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Title: Interplay between surface anisotropy and dipolar interactions in an assembly of nanomagnets
Author: Sabsabi, Z.
Vernay, F.
Iglesias, Òscar
Kachkachi, H.
Keywords: Nanopartícules
Issue Date: 25-Sep-2013
Publisher: American Physical Society
Abstract: We study the interplay between the effects of surface anisotropy and dipolar interactions in monodisperse assemblies of nanomagnets with oriented anisotropy. We derive asymptotic formulas for the assembly magnetization, taking into account temperature, applied field, core and surface anisotropy, and dipolar interparticle interactions. We find that the interplay between surface anisotropy and dipolar interactions is well described by the analytical expression of the assembly magnetization derived here: the overall sign of the product of the two parameters governing the surface and the dipolar contributions determines whether intrinsic and collective terms compete or have synergistic effects on the magnetization. This is illustrated by the magnetization curves of γ-Fe2O3 nanoparticle assemblies in the low concentration limit.
Note: Reproducció del document publicat a:
It is part of: Physical Review B, 2013, vol. 88, p. 104424-1-104424-12
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ISSN: 1098-0121
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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