Effects of nickel doping on the multiferroic and magnetic phases of MnWO4

N. Poudel, B. Lorenz, B. Lv, Y. Q. Wang, F. Ye, Jinchen Wang, J. A. Fernandez-Baca, C. W. Chu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The various orders in multiferroic materials with a frustrated spiral spin modulation inducing a ferroelectric state are extremely sensitive to small perturbations such as magnetic and electric fields, external pressure, or chemical substitutions. A classical multiferroic, the mineral Hübnerite with chemical formula MnWO4, shows three different magnetic phases at low temperature. The intermediate phase between 7.5 K < T < 12.7 K is multiferroic and ferroelectricity is induced by an inversion symmetry breaking spiral Mn-spin order and strong spin-lattice interactions. The substitution of Ni2+ (spin 1) for Mn2+ (spin 5/2) in MnWO4 and its effects on the magnetic and multiferroic phases are studied. The ferroelectric phase is stabilized for low Ni content (up to 10%). Upon further Ni doping, the polarization in the ferroelectric phase is quickly suppressed while a collinear and commensurate magnetic phase, characteristic of the magnetic structure in NiWO4, appears first at higher temperature, gradually extends to lower temperature, and becomes the ground state above 30% doping. Between 10% and 30%, the multiferroic phase coexists with the collinear commensurate phase. In this concentration region, the spin spiral plane is close to the a-b plane which explains the drop of the ferroelectric polarization. The phase diagram of Mn1-xNixWO4 is derived by a combination of magnetic susceptibility, specific heat, electric polarization, and neutron scattering measurements.

Original languageEnglish
Pages (from-to)17-29
Number of pages13
JournalIntegrated Ferroelectrics
Volume166
Issue number1
DOIs
Publication statusPublished - 2015 Oct 13

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Control and Systems Engineering
  • Ceramics and Composites
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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