Magnetization enhancement in magnetite nanoparticles capped with alginic acid

被引：43

作者：

Andrzejewski, Bartlomiej ^{[1
]}

Bednarski, Waldemar ^{[1
]}

Kazmierczak, Malgorzata ^{[1
,2
]}

Lapinski, Andrzej ^{[1
]}

Pogorzelec-Glaser, Katarzyna ^{[1
]}

Hilczer, Bozena ^{[1
]}

Jurga, Stefan ^{[2
]}

Nowaczyk, Grzegorz ^{[2
]}

Zaleski, Karol ^{[2
]}

Matczak, Michal ^{[1
,2
]}

Leska, Boguslawa ^{[3
]}

Pankiewicz, Radoslaw ^{[3
]}

Kepinski, Leszek ^{[4
]}

机构：

[1] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland

[2] Adam Mickiewicz Univ, NanoBioMed Ctr, PL-61614 Poznan, Poland

[3] Adam Mickiewicz Univ, Fac Chem, PL-61614 Poznan, Poland

[4] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50422 Wroclaw, Poland

来源：

COMPOSITES PART B-ENGINEERING | 2014年 / 64卷

关键词：

Nano-structures; Magnetic properties; Electron microscopy; Powder processing; FERROMAGNETIC-RESONANCE;

D O I：

10.1016/j.compositesb.2014.04.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：147 / 154

页数：8

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