Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 46: Ion and Electron Beam Induced Processes

DS 46.1: Vortrag

Freitag, 24. März 2017, 09:30–09:45, CHE 89

Tuning of magnetic and structural properties of Fe60Al40 thin films by ion irradiation — •Jonathan Ehrler1,2, Rantej Bali1, Roman Böttger1, Jörg Grenzer1, and Kay Potzger11Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany — 2Dresden University of Technology, Helmholtzstrasse 10, 01069 Dresden, Germany

The effects of ion implantation on the structural and magnetic properties of Fe60Al40 films, possessing A2 and B2 structure respectively, have been investigated by means of X-ray diffraction and Vibrating sample magnetometry. The studies show that the magnetic properties of the 250 nm thick Fe60Al40 films depend on the structural order only. The chemical disorder induced evolution of ferromagnetism comes along with an abrupt disappearance of the (100)-superlattice peak.

The irradiation of paramagnetic B2 Fe60Al40 with H+, He+ or Ne+ ions with different fluences at low temperatures led to an increase of saturation magnetization (MS) going along with a lattice expansion induced by structural disorder. This effect did not appear for proton irradiation at elevated temperatures (250 C) where the ordered B2 phase was retained. Upon low temperature hydrogen implantation of disordered A2 Fe60Al40 films, on the other hand, unlike for helium or neon irradiation, the lattice parameter and MS decreased indicating a little ordering. This might offer the possibility of H+ irradiation induced ordering of chemically disordered alloy thin films well below the ordering temperature.

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