Static and Dynamic Magnetic Properties of Composite Au-Fe$_{3}$O$_4$Nanoparticles

Fe sub(3)O sub(4) (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 compare...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2007-06, Vol.43 (6), p.3094-3096
Main Authors: Frey, Natalie A., Srinath, Sanyadanam, Srikanth, Hariharan, Wang, Chao, Sun, Shouheng
Format: Article
Language:English
Subjects:
Dynamic mechanical properties
Dynamics
Gold
Magnetic permeability
Magnetic properties
Nanocomposites
Nanostructure
Particulate composites
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Summary:Fe sub(3)O sub(4) (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 Fe sub(3)O sub(4). 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
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2007.893846