Date of Graduation
2000
Document Type
Thesis
Degree Type
MS
Committee Chair
M. S. Seehra
Abstract
The magnetic properties of nanosized (3-5nm) Si-doped two line ferrihydrites, Six /FeOOH.nH2 O where x = 0, 0.02, 0.05, 0.1, 0.15, 0.20, 0.26, 0.40, 0.50 have been investigated here. The experiments conducted include temperature(5K – 300K) and magnetic field(upto 55 kOe) variations of magnetization under zero field cooled and field cooled conditions. The quantities determined are the magnetic moment per particle mp , the temperature Tp (m) at which magnetization peaks, the spin glass order transition temperature Tg and the hysteresis loop parameters (coercivity Hc , remanence Mr and saturation magnetization Ms (H ® 0)). The dramatic changes observed in the parameters for x > 0.20 leads to the model in which Si replaces the uncompensated surface spins preferentially for initial dopings and for x > 0.20, magnetic dilution of the sites in the antiferromagnetic nanoparticle core starts to occur.
Recommended Citation
Roy, Paromita, "Magnetic properties of silicon-doped ferrihydrite nanoparticles." (2000). Graduate Theses, Dissertations, and Problem Reports. 10454.
https://researchrepository.wvu.edu/etd/10454