Regensburg 2000 – scientific programme
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AM: Magnetismus
AM 13: Postersitzung: Dünne Schichten (1–22), Magnetowiderstand (23–40), Phasenübergänge (41–55), Mikromagnetismus (56–68), Spektroskopie (69–77), Nanokristalline Materialien (78–82), Anisotropie (83–86), Schmelzen (87–90), Weitere Bereiche (91–100)
AM 13.15: Poster
Tuesday, March 28, 2000, 16:00–20:00, A
Magnetooptical investigations on epitaxial CrxPt1−x films — •A.-M. Carsteanu, M. Broschwitz, A. Borgschulte, D. Menzel, and J. Schoenes — Institut für Halbleiterphysik und Optik, TU Braunschweig
Intermetallic compounds containing a 3d transition metal
and Pt have attracted much interest
due to their remarkable magnetooptical response. Especially, CrPt3 could
be a favourable candidate for
magnetooptical storage devices, because its magnetic easy axis lies
perpendicular to the film surface.
Thin
epitaxial CrxPt1−x films have been grown by molecular beam epitaxy
(MBE) on SrTiO3 substrates. In this
contribution we focus on films with Cr contents below 38 %, where the
alloy crystallizes in the cubic AuCu3
structure. The magnetooptical Kerr rotation and ellipticity have similar
structures for all samples, but the
absolute values depend strongly on the compositions. This behaviour has
also been observed in SQUID magnetization
measurements, as can be expected due to the proportionality of Kerr
rotation and magnetization. The origin of this
feature is the disappearance of magnetic ordering for Cr concentrations far
from 25 %, i.e. if Cr sites are
occupied by Pt atoms and vice versa. The shape of the spectra show a good
agreement with calculations of Oppeneer
et al. [1].
[1] P. M. Oppeneer et al., J. Phys: Cond. Matter 8, 5769 (1996)