properties
Phase diagrams
dielectric properties
Magnetic properties
Crystal structure
phase diagrams
Polarization
magnetic properties
crystal structure
polarization
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Control of magnetic interaction and ferroelectricity by nonmagnetic Ga substitution in multiferroic YMn2O5 . / Kimura, H.; Sakamoto, Y.; Fukunaga, M.; Hiraka, H.; Noda, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 10, 104414, 29.03.2013.

Research output: Contribution to journalArticle

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