•Sarbari Bhattacharya1, B. Stahl1,2, M. Ghafari1
und H. Hahn1
1Fachbereich Material- und Geowissenschaften, Petersenstr.
23, TU Darmstadt, 64287 Darmstadt
2Institiut für Nanotechnologie, Forschungszentrum Karlsruhe,
76021 Karlsruhe
We have already reported the observation of a wetting phenomena near
the Néel temperature in single crystalline FeBO3. DCEMS
experiments carried out on two g-FeOOH thin
films of different thicknesses reveal a similar magnetic behaviour. Two
main components can be seen in the Mössbauer Spectrum measured at
10K for the thicker film . One component is clearly bulk like. The average
hyperfine field of this component varies in a manner analogous to that
of bulk g-FeOOH with rise in temperature indicating
that it has the same Néel temperature. The magnetization dynamics
with increasing temperature of the other component, on the other hand,
is clearly very different. It shows marked similarities with the behaviour
of the wetting layer in single crystalline FeBO3.