Journal
SOLID STATE COMMUNICATIONS
Volume 230, Issue -, Pages 11-15Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2016.01.006
Keywords
Exchange bias; Magnetic nanocrystals; Core-shell nanocrystals; Ni/NiO; Exchange anisotropy
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Funding
- Royal Society
- Damascus university
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Ni nanocrystals coated with a thin layer of NiO with a diameter of 5.0 nm show exchange bias induced ferromagnetism at room temperature. These particulates are freely dispersible in water and were obtained by annealing Ni nanoparticles coated with a thin amorphous layer of NiO. Particulates with diameters between 5.0 and 16.8 nm are studied. Detailed magnetic measurements reveal signs consistent with strong exchange bias including elevated blocking temperatures and tangible loop shifts. The structure of the particulates are characterized by high resolution transmission electron microscopy, energy dispersive x-ray analysis and x-ray diffraction. (C) 2016 Elsevier Ltd. All rights reserved.
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