Magnetic properties of superparamagnetic, nanocrystalline cobalt ferrite thin films deposited at low temperature
Abstract
Bulk cobalt ferrite, being a hard ferrite, shows high magnetization, high resistivity and high coercivity. If thin films of cobalt ferrite can be deposited at a low enough temperature and if its coercivity can be reduced, cobalt ferrite will make a very good candidate for use as a magnetic core of an integrated inductor in RF-CMOS ICs. Though polycrystalline and epitaxial thin films of cobalt ferrite have been made by various techniques, there are no reports of thin films of superparamagnetic cobalt ferrite. In this work, nanocrystalline cobalt ferrite thin films, which are superparamagnetic as deposited, have been prepared in the solution medium at ~190 °C, using microwave irradiation. The as-prepared films have a saturation magnetization (MS) of 401 emu/cc and coercivity (HC) of 19 Oe at room temperature for a crystallite size of 2 nm. The cobalt ferrite powder obtained as a by-product during the same process has MS of 50 emu/g and HC of 5 Oe at room temperature, making it superparamagnetic. The as-prepared films were annealed in air at 300 °C for 5 min and 10 min. Annealing for 10 min results in an increase in crystallite size to 36 nm, MS increases from 401 emu/cc tomore »
- Authors:
-
[2];
- Indian Inst. of Science, Bengaluru (India)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1560488
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Magnetism and Magnetic Materials
- Additional Journal Information:
- Journal Volume: 465; Journal Issue: C; Journal ID: ISSN 0304-8853
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; Cobalt ferrite; Ferrite thin films; Magnetic materials; Superparamagnetism
Citation Formats
Sangeneni, Neelima, Taddei, Keith M., Bhat, Navakanta, and Shivashankar, Sa. Magnetic properties of superparamagnetic, nanocrystalline cobalt ferrite thin films deposited at low temperature. United States: N. p., 2018.
Web. doi:10.1016/j.jmmm.2018.06.038.
Sangeneni, Neelima, Taddei, Keith M., Bhat, Navakanta, & Shivashankar, Sa. Magnetic properties of superparamagnetic, nanocrystalline cobalt ferrite thin films deposited at low temperature. United States. https://doi.org/10.1016/j.jmmm.2018.06.038
Sangeneni, Neelima, Taddei, Keith M., Bhat, Navakanta, and Shivashankar, Sa. Thu .
"Magnetic properties of superparamagnetic, nanocrystalline cobalt ferrite thin films deposited at low temperature". United States. https://doi.org/10.1016/j.jmmm.2018.06.038. https://www.osti.gov/servlets/purl/1560488.
@article{osti_1560488,
title = {Magnetic properties of superparamagnetic, nanocrystalline cobalt ferrite thin films deposited at low temperature},
author = {Sangeneni, Neelima and Taddei, Keith M. and Bhat, Navakanta and Shivashankar, Sa},
abstractNote = {Bulk cobalt ferrite, being a hard ferrite, shows high magnetization, high resistivity and high coercivity. If thin films of cobalt ferrite can be deposited at a low enough temperature and if its coercivity can be reduced, cobalt ferrite will make a very good candidate for use as a magnetic core of an integrated inductor in RF-CMOS ICs. Though polycrystalline and epitaxial thin films of cobalt ferrite have been made by various techniques, there are no reports of thin films of superparamagnetic cobalt ferrite. In this work, nanocrystalline cobalt ferrite thin films, which are superparamagnetic as deposited, have been prepared in the solution medium at ~190 °C, using microwave irradiation. The as-prepared films have a saturation magnetization (MS) of 401 emu/cc and coercivity (HC) of 19 Oe at room temperature for a crystallite size of 2 nm. The cobalt ferrite powder obtained as a by-product during the same process has MS of 50 emu/g and HC of 5 Oe at room temperature, making it superparamagnetic. The as-prepared films were annealed in air at 300 °C for 5 min and 10 min. Annealing for 10 min results in an increase in crystallite size to 36 nm, MS increases from 401 emu/cc to 545 emu/cc, and HC increases from 19 Oe to 860 Oe. In conclusion, the change in magnetic properties can be directly associated with change in the crystallite size and degree of crystallographic inversion, as determined by neutron diffraction and deduced from X-ray photoelectron spectroscopy.},
doi = {10.1016/j.jmmm.2018.06.038},
journal = {Journal of Magnetism and Magnetic Materials},
number = C,
volume = 465,
place = {United States},
year = {Thu Jun 14 00:00:00 EDT 2018},
month = {Thu Jun 14 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
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journal, September 2019
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