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
DOIAbstract
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...
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