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)×104Jm3. The Néel temperature for the Co3O4 nanoparticles, determined with dc magnetometry, was determined to be roughly 15±2K.

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