Kumar, Nitesh ; Sanyal, D. ; Sundaresan, A. (2009) Defect induced ferromagnetism in MgO nanoparticles studied by optical and positron annihilation spectroscopy Chemical Physics Letters, 477 (4-6). pp. 360-364. ISSN 0009-2614
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Official URL: http://doi.org/10.1016/j.cplett.2009.07.037
Related URL: http://dx.doi.org/10.1016/j.cplett.2009.07.037
Abstract
Positron annihilation spectroscopy has been used to explore the nature of defects and to estimate the defect concentrations in ferromagnetic MgO nanoparticles. Our experimental results show that Mg vacancies or Mg vacancy concentration are present approximately at the concentration of 3.4 × 1016 cm−3 in the nano-crystalline MgO which is twice the value that obtained for bulk sample. This is in correlation with the decrease of the intensity of blue luminescence and the saturation magnetic moment with increasing particle size. These results clearly demonstrate that the origin of magnetic moment and thus the ferromagnetism in MgO nanoparticles is due to Mg related vacancies at the surface of the particles.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
ID Code: | 120084 |
Deposited On: | 22 Jun 2021 07:48 |
Last Modified: | 22 Jun 2021 07:48 |
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