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 13.93: Poster

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

Magnetism in thin Fe films grown on InP(001) — •F. Zavaliche, W. Wulfhekel und J. Kirschner — MPI für Mikrostrukturphysik, Weinberg 2, 06120 Halle

We present first results on the growth and magnetic properties of thin Fe films deposited by molecular beam epitaxy on InP(001). The InP(001) crystals were cleaned by degassing at 500 K in ultra high vacuum, followed by mild sputtering with Ar ions at the same temperature, until no traces of contamination were detected in the Auger electron spectra and flat surfaces were seen in the scanning tunneling micrographs. A c(8x2) surface reconstruction is obtained, as determined by low energy electron diffraction. Fe was deposited at different temperatures ranging from room temperature (RT) to 150 K. The onset of magnetization takes place at Fe coverages of about 3.5 monolayers (ML) and 2.5 ML at RT and 150 K, respectively, with the magnetic moment oriented in-plane. We show that a strong uniaxial in-plane magnetic anisotropy persists from the magnetization onset coverage up to about 10 ML, with the easy axis oriented perpendicular to the reconstruction rows. Electrical measurements in the four-point geometry were done on a laterally structured film with the aim of estimating the Schottky barrier.