Magnetic-field-induced spin flop transition and magnetoelectric effect in Ca 2 Fe 2 - X Al x O 5

N. Abe, N. D. Khanh, Takahiko Sasaki, T. Arima

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Magnetic-field-induced spin flop transition and magnetoelectric effect in noncentrosymmetric Ca2Fe2-xAlxO5 (0.5 ≤ x ≤ 1) single crystals have been investigated. Temperature dependence of magnetic susceptibility shows that the compounds have antiferromagnetic transition temperatures TN above room temperature. The spin easy axis varies from the c axis to the a axis with increasing Al content x. When a magnetic field is applied along the spin easy axis, a spin flop transition takes place, accompanied by anomalies in the electric polarization and dielectric constant. The anomalies can be ascribed to a noncollinear spin arrangement in the domain walls between two magnetic phases and/or the spin direction dependent modulation of the metal-ligand hybridization. Such a polarization change with a spin flop transition in polar antiferromagnets may provide a route to realize large magnetoelectric coupling at high temperatures.

Original languageEnglish
Article number054437
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number5
DOIs
Publication statusPublished - 2014 Feb 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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