Size-dependent magnetism and spin-glass behavior of amorphous NiO bulk, clusters, and nanocrystals: Experiments and first-principles calculations

J. B. Yi, J. Ding, Y. P. Feng, G. W. Peng, G. M. Chow, Y. Kawazoe, B. H. Liu, J. H. Yin, and S. Thongmee
Phys. Rev. B 76, 224402 – Published 5 December 2007

Abstract

A combined experimental and computational study was carried out to investigate magnetic properties of NiO nanostructures. Remarkable size-dependent magnetism was discovered. Uniform amorphous NiO showed a dominated antiferromagnetic interaction and an ordering temperature of 3.5K. NiO clusters (up to 1nm) tend to be ferromagnetic interaction with an ordering temperature of 35K, accompanied by high magnetization (105emug) and a spin-glass behavior. NiO nanocrystals (>2nm) were found to be antiferromagnetic with uncompensated surface magnetization and shifted hysteresis due to the core-shell interactions.

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  • Received 26 July 2007

DOI:https://doi.org/10.1103/PhysRevB.76.224402

©2007 American Physical Society

Authors & Affiliations

J. B. Yi1, J. Ding1,*, Y. P. Feng2, G. W. Peng2, G. M. Chow1, Y. Kawazoe3, B. H. Liu1, J. H. Yin1, and S. Thongmee1

  • 1Department of Materials Science and Engineering, National University of Singapore, Singapore 119260
  • 2Department of Physics, National University of Singapore, Singapore 119260
  • 3Institute of Materials Research, Tohoku University, Aoba-ku, Sendai 980-8577, Japan

  • *msedingj@nus.edu.sg

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Vol. 76, Iss. 22 — 1 December 2007

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