INVESTIGADORES
VASQUEZ MANSILLA Marcelo
artículos
Título:
Thickness and temperature de pendence of the dynamic magnetic behavior in disordered FePt films
Autor/es:
VASQUEZ MANSILLA, MARCELO; GOMEZ, JAVIER; SALLICA LEVA EDWIN; CASTILLO GAMARRA FRANCISCO; ASENJO BARAHONA A.; BUTERA, ALEJANDRO
Revista:
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2009 vol. 321 p. 2941 - 2945
ISSN:
0304-8853
Resumen:
We present in this work an
investigation of the magnetic behavior of FePt films as afunction of
film thickness and thermal treatment. The
films have been sputter-deposited on oxidized Si (100) crystals and
are ferromagnetic at room temperature. Using ferromagnetic resonance
techniques at 9.5 GHz we have studied a series off our films with a
thickness in the range 10 nm < t < 100 nm.The resonance spectra
of these films were measured at and also above room temperature. The
high temperature measurements produce irreversible changes in the
samples which depend on the maximum temperature reached during the
experiment. For relatively low measuring temperatures(T<200 °C)
the magnetic properties are generally improved, probably due to the
release of stress formed during film fabrication. For larger
temperatures (T>200 °C) the absorption line width gradually
broadens and the line could behardly observed at room temperature if
the measuring temperature exceeded 300 °C. This behavior is due to
the partial transformation of the metastable FCC phase to the ordered
L10 high anisotropy phase.These data are consistent with the results
found in samples annealed outside the resonant cavity.