Nanocrystallite interface effect and exchange bias phenomenology in Cr _2O_3 and NiO nanoparticles

Sabyasachi S.; Majumdar S.; Giri S.

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Nanocrystallite interface effect and exchange bias phenomenology in Cr _2O_3 and NiO nanoparticles

机译：Nanocrystallite interface effect and exchange bias phenomenology in Cr _2O_3 and NiO nanoparticles

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Nanocrystalline Cr_2O_3 and NiO are prepared using high-energy ball milling. Average sizes of the particles obtained from Scanning Electron Microscopy and crystallite sizes obtained from X-ray diffraction are larger for Cr_2O_3 than NiO particles. At low temperature, large high-field magnetization and small coercivity lead to a weak exchange bias for Cr_2O_3, whereas small high-field magnetization and large coercivity lead to a considerable exchange bias for NiO. The training effect is observed for NiO at 4 K which could be described with a recursive formula constructed in the framework of the spin configurational relaxation model. The results suggest that the pinning mechanism at the interface between the antiferromagnetic and the weak ferromagnetic component ascribed to uncompensated spins leads to the exchange bias effect.

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来源
《Solid State Communications》 |2011年第21期|1515-1519|共5页
作者
Sabyasachi S.; Majumdar S.; Giri S.;
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作者单位

Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India;

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原文格式 PDF
正文语种英语
中图分类固体物理学;
关键词
A. Nanocrystalline oxide; B. High energy ball milling; D. Exchange bias; E. Magnetization;

Nanocrystallite interface effect and exchange bias phenomenology in Cr _2O_3 and NiO nanoparticles

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