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J. Gloss:
"Magnetic nanostructures in metastable fcc Fe thin films on Si(100)";
Vortrag: Seminar Institut für Allgemeine Physik (IAP), TU Wien; 04.12.2018.

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. To remove the 10-ML thickness limit of fcc Fe we alloyed it with 22% of nickel to form a metastable fcc Fe78Ni22 [2] and used this system for fabrication of a magnonic crystal [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 [4].


[1] A.Biedermann, et al., Phys. Rev. Lett. 87 (2001) 086103
[2] J. Gloss, et al., Appl. Phys. Lett. 103 (2013) 262405
[3] M. Urbanek, APL Materials 6, (2018) 060701
[4] J. Gloss, et al., Appl. Surf. Sci. in press (2018)