Magnetic enhancement in antiferromagnetic nanoparticle of CoRh2O4

Bhowmik, R. N. ; Nagarajan, R. ; Ranganathan, R. (2004) Magnetic enhancement in antiferromagnetic nanoparticle of CoRh2O4 Physical Review B, 69 (5). 054430_1-054430_5. ISSN 0163-1829

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Our magnetic investigation of CoRh2O4 nanoparticles show the signature of antiferromagnetic ordering at TN≈ 27K, same as that of the bulk sample, for all particle sizes down to ≈16nm. However, we observe a systematic magnetic enhancement below TN, being larger for a smaller particle size. We propose a core-shell model for the magnetization of nanoparticles, with the core retaining its antiferromagnetic order and the enhancement of magnetization below TN attributed to the increasing number of frustrated shell (surface) spins. The scaling analysis of low temperature magnetization shows that the system approaches the limit of superparamagnetism for the particle size ~8nm. Our model also predicts an alternation of exchange interactions along the inter-particle distance, very similar to RKKY type interactions in the metallic spin glass systems.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:24180
Deposited On:29 Nov 2010 10:16
Last Modified:08 Jun 2011 07:17

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