Temperature-dependent magnetic measurements are reported for 4.34 nm antiferromagnetic Co3O4 nanoparticles mineralized in the Listeria innocua Dps protein cage. ac measurements show a superparamagnetic blocking temperature of roughly 5.4 K and give an extracted anisotropy energy density of (7.6±0.4)×104J∕m3⁠. The Néel temperature for the Co3O4 nanoparticles, determined with dc magnetometry, was determined to be roughly 15±2K⁠.

Topics
Magnetic properties, Superconducting quantum interference device, Magnetic anisotropy, Magnetic materials, Electromagnetism, Magnetic fields, Transmission electron microscopy, Nanoparticle, Transition metal oxides, Proteins
© 2006 American Institute of Physics.
2006
American Institute of Physics
You do not currently have access to this content.