Comment on "Magnetic Relaxations of Antiferromagnetic Nanoparticles in Magnetic Fields"
E. del Barco, M. Duran, J. M. Hernandez, and J. Tejada
TL;DR
This study investigates the magnetic relaxation behavior of ferritin nanoparticles at low temperature, confirming faster relaxation without magnetic field and supporting previous observations of quantum tunneling effects.
Contribution
It applies a specific field-cooling method to ferritin to analyze magnetic relaxation, providing new experimental evidence at 5 K.
Findings
Relaxation is faster without magnetic field.
Results agree with previous quantum tunneling observations.
Supports the presence of resonant spin quantum tunneling in ferritin.
Abstract
We have carried out in ferritin the Field-Cooling method and data analysis proposed by Mamiya et al. (Phys. Rev. Lett. 88, 67202 (2002) at T = 5 K in order to check the time magnetic relaxation of these antiferromagnetic nanoparticles as a function of the magnetic field. We found that relaxation at T = 5 K in ferritin is faster in the absence of magnetic field, in good agreement with the zero-field Resonant Spin Quantum Tunneling observed previously in ferritin (Phys. Rev. Lett. 79, 1754 (1997).
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Taxonomy
TopicsProtein Structure and Dynamics · RNA and protein synthesis mechanisms · Nanopore and Nanochannel Transport Studies