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Title: Room–Temperature Insulating Ferromagnetic (Ni,Co)1+2xTi1–xO3 Thin Films

Abstract

Insulating uniaxial room–temperature ferromagnets are a prerequisite for commonplace spin wave–based devices, the obstacle in contemporary ferromagnets being the coupling of ferromagnetism with large conductivity. It is shown that the uniaxial A1 + 2xTi4+1 – xO3 (ATO), A = Ni2+,Co2+, and 0.6 < x ≤ 1, thin films are electrically insulating ferromagnets already at room temperature. Here, the octahedra network of the ATO and the corundum and ilmenite structures are the same yet different octahedra–filling proved to be a route to switch from the antiferromagnetic to ferromagnetic regime. Octahedra can continuously be filled up to x = 1, or vacated (–0.24 < x < 0) in the ATO structure. TiO–layers, which separate the ferromagnetic (Ni,Co)O–layers and intermediate the antiferromagnetic coupling between the ferromagnetic layers in the NiTiO3 and CoTiO3 ilmenites, can continuously be replaced by (Ni,Co)O–layers to convert the ATO–films to ferromagnetic insulator with abundant direct cation interactions.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [2]
  1. Finnish Research and Engineering, Jaalaranta Helsinki (Finland)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Martin-Luther-Univ. Halle-Wittenberg, Halle (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1571845
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Annalen der Physik (Leipzig)
Additional Journal Information:
Journal Name: Annalen der Physik (Leipzig); Journal Volume: 531; Journal Issue: 11; Journal ID: ISSN 0003-3804
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; corundum compounds; ilmenites; insulating ferromagnet; nickel cobalt titanates; thin films

Citation Formats

Fujioka, Yukari, Frantti, Johannes, Rouleau, Christopher M., Puretzky, Alexander A., Gai, Zheng, Lavrik, Nickolay V., Herklotz, Andreas, Ivanov, Ilia N., and Meyer, III, Harry. Room–Temperature Insulating Ferromagnetic (Ni,Co)1+2xTi1–xO3 Thin Films. United States: N. p., 2019. Web. doi:10.1002/andp.201900299.
Fujioka, Yukari, Frantti, Johannes, Rouleau, Christopher M., Puretzky, Alexander A., Gai, Zheng, Lavrik, Nickolay V., Herklotz, Andreas, Ivanov, Ilia N., & Meyer, III, Harry. Room–Temperature Insulating Ferromagnetic (Ni,Co)1+2xTi1–xO3 Thin Films. United States. doi:10.1002/andp.201900299.
Fujioka, Yukari, Frantti, Johannes, Rouleau, Christopher M., Puretzky, Alexander A., Gai, Zheng, Lavrik, Nickolay V., Herklotz, Andreas, Ivanov, Ilia N., and Meyer, III, Harry. Mon . "Room–Temperature Insulating Ferromagnetic (Ni,Co)1+2xTi1–xO3 Thin Films". United States. doi:10.1002/andp.201900299. https://www.osti.gov/servlets/purl/1571845.
@article{osti_1571845,
title = {Room–Temperature Insulating Ferromagnetic (Ni,Co)1+2xTi1–xO3 Thin Films},
author = {Fujioka, Yukari and Frantti, Johannes and Rouleau, Christopher M. and Puretzky, Alexander A. and Gai, Zheng and Lavrik, Nickolay V. and Herklotz, Andreas and Ivanov, Ilia N. and Meyer, III, Harry},
abstractNote = {Insulating uniaxial room–temperature ferromagnets are a prerequisite for commonplace spin wave–based devices, the obstacle in contemporary ferromagnets being the coupling of ferromagnetism with large conductivity. It is shown that the uniaxial A1 + 2xTi4+1 – xO3 (ATO), A = Ni2+,Co2+, and 0.6 < x ≤ 1, thin films are electrically insulating ferromagnets already at room temperature. Here, the octahedra network of the ATO and the corundum and ilmenite structures are the same yet different octahedra–filling proved to be a route to switch from the antiferromagnetic to ferromagnetic regime. Octahedra can continuously be filled up to x = 1, or vacated (–0.24 < x < 0) in the ATO structure. TiO–layers, which separate the ferromagnetic (Ni,Co)O–layers and intermediate the antiferromagnetic coupling between the ferromagnetic layers in the NiTiO3 and CoTiO3 ilmenites, can continuously be replaced by (Ni,Co)O–layers to convert the ATO–films to ferromagnetic insulator with abundant direct cation interactions.},
doi = {10.1002/andp.201900299},
journal = {Annalen der Physik (Leipzig)},
number = 11,
volume = 531,
place = {United States},
year = {2019},
month = {9}
}

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