Magnetodielectric coupling in MnCr2O4 spinel

N. Mufti, G. R. Blake, T. T. M. Palstra*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We have investigated the magnetic and dielectric properties of polycrystalline samples of the spinel MnCr2O4. Below the ferrimagnetic ordering temperature at T-N similar to 43 K, both magnetization and dielectric measurements show signatures of the onset of a conical structure at T-s similar to 17 K and a lock-in temperature at T-f similar to 14 K. These values are similar to those previously reported for single-crystal samples, where the spiral structure is short-range ordered (SRO) at low temperatures. The application of magnetic field suppresses the dielectric anomaly at T-f indicating that the coherence length of the ordering increases. MnCr2O4 exhibits a symmetrical magnetodielectric response between T-f and T-s that scales with the square of the magnetization. This suggests that the magnetodielectric coupling originates from the (PM2)-M-2 term in the free energy expansion. The magnetodielectric response becomes asymmetric with respect to field below T-f. (C) 2009 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)1767-1769
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number11
DOIs
Publication statusPublished - Jun-2009
EventSymposium on Multiferroics and Magnetoelectrics Materials held at the 2008 EMRS Spring Conference - , France
Duration: 26-May-200830-May-2008

Keywords

  • Magnetoelectric
  • Multiferroic
  • Spinel
  • FERROELECTRIC POLARIZATION
  • REVERSAL

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