Artículo
Abnormal Temperature Dependence of the Coercive Feld in FePt thin films
Guzmán, Jonás Manuel
; Alvarez, Nadia Roxana
; Salva, Horacio Ramon
; Vasquez Mansilla, Marcelo
; Gomez, Javier Enrique
; Butera, Alejandro Ricardo
Fecha de publicación:
12/2013
Editorial:
Elsevier Science
Revista:
Journal Of Magnetism And Magnetic Materials
ISSN:
0304-8853
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We have observed notable changes in the magnetic response of FePt thin films that we have attributed to a transition in the magnetic domain structure when the film thickness or the temperature is varied. The critical thickness for this transition depends on the Q-factor, Q=Kperp/2PiMs^2, so that a change in thedomain structure is expected when changes in the perpendicular anisotropy, Kperp , or the saturation magnetization, Ms, occur. At room temperature these samples have Q ~ 0:3, and a transition between planar to stripe-like domains occurs for a film thickness d ~ 30 nm. Due to the different thermal expansion of the FePt alloy and the Si substrate a reduction in Q is predicted when the temperature is lowered. From magnetization vs. field loops measured at different temperatures below T=300 K, we have effectively observed a change in the coercive field which can be associated to a transition from stripe-like to in-plane domains. The transition temperature range is broad, indicating a gradual variation between the two magnetic configurations, but changes systematically with film thickness, consistent with an interfacial induced stress. A model that includes the temperature dependence of the strain and the magnetization, predicts correctly the observation of a larger critical thickness at lower temperatures.
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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
Guzmán, Jonás Manuel; Alvarez, Nadia Roxana; Salva, Horacio Ramon; Vasquez Mansilla, Marcelo; Gomez, Javier Enrique; et al.; Abnormal Temperature Dependence of the Coercive Feld in FePt thin films; Elsevier Science; Journal Of Magnetism And Magnetic Materials; 347; 12-2013; 61-67
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