Temperature-dependent magnetic measurements are reported for 4.34 nm antiferromagnetic 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 . The Néel temperature for the nanoparticles, determined with dc magnetometry, was determined to be roughly .
© 2006 American Institute of Physics.
2006
American Institute of Physics
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