Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Magnetic Thin Films I
MA 11.5: Vortrag
Montag, 7. März 2016, 16:00–16:15, H33
Fe-N phase diagram of MBE grown thin films — •Dominik Gölden, Erwin Hildebrandt, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, Germany
The iron nitride system has been widely investigated due to the large variety of mechanical, electrical, and magnetic properties of the different phases. We explored the phase diagram of Fe-N thin films grown by molecular beam epitaxy (MBE). At elevated temperatures around 350 ∘C, γ′-Fe4N is the most stable phase. At low temperatures, α′-Fe8N, є-Fe3N and FeN were obtained by varying the growth rate and the nitrogen supply. At identical growth conditions the choice of substrate materials results in preferential growth of different iron nitride phases. The structural and magnetic properties of the thin films were in agreement with bulk properties. α′-Fe8N, which is not a real thermodynamical phase, could not be obtained without admixture of other Fe-N phases. No evidence for the ordered phase α″-Fe16N2 was found even when the Fe-N phase diagram was scanned by thin film deposition with high resolution. While γ′-Fe4N related materials might be useful for spintronics, the Fe-N system is probably not suited for permanent magnetic materials due to the high volatility of N.