Very high field magnetization and AC susceptibility of native horse spleen ferritin |
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| Authors: | RP Guertin N Harrison ZX Zhou S McCall F Drymiotis |
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| Institution: | 1. Department of Physics and Astronomy, Room 201, Science and Technology Center, Tufts University, Medford, MA 02155, USA;2. National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;3. MS6056, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA;4. Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94551, USA;5. Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA |
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| 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 Fe3+ 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 Fe3+ in the ferritin molecule. The AC magnetic susceptibility, χAC(T,f), responding to the uncompensated spins, reaches a maximum near the superparamagnetic blocking temperature with the temperature of the maximum, TM, varying with excitation frequency, TM−1 α log f for 10?f?104 Hz. |
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| Keywords: | 75 75 +a 75 20 &minus g 75 50 Ee 75 60 Ej 75 50 &minus y 87 15 &minus v |
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