Room temperature ferromagnetism in pure Y2O3 nanoparticles
Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University - Lanzhou 730000, PRC
Accepted: 16 November 2011
Room temperature ferromagnetism has been observed in nanoparticles of Y2O3 synthesized by a glycine-nitrate method. By analyzing different annealing conditions and pressing, it is found that the vacuum-heated sample shows the largest ferromagnetism and the annealed pellet sample also exhibits enhanced ferromagnetism. Furthermore, X-ray photoelectron spectroscopy results indicate that the observed ferromagnetism do not involve any impurities and the variation of the relative area of oxygen vacancies is in accord with the change of the saturation magnetization in the samples. Based on these experimental results, the correlation between the ferromagnetism and oxygen defects in Y2O3 nanoparticles is established.
PACS: 75.50.Tt – Fine-particle systems; nanocrystalline materials / 75.50.Dd – Nonmetallic ferromagnetic materials / 75.47.Pq – Other materials
© EPLA, 2012