Hajra, Partha ; Brahma, Pradip ; Dutta, Saurav ; Banerjee, Sourish ; Chakravorty, Dipankar (2012) Enhancement of magnetic anisotropy in mechanically attrited Cr2O3 nanoparticles Journal of Magnetism and Magnetic Materials, 324 (7). pp. 1425-1430. ISSN 0304-8853
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.jmmm.2011.11.064
Abstract
Cr2O3 nanoparticles of sizes from 24 to 12 nm were synthesized by mechanical grinding. Magnetic hysteresis loops were observed in the temperature range 5–300 K. Zero-field magnetization measurements showed two peaks, at low temperature in the range 36–52 K and at high temperature in the range 255–290 K. They were found to shift to higher temperatures as the particle size was reduced. This was ascribed due to the enhancement of the effective anisotropy constant with a decrease in particle size. The exchange bias was found to increase as the particle size became smaller. This is believed to arise due to an increase in uncompensated spins as a result of large surface area created.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to |
| Keywords: | Magnetic Anisotropy; Exchange Bias |
| ID Code: | 96488 |
| Deposited On: | 21 Dec 2012 10:09 |
| Last Modified: | 21 Dec 2012 10:09 |
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