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 13.16: Poster

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

Cluster formation and its influence on the magnetic properties of MnBi. — •A. Merico, H. Kierey, A. Borgschulte, D. Menzel, and J. Schoenes — Institut für Halbleiterphysik und Optik, TU Braunschweig

MnBi thin films have been prepared by Molecular Beam Epitaxy (MBE). To this goal single crystalline bismuth layers have been grown on BaF₂(111) substrates and Mn layers have been alloyed into Bi. The morphology and the magnetic properties of the films have been investigated by in-situ RHEED, ex-situ STM, and SQUID measurements. A maximum value of 25 kOe for the coercitivity has been found, confirming earlier experiments on the same subject.
In this contribution we report on the dependence of the magnetic properties on the sample morphology. Very strong correlations between the annealing temperature and morphology as well as Mn content and morphology have been observed.