Regensburg 2002 – wissenschaftliches Programm
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MA: Magnetismus
MA 10: Poster : Dünne Schichten(1-21),Spinabh.Transp.(22-39),Exch.Bias(40-51),Spindyn.(52-55),Mikromag.(56-66),Partikel(67-74),Abb.Verf.(75-77),Oberfl.+Spinelektr.+Elektr.Theo+Mikromag(75-87),PÜ+Aniso+Werkst/Leg.(88-103),Mol.Mag.+N-dim+Messm.+Postdead(104-111
MA 10.15: Poster
Dienstag, 12. März 2002, 15:00–19:00, Bereich A
Growth of Fe3O4 on the Fe(110)/Mo(110)/Al2O3(1120) Substrate — •M. Fonine, Yu. S. Dedkov, U. Rüdiger, and G. Güntherodt — II. Physikalisches Institut RWTH Aachen, D-52056 Aachen
Recently, a high negative spin polarization of -80% at the Fermi level EF was measured at room temperature in the system Fe3O4(111)/Fe(110)/W(110) by means of spin- and angle-resolved photoemission spectroscopy [1], which makes Fe3O4(111) a promising material for magnetoelectronic devices. The investigation of the surface structure of Fe3O4(111) not grown on W(110) substrates is critical for investigating the spin-polarized transport effects in Fe3O4/insulator/Fe3O4 systems.
The surface structure of in situ oxidized 200 Å thick epitaxial Fe(110) films grown on Al2O3(1120) substrates using a Mo(110) buffer layer has been studied by means of low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). For oxygen exposure of 100 L followed by annealing at 775 K the formation of FeO(111) was observed. After high oxygen exposures (≥1500 L) and annealing at 975 K we obtained Fe3O4(111) films of high crystalline quality. Atomically resolved STM images of the Fe3O4(111) surface show hexagonal symmetry with 6 Å periodicity. The system was identified as an epitaxial Fe3O4(111)/Fe(110) bilayer.
[1] Yu. S. Dedkov, U. Rüdiger, and G. Güntherodt, Phys. Rev. B. in press (2001).