Title :
Magnetic Properties of Heterostructured Co–Au Nanoparticles Direct-Synthesized From Gas Phase
Author :
Xu, Yun-Hao ; Wang, Jian-Ping
Author_Institution :
Dept. of Electr. & Comput. Eng., Minnesota Univ.
fDate :
6/1/2007 12:00:00 AM
Abstract :
Heterostructured Co-Au nanoparticles are direct synthesized from gas phase. Magnetic properties of Co-Au nanoparticles are characterized. Low-temperature and room-temperature hysteresis loops show that the magnetic properties of Co are kept in Co-Au nanoparticles. A blocking temperature of 290 K is measured for Co-Au particles with an average size of 12 nm. A field-cooled low-temperature hysteresis loop of Co-Au nanoparticles indicates the existence of oxide, even the particles have a core-shell-like structure
Keywords :
cobalt; coercive force; ferromagnetic materials; gold; magnetic anisotropy; magnetic hysteresis; magnetic particles; nanoparticles; superparamagnetism; 12 nm; 290 K; CoAu; core-shell-like structure; field-cooled low-temperature hysteresis loop; heterostructured Co-Au nanoparticles; magnetic properties; room-temperature hysteresis loops; Argon; Biomedical optical imaging; Gold; Magnetic cores; Magnetic hysteresis; Magnetic properties; Nanoparticles; Optical films; Size control; Temperature; Cobalt; core-shell; gold; heterostructure; nanocluster; nanoparticle; plasmonic; superparamagnetism;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.894006
