Direct observation of thermal relaxation in artificial spin ice.
Phys Rev Lett
; 111(5): 057204, 2013 Aug 02.
Article
em En
| MEDLINE
| ID: mdl-23952441
ABSTRACT
We study the thermal relaxation of artificial spin ice with photoemission electron microscopy, and are able to directly observe how such a system finds its way from an energetically excited state to the ground state. On plotting vertex-type populations as a function of time, we can characterize the relaxation, which occurs in two stages, namely a string and a domain regime. Kinetic Monte Carlo simulations agree well with the temporal evolution of the magnetic state when including disorder, and the experimental results can be explained by considering the effective interaction energy associated with the separation of pairs of vertex excitations.
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Base de dados:
MEDLINE
Assunto principal:
Nanopartículas de Magnetita
/
Imãs
/
Modelos Teóricos
Tipo de estudo:
Health_economic_evaluation
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article