Shifted loops and coercivity from field-imprinted high-energy barriers in ferritin and ferrihydrite nanoparticles
authors Silva, NJO; Amaral, VS; Urtizberea, A; Bustamante, R; Millan, A; Palacio, F; Kampert, E; Zeitler, U; de Brion, S; Iglesias, O; Labarta, A
nationality International
journal PHYSICAL REVIEW B
keywords THERMAL FLUCTUATIONS; MAGNETIC-PROPERTIES; EXCHANGE BIAS; ANISOTROPY; PARTICLE; ASSEMBLIES; ALLOYS
abstract We show that the coercive field in ferritin and ferrihydrite depends on the maximum magnetic field in a hysteresis loop and that coercivity and loop shifts depend both on the maximum and cooling fields. In the case of ferritin, we show that the time dependence of the magnetization also depends on the maximum and previous cooling fields. This behavior is associated to changes in the intraparticle energy barriers imprinted by these fields. Accordingly, the dependence of the coercive and loop-shift fields with the maximum field in ferritin and ferrihydrite can be described within the frame of a uniform-rotation model considering a dependence of the energy barrier with the maximum and the cooling fields.
publisher AMER PHYSICAL SOC
issn 1098-0121
year published 2011
volume 84
issue 10
digital object identifier (doi) 10.1103/PhysRevB.84.104427
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000294922100006
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journal impact factor 3.575
5 year journal impact factor 3.511
category normalized journal impact factor percentile 70.187
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