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

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.

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.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE Office of Science - Office of Biological and Environmental Research
OSTI Identifier:
1373099
DOE Contract Number:
AC02-06CH11357
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; epitaxial film; epitaxial strain; ferroic properties; multiferroic; nickel titanate

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_1373099,
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 (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.},
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}
}