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Title: Synthesis and Magnetic Properties of Nanocrystalline FeTiO{sub 3} Materials

Abstract

Ilmenite (FeTiO{sub 3}) nanoparticles with different size distributions were prepared through a sol-gel auto-ignition method. As-prepared powder is annealed at moderate temperatures to get nanocrystalline FeTiO{sub 3}, and structural, micro-structural, and magnetization characterizations are carried out. Magnetization vs temperature shows antiferromagnetic ordering around 52 K and below 15 K a weak ferromagnetic order develops. The Curie-Weiss law is well obeyed above the Néel temperature (T{sub N}) for all samples. Hysteresis curves show finite coercivity below the peak temperature and none at room temperature. M-H curves for all the samples cooled with a bias magnetic field show exchange bias below T{sub N} which is interpreted due to the finite size and surface effects. The exchange bias is attributed to weak ferromagnetism due to surface spin disorder (Dzyaloshinskii-Moriya interaction) and ferromagnetic interaction (double exchange) due to mixed valence states of Fe ions.

Authors:
 [1];  [2];  [3];  [1]
  1. University of Hyderabad, School of Engineering Sciences & Technology (India)
  2. University of Hyderabad, School of Physics (India)
  3. Mumbai Centre, UGC-DAE Consortium for Scientific Research (India)
Publication Date:
OSTI Identifier:
22776974
Resource Type:
Journal Article
Journal Name:
Journal of Superconductivity and Novel Magnetism
Additional Journal Information:
Journal Volume: 31; Journal Issue: 4; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Article Copyright (c) 2017 Springer Science+Business Media, LLC; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1557-1939
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; ANTIFERROMAGNETISM; COERCIVE FORCE; CRYSTAL STRUCTURE; CURIE-WEISS LAW; FERROMAGNETISM; HYSTERESIS; IGNITION; ILMENITE; INTERACTIONS; IRON IONS; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETIZATION; NANOPARTICLES; NANOSTRUCTURES; SOL-GEL PROCESS; SPIN; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; VALENCE

Citation Formats

Srinivas, P., Kumar, A. Sendil, E-mail: sendilphy@gmail.com, Babu, P. D., and Bhatnagar, Anil K., E-mail: anilb42@gmail.com. Synthesis and Magnetic Properties of Nanocrystalline FeTiO{sub 3} Materials. United States: N. p., 2018. Web. doi:10.1007/S10948-017-4278-Z.
Srinivas, P., Kumar, A. Sendil, E-mail: sendilphy@gmail.com, Babu, P. D., & Bhatnagar, Anil K., E-mail: anilb42@gmail.com. Synthesis and Magnetic Properties of Nanocrystalline FeTiO{sub 3} Materials. United States. doi:10.1007/S10948-017-4278-Z.
Srinivas, P., Kumar, A. Sendil, E-mail: sendilphy@gmail.com, Babu, P. D., and Bhatnagar, Anil K., E-mail: anilb42@gmail.com. Sun . "Synthesis and Magnetic Properties of Nanocrystalline FeTiO{sub 3} Materials". United States. doi:10.1007/S10948-017-4278-Z.
@article{osti_22776974,
title = {Synthesis and Magnetic Properties of Nanocrystalline FeTiO{sub 3} Materials},
author = {Srinivas, P. and Kumar, A. Sendil, E-mail: sendilphy@gmail.com and Babu, P. D. and Bhatnagar, Anil K., E-mail: anilb42@gmail.com},
abstractNote = {Ilmenite (FeTiO{sub 3}) nanoparticles with different size distributions were prepared through a sol-gel auto-ignition method. As-prepared powder is annealed at moderate temperatures to get nanocrystalline FeTiO{sub 3}, and structural, micro-structural, and magnetization characterizations are carried out. Magnetization vs temperature shows antiferromagnetic ordering around 52 K and below 15 K a weak ferromagnetic order develops. The Curie-Weiss law is well obeyed above the Néel temperature (T{sub N}) for all samples. Hysteresis curves show finite coercivity below the peak temperature and none at room temperature. M-H curves for all the samples cooled with a bias magnetic field show exchange bias below T{sub N} which is interpreted due to the finite size and surface effects. The exchange bias is attributed to weak ferromagnetism due to surface spin disorder (Dzyaloshinskii-Moriya interaction) and ferromagnetic interaction (double exchange) due to mixed valence states of Fe ions.},
doi = {10.1007/S10948-017-4278-Z},
journal = {Journal of Superconductivity and Novel Magnetism},
issn = {1557-1939},
number = 4,
volume = 31,
place = {United States},
year = {2018},
month = {4}
}