DocumentCode :
858872
Title :
Static and Dynamic Magnetic Properties of Composite Au-Fe 
O 
Nanoparticles
Author :
Frey, Natalie A. ; Srinath, Sanyadanam ; Srikanth, Hariharan ; Wang, Chao ; Sun, Shouheng
Author_Institution :
Dept. of Phys., Univ. of South Florida, Tampa, FL
Volume :
43
Issue :
6
fYear :
2007
fDate :
6/1/2007 12:00:00 AM
Firstpage :
3094
Lastpage :
3096
Abstract :
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 dc magnetization 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
Keywords :
exchange interactions (electron); gold; iron compounds; magnetic anisotropy; magnetic hysteresis; magnetic particles; magnetic susceptibility; nanoparticles; particle reinforced composites; 8 nm; 9 nm; Au-Fe3O4; RF transverse susceptibility; composite Au-Fe3O4 nanoparticles; dc magnetization; dumbbell-like structure; dynamic magnetic properties; exchange bias; flower-like structure; magnetic anisotropy; static magnetic properties; Gold; Iron; Magnetic anisotropy; Magnetic properties; Magnetic susceptibility; Magnetization; Nanostructures; Perpendicular magnetic anisotropy; Radio frequency; Temperature; Exchange bias; magnetic anisotropy; magnetic nanoparticles; transverse susceptibility;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2007.893846
Filename :
4202720
Link To Document :
