Synthesis and magnetic properties of Au-coated amorphous Fe20Ni80 nanoparticles

被引：23

作者：

Cushing, BL ^{[1
]}

Golub, V ^{[1
]}

O'Connor, CJ ^{[1
]}

机构：

[1] Univ New Orleans, Coll Sci, Adv Mat Res Inst, New Orleans, LA 70148 USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2004年 / 65卷 / 04期

关键词：

alloys; magnetic properties;

D O I：

10.1016/j.jpcs.2003.11.027

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Gold-coated nanoparticles of Fe20Ni80 (permalloy) have been synthesized by a microemulsion process. The as-prepared samples consist of similar to5 nm diameter particles of amorphous Fe20Ni80 that are likely encapsulated in B2O3. One or more Fe20Ni80@B2O3 particles are subsequently encapsulated in 8-20 nm gold nanospheres, as determined by TEM and X-ray powder diffraction (XRD) line broadening. The gold shells were found to be under expansive strain. Magnetic data confirm the existence of a superparamagnetic phase with a blocking temperature, T-B, of similar to33 K. The saturation magnetization, M-S, of the as-prepared, Au-coated sample is similar to65 emu g(-1) at 5 K and similar to16 emu g(-1) at 300 K. The coercivity, H-C, is similar to280 Oe at 5 K. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：825 / 829

页数：5

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