Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO3 Thin Films

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Tamas Varga
  • Timothy C. Droubay
  • Libor Kovarik
  • Manjula I. Nandasiri
  • Vaithiyalingam Shutthanandan
  • Dehong Hu
  • Bumsoo Kim
  • Seungbum Hong
  • Yulan Li
  • Scott A. Chambers

Detail(s)

Original languageEnglish
Pages (from-to)21879-21890
Journal / PublicationACS Applied Materials and Interfaces
Volume9
Issue number26
Online published9 Jun 2017
Publication statusPublished - 5 Jul 2017
Externally publishedYes

Abstract

Polarization-induced weak ferromagnetism (WFM) was demonstrated a few years back in LiNbO3-type compounds, MTiO3 (M = Fe, Mn, Ni). Although the coexistence of ferroelectric polarization and ferromagnetism has been demonstrated in this rare multiferroic family before, first in bulk FeTiO3, then in thin-film NiTiO3, the coupling of the two order parameters has not been confirmed. Here, we report the stabilization of polar, ferromagnetic NiTiO3 by oxide epitaxy on a LiNbO3 substrate utilizing tensile strain and demonstrate the theoretically predicted coupling between its polarization and ferromagnetism by X-ray magnetic circular dichroism under applied fields. The experimentally observed direction of ferroic ordering in the film is supported by simulations using the phase-field approach. Our work validates symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and WFM in MTiO3 transition metal titanates crystallizing in the LiNbO3 structure. It also demonstrates the applicability of epitaxial strain as a viable alternative to high-pressure crystal growth to stabilize metastable materials and a valuable tuning parameter to simultaneously control two ferroic order parameters to create a multiferroic. Multiferroic NiTiO3 has potential applications in spintronics where ferroic switching is used, such as new four-stage memories and electromagnetic switches.

Research Area(s)

  • epitaxial film, epitaxial strain, ferroic properties, multiferroic, nickel titanate

Citation Format(s)

Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO3 Thin Films. / Varga, Tamas; Droubay, Timothy C.; Kovarik, Libor; Nandasiri, Manjula I.; Shutthanandan, Vaithiyalingam; Hu, Dehong; Kim, Bumsoo; Jeon, Seokwoo; Hong, Seungbum; Li, Yulan; Chambers, Scott A.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 26, 05.07.2017, p. 21879-21890.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review