Title :
Superparamagnetic behaviour of antiferromagnetic CuO nanoparticles
Author :
Rao, G. Narrsinga ; Yao, Y.D. ; Chen, J.Y.
Author_Institution :
Inst. of Phys., Acad. Sinica, Taipei, Taiwan
Abstract :
The magnetic properties of CuO nanoparticles prepared by calcining are investigated. Above the so-called blocking temperature, it is observed that the thermal energy became larger than the anisotropy energy of Cu2+ moments indicating a superparamagnetic behaviour on the magnetization of CuO nanoparticles. Furthermore, the M-H data exhibit features of superparamagnetic particles, such as symmetrical hysteresis loops with a coercive field of 200 Oe and a remanence 0.00385 emu/g at 5 K.
Keywords :
antiferromagnetic materials; calcination; coercive force; copper compounds; magnetic anisotropy; magnetic hysteresis; magnetic moments; magnetic particles; nanoparticles; remanence; superparamagnetism; weak ferromagnetism; 5 K; CuO; M-H data; anisotropy energy; antiferromagnetic nanoparticles; blocking temperature; calcining; coercive field; magnetization; moments; remanence; superparamagnetic behavior; symmetrical hysteresis loops; thermal energy; Antiferromagnetic materials; Copper; Magnetic field measurement; Magnetic hysteresis; Magnetic moments; Magnetic properties; Magnetization; Nanoparticles; Physics; Temperature dependence;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1463954
