Physics of the Solid State

, Volume 51, Issue 5, pp 953–960 | Cite as

Anomalous magnetic properties of electron-irradiated antiferromagnetic copper monoxide

  • T. I. Arbuzova
  • S. V. Naumov
  • V. L. Arbuzov
  • A. P. Druzhkov
Magnetism and Ferroelectricity

Abstract

The influence of radiation defects on the magnetic properties of polycrystalline CuO and a high density nanoceramic with crystallite sizes d = 5 and 15 nm has been studied in the temperature range T = 77–300 K. Electron irradiation at fluences Φ = 5 × 1018 cm−2 initiated an increase in the susceptibility χ ∼ 1/T below 150 K, a feature anomalous for 3D antiferromagnets. The nonlinear behavior of magnetization in weak fields, the increase in the magnetic moment with decreasing temperature, and observation of the spontaneous magnetic moment at temperatures T < 150 K can be attributed to local changes in the exchange parameters and the formation of clusters with uncompensated magnetic moments in the antiferromagnetic matrix near point defects.

PACS numbers

61.80.-x 75.50.Ee 75.75.+a 75.30.Et 

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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • T. I. Arbuzova
    • 1
  • S. V. Naumov
    • 1
  • V. L. Arbuzov
    • 1
  • A. P. Druzhkov
    • 1
  1. 1.Institute of Metal Physics, Ural DivisionRussian Academy of SciencesYekaterinburgRussia

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