Study of reorientation processes in L10-ordered FePt thin films

Autor(en)

Marcus Rennhofer, Miroslaw Kozlowski, Bart Laenens, Bogdan Sepiol, Rafal Kozubski, Dries Smeets, A Vantomme

Abstrakt

We report on the development of structural and magnetic order in epitaxially grown L1(0) FePt thin films. Upon annealing, the easy axis of magnetization changes from the out-of-plain into the in-plain direction. We found that the overall fraction of reoriented domains first increases but after certain time decreases before achieving a saturated state. The results are based on conversion electron Mossbauer spectroscopy studies and confirm Monte Carlo simulations in nano-layered FePt. We present a modified version of the Johnson-Mehl-Avrami (JMA) model adequately describing the experimental findings. Two dynamical processes, the first being a 2D-growth. dominate the initial state of sample annealing and the second being a 3D-growth, dominate the late stage close to saturation From an Arrhenius plots of JMA coefficients for both processes we extracted the activation energies of the underlying dynamics which are 1.5(1) eV for disordering and 0.8(2) eV for ordering.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

Jagiellonian University in Krakow, Katholieke Universiteit Leuven

Journal

Intermetallics

Band

18

Seiten

2069-2076

Anzahl der Seiten

8

ISSN

0966-9795

DOI

https://doi.org/10.1016/j.intermet.2010.06.011

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103020 Oberflächenphysik, 103009 Festkörperphysik, 210006 Nanotechnologie, 103018 Materialphysik

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/study-of-reorientation-processes-in-l10ordered-fept-thin-films(19f61b13-7f49-4c58-a017-11b0dccc61d9).html