Static and dynamic magnetic properties of composite Au-Fe3O4 nanoparticles

被引：15

作者：

Frey, Natalie A. ^{[1
]}

Srinath, Sanyadanam

Srikanth, Hariharan

Wang, Chao

Sun, Shouheng

机构：

[1] Univ S Florida, Dept Phys, Tampa, FL 33647 USA

[2] Univ Hyderabad, Sch Phys, Hyderabad 500046, Andhra Pradesh, India

[3] Brown Univ, Dept Chem, Providence, RI 02912 USA

[4] Brown Univ, Div Engn, Providence, RI 02912 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2007年 / 43卷 / 06期

关键词：

exchange bias; magnetic anisotropy; magnetic nanoparticles; transverse susceptibility;

D O I：

10.1109/TMAG.2007.893846

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Fe3O4 (9 nm) grown epitaxially on one or several facets of a seed Au particle (8 nm) leads to two distinct composite nanoparticle structures dubbed "dumbbell-" and "flower-like." These particles exhibit novel magnetic behavior such as large magnetic anisotropy compared to the single component Fe3O4 . We have studied the static and dynamic magnetic properties using temperature and field-dependent demagnetization and RF transverse susceptibility. While the magnetic properties of dumbbell-like particles are relatively conventional, field-cooled M-H loops of flower-shaped particles as well as the transverse susceptibility show large shifts along the field axis indicative of exchange bias.

引用

页码：3094 / 3096

页数：3

共 9 条

[1] SURFACE EFFECTS IN METALLIC IRON NANOPARTICLES [J].