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

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5 Author(s)
Frey, Natalie A. ; Dept. of Phys., Univ. of South Florida, Tampa, FL ; Srinath, S. ; Srikanth, Hariharan ; Chao Wang
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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

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 6 )