Excess Spin and the Dynamics of Antiferromagnetic Ferritin
J. G. E. Harris, J. E. Grimaldi, D. D. Awschalom, A. Chiolero, D. Loss
TL;DR
This study investigates the magnetic properties of synthetic ferritin proteins with varying iron content, revealing how excess magnetic moments scale with size and aligning with theories of quantum coherence in antiferromagnetic particles.
Contribution
It provides experimental data on the size-dependent excess magnetic moment in ferritin, supporting models of finite size effects and sublattice noncompensation in antiferromagnetic particles.
Findings
Excess magnetic moment scales with protein size.
Results align with theories of macroscopic quantum coherence.
Supports finite size and sublattice noncompensation models.
Abstract
Temperature-dependent magnetization measurements on a series of synthetic ferritin proteins containing from 100 to 3000 Fe(III) ions are used to determine the uncompensated moment of these antiferromagnetic particles. The results are compared with recent theories of macroscopic quantum coherence which explicitly include the effect of this excess moment. The scaling of the excess moment with protein size is consistent with a simple model of finite size effects and sublattice noncompensation.
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