Apparent magnetic energy-barrier distribution in horse spleen ferritin: Evidence for multiple interacting magnetic entities per ferrihydrite nanoparticle

Tim St Pierre, Nicole Gorham, P.D. Allen, J.L. Costa-Kramer, K.V. Rao

Research output: Contribution to journalArticlepeer-review

7 Citations (Web of Science)

Abstract

Magnetic viscosity measurements were made on native horse-spleen ferritin in zero applied magnetic field at temperatures between 21 and 21 K. The data have been used to calculate the apparent magnetic-moment-weighted energy barrier distribution for the sample of ferritin. The distribution is composed of a log-normal distribution plus a second distribution that is well described by an exponential decay of barrier frequency with increasing barrier height. The two distributions contribute approximately equally to the overall distribution. The log-normal distribution has its peak at an energy barrier of approximately 3 x 10(-21) J, while the decay constant for the second distribution has a value of approximately 2 x 10(-21) J. The existence of the low-energy barrier distribution with exponentially decaying shape in conjunction with the observation of shifted field-cooled magnetic hysteresis loops is interpreted as strong evidence for the existence of multiple interacting magnetic entities within each ferritin particle.
Original languageEnglish
Pages (from-to)024436
JournalPhysical Review B
Volume65
DOIs
Publication statusPublished - 2002

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