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Title: Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO 3 Thin Films

Abstract

Polarization-induced weak ferromagnetism has been predicted recently in LiNbO3-type MTiO3 (M = Fe, Mn, Ni). While coexisting ferroelectric polarization and ferromagnetism have been demonstrated in this 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 LiNbO3 substrate utilizing tensile strain, and demonstrate the theory-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 simulation using phase-field approach. Our work validates symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and weak ferromagnetism 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.

Authors:
ORCiD logo; ; ;  [1]; ; ORCiD logo;  [2]; ORCiD logo [3];  [2]; ;
  1. Imaging and Chemical Analysis Laboratory, Montana State University, Bozeman, Montana 59717, United States
  2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States; Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
  3. Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1372003
Report Number(s):
PNNL-SA-121771
Journal ID: ISSN 1944-8244; 48108; 48647; KP1704020
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Applied Materials and Interfaces; Journal Volume: 9; Journal Issue: 26
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Environmental Molecular Sciences Laboratory

Citation Formats

Varga, Tamas, Droubay, Timothy C., Kovarik, Libor, Nandasiri, Manjula I., Shutthanandan, Vaithiyalingam, Hu, Dehong, Kim, Bumsoo, Jeon, Seokwoo, Hong, Seungbum, Li, Yulan, and Chambers, Scott A. Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO 3 Thin Films. United States: N. p., 2017. Web. doi:10.1021/acsami.7b04481.
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. Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO 3 Thin Films. United States. doi:10.1021/acsami.7b04481.
Varga, Tamas, Droubay, Timothy C., Kovarik, Libor, Nandasiri, Manjula I., Shutthanandan, Vaithiyalingam, Hu, Dehong, Kim, Bumsoo, Jeon, Seokwoo, Hong, Seungbum, Li, Yulan, and Chambers, Scott A. Thu . "Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO 3 Thin Films". United States. doi:10.1021/acsami.7b04481.
@article{osti_1372003,
title = {Coupled Lattice Polarization and Ferromagnetism in Multiferroic NiTiO 3 Thin Films},
author = {Varga, Tamas and Droubay, Timothy C. and Kovarik, Libor and Nandasiri, Manjula I. and Shutthanandan, Vaithiyalingam and Hu, Dehong and Kim, Bumsoo and Jeon, Seokwoo and Hong, Seungbum and Li, Yulan and Chambers, Scott A.},
abstractNote = {Polarization-induced weak ferromagnetism has been predicted recently in LiNbO3-type MTiO3 (M = Fe, Mn, Ni). While coexisting ferroelectric polarization and ferromagnetism have been demonstrated in this 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 LiNbO3 substrate utilizing tensile strain, and demonstrate the theory-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 simulation using phase-field approach. Our work validates symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and weak ferromagnetism 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.},
doi = {10.1021/acsami.7b04481},
journal = {ACS Applied Materials and Interfaces},
number = 26,
volume = 9,
place = {United States},
year = {Thu Jun 22 00:00:00 EDT 2017},
month = {Thu Jun 22 00:00:00 EDT 2017}
}