Magnetic-field-induced spin flop transition and magnetoelectric effect in Ca2Fe2xAlxO5

N. Abe, N. D. Khanh, T. Sasaki, and T. Arima
Phys. Rev. B 89, 054437 – Published 28 February 2014

Abstract

Magnetic-field-induced spin flop transition and magnetoelectric effect in noncentrosymmetric Ca2Fe2xAlxO5 (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.

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  • Received 29 August 2013
  • Revised 14 February 2014

DOI:https://doi.org/10.1103/PhysRevB.89.054437

©2014 American Physical Society

Authors & Affiliations

N. Abe1, N. D. Khanh2, T. Sasaki3, and T. Arima1

  • 1Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
  • 2Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 3Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

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Issue

Vol. 89, Iss. 5 — 1 February 2014

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