Magnetodielectric coupling in MnCr2O4 spinel

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

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

22 Citaten (Scopus)
417 Downloads (Pure)

Samenvatting

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.

Originele taal-2English
Pagina's (van-tot)1767-1769
Aantal pagina's3
TijdschriftJournal of Magnetism and Magnetic Materials
Volume321
Nummer van het tijdschrift11
DOI's
StatusPublished - jun-2009
EvenementSymposium on Multiferroics and Magnetoelectrics Materials held at the 2008 EMRS Spring Conference - , France
Duur: 26-mei-200830-mei-2008

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