Authors: Andrzejewski B., Bednarski W., Kaźmierczak M., Łapiński A., Pogorzelec-Glaser K., Hilczer B., Jurga S., Nowaczyk G., Załęski K., Matczak M., Łęska B., Pankiewicz R., Kępiński L.
Title: Magnetization enhancement in magnetite nanoparticles capped with alginic acid
Source: Composites Part B: Engineering
Year : 2014
We report on the effect of alginic acid capping on the behavior of magnetite nanoparticles. The capped nanoparticles exhibit improved crystalline structure of the surface which leads to an enhanced magnetization. The improved structure facilitates quantization of spin-wave spectrum in the finite size nanopartides and this in turn is responsible for unconventional behavior at low temperatures. In electron magnetic resonance these anomalies are manifested as an unusual increase in the resonant field H-r(T) and as a maximum of the spectroscopic splitting g(eff) parameter at low temperatures. This unconventional behavior leads also to pronounced upturn of magnetization at low temperatures and a deviation from the Bloch law M(T) similar to T-3/2. © 2014 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.compositesb.2014.04.022 (Pobrane: 2018-04-04)