Artículo
Correlation between magnetic interactions and domain structure in A1 FePt ferromagnetic thin films
Alvarez, Nadia Roxana
; Sallica Leva, E.; Valente, R. C.; Vásquez Mansilla, M.; Gómez, J.; Milano, Julian
; Butera, Alejandro Ricardo
Fecha de publicación:
02/2014
Editorial:
American Institute of Physics
Revista:
Journal of Applied Physics
ISSN:
0021-8979
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We have investigated the relationship between the domain structure and the magnetic interactions in a series of FePt ferromagnetic thin films of varying thickness. As-made films grow in the magnetically soft and chemically disordered A1 phase that may have two distinct domain structures. Above a critical thickness dcr ∼ 30 nm the presence of an out of plane anisotropy induces the formation of stripes, while for d < dcr planar domains occur. Magnetic interactions have been characterized using the well known DC demagnetization - isothermal remanent magnetization remanence protocols, δM plots, and magnetic viscosity measurements. We have observed a strong correlation between the domain configuration and the sign of the magnetic interactions. Planar domains are associated with positive exchange-like interactions, while stripe domains have a strong negative dipolar-like contribution. In this last case we have found a close correlation between the interaction parameter and the surface dipolar energy of the stripe domain structure. Using time dependent magnetic viscosity measurements, we have also estimated an average activation volume for magnetic reversal, 〈V ac〉∼1.37×104 nm3, which is approximately independent of the film thickness or the stripe period.
Palabras clave:
Magnetic Films
,
Demagnetization
,
Thin film structure
,
Remanence
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Alvarez, Nadia Roxana; Sallica Leva, E.; Valente, R. C.; Vásquez Mansilla, M.; Gómez, J.; et al.; Correlation between magnetic interactions and domain structure in A1 FePt ferromagnetic thin films; American Institute of Physics; Journal of Applied Physics; 115; 8; 2-2014; 83907-83917
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