Hajra, P. ; Basu, S. ; Dutta, S. ; Brahma, P. ; Chakravorty, D. (2009) Exchange bias in ferrimagnetic-antiferromagnetic nanocomposite produced by mechanical attrition Journal of Magnetism and Magnetic Materials, 321 (14). pp. 2269-2275. ISSN 0304-8853
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S03048...
Related URL: http://dx.doi.org/10.1016/j.jmmm.2009.01.037
Abstract
Nanoparticles comprising of magnetite (Fe3O4) core-hematite (α-Fe2O3) shell with mean diameter around 9 nm were synthesized by mechanical grinding. Zero-field-cooled (ZFC) and field-cooled (FC) magnetization and hysteresis loop measurements were carried out over the temperature range 5-300 K. Exchange bias varying from 140 to 10 Oe was observed. This is explained as arising due to ferrimagnetic-antiferromagnetic coupling at the nanointerfaces between the two phases. Analysis of data shows a pronounced increase in the effective anisotropy constant as the milling time is increased.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Core-shell; Nanocomposite; Exchange Bias; Mechanical Attrition |
| ID Code: | 7412 |
| Deposited On: | 25 Oct 2010 11:38 |
| Last Modified: | 28 May 2011 04:28 |
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