Comparative Study of Magnetic Properties of Nanoparticles by High-Frequency Heat Dissipation and Conventional Magnetometry
Abstract
The rate of heating of a water-based colloid of uniformly sized 15 nm magnetic nanoparticles by high-amplitude and high-frequency ac magnetic field induced by the resonating LC circuit (nanoTherics Magnetherm) was measured. The results are analyzed in terms of specific energy absorption rate (SAR). Fitting field amplitude and frequency dependences of SAR to the linear response theory, magnetic moment per particles was extracted. The value of magnetic moment was independently evaluated from dc magnetization measurements (Quantum Design MPMS) of a frozen colloid by fitting field-dependent magnetization to Langevin function. The two methods produced similar results, which are compared to the theoretical expectation for this particle size. Additionally, analysis of SAR curves yielded effective relaxation time.
- Authors:
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1221934
- Report Number(s):
- IS-J-8775
Journal ID: ISSN 1949-307X; TRN: US1500749
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- IEEE Magnetics Letters
- Additional Journal Information:
- Journal Volume: 5; Journal ID: ISSN 1949-307X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY
Citation Formats
Malik, V., Goodwill, J., Mallapragada, S., Prozorov, T., and Prozorov, R. Comparative Study of Magnetic Properties of Nanoparticles by High-Frequency Heat Dissipation and Conventional Magnetometry. United States: N. p., 2014.
Web. doi:10.1109/LMAG.2014.2368517.
Malik, V., Goodwill, J., Mallapragada, S., Prozorov, T., & Prozorov, R. Comparative Study of Magnetic Properties of Nanoparticles by High-Frequency Heat Dissipation and Conventional Magnetometry. United States. https://doi.org/10.1109/LMAG.2014.2368517
Malik, V., Goodwill, J., Mallapragada, S., Prozorov, T., and Prozorov, R. Thu .
"Comparative Study of Magnetic Properties of Nanoparticles by High-Frequency Heat Dissipation and Conventional Magnetometry". United States. https://doi.org/10.1109/LMAG.2014.2368517. https://www.osti.gov/servlets/purl/1221934.
@article{osti_1221934,
title = {Comparative Study of Magnetic Properties of Nanoparticles by High-Frequency Heat Dissipation and Conventional Magnetometry},
author = {Malik, V. and Goodwill, J. and Mallapragada, S. and Prozorov, T. and Prozorov, R.},
abstractNote = {The rate of heating of a water-based colloid of uniformly sized 15 nm magnetic nanoparticles by high-amplitude and high-frequency ac magnetic field induced by the resonating LC circuit (nanoTherics Magnetherm) was measured. The results are analyzed in terms of specific energy absorption rate (SAR). Fitting field amplitude and frequency dependences of SAR to the linear response theory, magnetic moment per particles was extracted. The value of magnetic moment was independently evaluated from dc magnetization measurements (Quantum Design MPMS) of a frozen colloid by fitting field-dependent magnetization to Langevin function. The two methods produced similar results, which are compared to the theoretical expectation for this particle size. Additionally, analysis of SAR curves yielded effective relaxation time.},
doi = {10.1109/LMAG.2014.2368517},
journal = {IEEE Magnetics Letters},
number = ,
volume = 5,
place = {United States},
year = {Thu Nov 13 00:00:00 EST 2014},
month = {Thu Nov 13 00:00:00 EST 2014}
}
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