Effects of annealing temperature on the magnetic properties of highly crystalline biphase iron oxide nanorods
Abstract
We report on the effects of annealing temperatures ranging from 225 °C to 325 °C on the magnetic properties of high aspect ratio iron oxide nanorods consisting of a ferrimagnetic Fe 3 O 4 phase and an antiferromagnetic α-Fe 2 O 3 phase in an as-prepared state. Annealing at the aforementioned temperatures under a constant flow of O 2 for 3 h leads to an increment of the volume fraction of the antiferromagnetic α-Fe 2 O 3 phase and concomitant enhancement of the crystallinity of the ferrimagnetic Fe 3 O 4 phase. These opposing effects compete with each other, resulting in a decrease in global magnetization with increasing the annealing temperature. The desirable magnetic properties are achieved for the sample annealed at 250 °C. For all samples investigated, we observed an increase in low field magnetization at low temperatures after the sample is field cooled in the presence of a 1T magnetic field, which we attribute to the ordering of macro-spins of the weakly ordered antiferromagnetic α-Fe 2 O 3 phase in the presence of the cooling field. Our study will pave the way for determining the optimal conditions to enhance the magnetic characteristics in iron oxide nanorods, which willmore »
- Authors:
-
[1];
[1];
[1]
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
- SEAM Research Centre, South East Technological University, Waterford, Ireland
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1923719
- Grant/Contract Number:
- FG02-07ER46438
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- AIP Advances
- Additional Journal Information:
- Journal Name: AIP Advances Journal Volume: 13 Journal Issue: 2; Journal ID: ISSN 2158-3226
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Attanayake, S. B., Chanda, A., Das, R., Phan, M. H., and Srikanth, H. Effects of annealing temperature on the magnetic properties of highly crystalline biphase iron oxide nanorods. United States: N. p., 2023.
Web. doi:10.1063/9.0000547.
Attanayake, S. B., Chanda, A., Das, R., Phan, M. H., & Srikanth, H. Effects of annealing temperature on the magnetic properties of highly crystalline biphase iron oxide nanorods. United States. https://doi.org/10.1063/9.0000547
Attanayake, S. B., Chanda, A., Das, R., Phan, M. H., and Srikanth, H. Wed .
"Effects of annealing temperature on the magnetic properties of highly crystalline biphase iron oxide nanorods". United States. https://doi.org/10.1063/9.0000547.
@article{osti_1923719,
title = {Effects of annealing temperature on the magnetic properties of highly crystalline biphase iron oxide nanorods},
author = {Attanayake, S. B. and Chanda, A. and Das, R. and Phan, M. H. and Srikanth, H.},
abstractNote = {We report on the effects of annealing temperatures ranging from 225 °C to 325 °C on the magnetic properties of high aspect ratio iron oxide nanorods consisting of a ferrimagnetic Fe 3 O 4 phase and an antiferromagnetic α-Fe 2 O 3 phase in an as-prepared state. Annealing at the aforementioned temperatures under a constant flow of O 2 for 3 h leads to an increment of the volume fraction of the antiferromagnetic α-Fe 2 O 3 phase and concomitant enhancement of the crystallinity of the ferrimagnetic Fe 3 O 4 phase. These opposing effects compete with each other, resulting in a decrease in global magnetization with increasing the annealing temperature. The desirable magnetic properties are achieved for the sample annealed at 250 °C. For all samples investigated, we observed an increase in low field magnetization at low temperatures after the sample is field cooled in the presence of a 1T magnetic field, which we attribute to the ordering of macro-spins of the weakly ordered antiferromagnetic α-Fe 2 O 3 phase in the presence of the cooling field. Our study will pave the way for determining the optimal conditions to enhance the magnetic characteristics in iron oxide nanorods, which will enable its use in spintronics and biomedical applications.},
doi = {10.1063/9.0000547},
journal = {AIP Advances},
number = 2,
volume = 13,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2023},
month = {Wed Feb 01 00:00:00 EST 2023}
}
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