Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Micro- and nanostructured magnetic materials
MA 39.7: Vortrag
Donnerstag, 15. März 2018, 11:00–11:15, H 0112
Magnetic nanostructures in metastable fcc Fe thin films on Cu(100) and Si(100) — •Jonas Gloss1, Michal Horký2, Michal Andrýsek3, Viola Křižáková3, Lukáš Flajšman2, Michael Schmid1, Michal Urbánek2,3, and Peter Varga1,2 — 1Inst. of Appl. Phys., TU Wien, AT — 2Central EU Inst. of Tech., Brno University of Technology (BUT), CZ — 3Inst. of Phys. Eng.,BUT, CZ
It has been shown that 5-10 ML thick Fe films grown on Cu(100) single crystal have an fcc structure and are nonmagnetic at room temperature [1]. Ion-beam irradiation of the fcc films causes a structural transformation from fcc to bcc, as well as a magnetic transformation from non- to ferromagnetic [2]. To remove the 10-ML thickness limit of fcc Fe we alloyed it with 22% of nickel to form a metastable fcc Fe78Ni22 [3].
To avoid the costly Cu single crystals, we also grew the films on H-terminated Si(100) with a Cu(100) buffer layer. The H-Si was prepared both in-situ by flashing and deposition of atomic H and ex-situ by etching in HF. The as-grown Fe78Ni22 films were corrugated yet metastable; we show they provide the opportunity to write magnetic nanostructures with a focused ion beam.
[1] A.Biedermann, et al., Phys. Rev. Lett. 87 (2001) 086103
[2] W. Rupp, et al., Appl. Phys. Lett. 93 (2008) 063102
[3] J. Gloss, et al., Appl. Phys. Lett. 103 (2013) 262405