Highly crystalline superparamagnetic iron oxide nanoparticles (SPION) in a silica matrix

Effect of 1D Ordering on Magnetic Properties of Iron Nanoparticles coated by Silica Shell

“…However, even at 300 K the decrease of coercivity to zero value was not observed. This result is in contradiction with expectance of superparamagnetic state typical of iron based nanoparticles with similar size [11]. These unusual properties could by explain as a consequence of very strong magnetic interactions leading to superferromagnetism in studied system.…”

The study of magnetic properties and relaxation processes in Co/Au bimetallic nanoparticles

“…3. According to numerous authors [5,6,13] such behavior of the ac susceptibility components is typical of systems in which blocking or freezing of magnetic moments occurs.…”

“…De Toro et al [11,12] observed the ideal superspin glass behavior in the ensemble of uniform 8 nm maghemite nanoparticles after they had been pressed into the disc. On the other hand, Tadic et al [13] presented non-compressed maghemite nanoparticles (4 nm) which exhibited superparamagnetic properties. These results are in accordance with the finding of Jimenez-Villacorta et al [8] who were investigating the concentration effect on magnetic characteristics of the fine Fe nanoparticles embedded in non-magnetic matrix.…”

Structural and Magnetic Properties of Microwave Assisted Sol-Gel Synthesized La0.9Sr0.1MnO3Eshraghi1, Kameli2 2014ISRN Nanotechnology2010View full textAdd to dashboardCite

“…There are several models to interpret the ac susceptibility behavior of the magnetic nanoparticles. In the noninteracting SPM system, the frequency dependence of blocking temperature follows the Néel-Brown model [23]:…”