Regensburg 2000 – wissenschaftliches Programm

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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

Dienstag, 28. März 2000, 16:00–20:00, A

Magnetooptical investigations on epitaxial Cr_xPt_1−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 Cr_xPt_1−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)