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Zero-temperature spin-glass freezing in self-organized arrays of Co nanoparticles

AuthorsLópez-Ruiz, R.; Luis, Fernando; Sesé Monclús, Javier ; Bartolomé, Juan
Issue Date2010
PublisherInstitute of Physics Publishing
CitationEurophysics Letters 89(6): 67011 (2010)
AbstractWe study, by means of magnetic-susceptibility and magnetic-aging experiments, the nature of the glassy magnetic dynamics in arrays of Co nanoparticles, self-organized in N layers from N=1 (two-dimensional limit) up to N=20 (three-dimensional limit). We find no qualitative differences between the magnetic responses measured in these two limits, in spite of the fact that no spin-glass phase is expected above T=0 in two dimensions. More specifically, all the phenomena (critical slowing-down, flattening of the field-cooled magnetization below the blocking temperature and the magnetic memory induced by aging) that are usually associated with this phase look qualitatively the same for two-dimensional and three-dimensional arrays. The activated scaling law that is typical of systems undergoing a phase transition at zero temperature accounts well for the critical slowing-down of the dc and ac susceptibilities of all samples. Our data show also that dynamical magnetic correlations achieved by aging a nanoparticle array below its superparamagnetic blocking temperature extend mainly to nearest neighbors. Our experiments suggest that the glassy magnetic dynamics of these nanoparticle arrays is associated with a zero-temperature spin-glass transition.
Description6 páginas, 6 figuras.-- El pdf del artículo es la versión pre-print: arXiv:1103.4492.-- et al.
Publisher version (URL)http://dx.doi.org/10.1209/0295-5075/89/67011
Appears in Collections:(ICMA) Artículos
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