Phys. Rev. Lett. 88, 067202 (2002) [4 pages]Magnetic Relaxations of Antiferromagnetic Nanoparticles in Magnetic FieldsReceived 15 October 2001; published 28 January 2002 We reexamine anomalous magnetic relaxations of ferritin in magnetic fields, the presence of which has been regarded as evidence suggesting the existence of thermally assisted macroscopic quantum tunneling in antiferromagnetic nanoparticles. In the present study, relaxation curves of ferritin are examined using an approach that is free from assumptions regarding distributions of various parameters of polydispersive particles. The results are not anomalous. In other words, the relaxation is accelerated by the field, as expected for classical superparamagnetic fluctuations. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.067202
DOI:
10.1103/PhysRevLett.88.067202
PACS:
75.50.Tt, 75.60.Jk
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.