Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 39: Thin Film Applications
DS 39.9: Vortrag
Donnerstag, 23. März 2017, 11:45–12:00, CHE 91
Ion-beam-induced magnetic and structural phase transformation of fcc Fe thin films on different substrates — •Jonas Gloss1, Michal Horký1,2, Bernhard Ruch1, Viola Křižáková2, Lukáš Flajšman2,3, Michael Schmid1, Michal Urbánek2,3, and Peter Varga1,3 — 1Inst. of Appl. Phys., TU Wien, AT — 2Inst. of Phys. Engineering, Brno University of Technology (BUT), CZ — 3Central European Inst. of Tech. BUT, CZ
It has been shown that 5-10 ML thick Fe films on Cu(100) 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 nonmagnetic to ferromagnetic. To remove the 10-ML thickness limit of fcc Fe we alloyed it with 22% of Nickel to form the metastable fcc Fe [2]. To make use of the metastable films for magnonic crystals, we replaced the Cu(100) with two new alternative substrates H-Si(100) and C(100), which are also more suitable for applications and optical analysis. The first substitute is hydrogen terminated Si(100) with a Cu buffer layer. The as-grown Fe78Ni22 is corrugated, but metastable. The second successfully adapted substrate is undoped diamond C(001), on which metastable Fe78Ni22 films can be grown in 4-ML steps followed by post annealing.
[1] A.Biedermann, R.Tscheließnig, M.Schmid and P.Varga, Phys. Rev. Lett. 87 (2001) 086103
[2] J. Gloss, S. Shah Zaman, J. Jonner, Z. Novotny, M. Schmid, P. Varga, M. Urbánek, Appl. Phys. Lett. 103 (2013) 262405