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Title: Shifted loops and coercivity from field imprinted high energy barriers in ferritin and ferrihydrite nanoparticles
Author: Silva, N. J. O.
Amaral, V. S.
Urtizberea, A.
Bustamante, R.
Millán, A.
Palacio, F.
Kampert, E.
Zeitler, U.
Brion, Sophie de
Iglesias, Òscar
Labarta, Amílcar
Keywords: Nanopartícules
Propietats magnètiques
Magnetic properties
Issue Date: 2011
Publisher: American Physical Society
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.
Note: Reproducció del document publicat a:
It is part of: Physical Review B, 2011, vol. 84, p. 104427-1-104427-7
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ISSN: 1098-0121
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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