Abstract
The magnetization of native horse spleen ferritin protein is measured in pulsed magnetic fields to 55 T at T=1.52 K. The magnetization rises smoothly with negative curvature due to uncompensated Fe 3+ spins and with a large high field slope due to the underlying antiferromagnetic ferritin core. Even at highest fields the magnetic moment is only ∼4% of the saturation moment of the full complement of Fe 3+ in the ferritin molecule. The AC magnetic susceptibility, χ AC( T, f), responding to the uncompensated spins, reaches a maximum near the superparamagnetic blocking temperature with the temperature of the maximum, T M, varying with excitation frequency, T M −1 α log f for 10⩽ f⩽10 4 Hz.
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