Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Thin Films: Magnetic Anisotropy
MA 55.2: Vortrag
Donnerstag, 23. März 2017, 15:15–15:30, HSZ 101
A new interstitial compound: Fe-B — •Dominik Gölden, Erwin Hildebrandt, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, Germany
One of the most promising potential permanent magnet candidates of the last decades, α″-Fe16N2, has a low decomposition temperature of about 180 ∘C, making it unsuitable for many applications. One alternative is replacing the nitrogen interstitials with boron. This system is predicted to yield similar or even higher saturation magnetization and anisotropy while having a higher decomposition temperature. Previous studies suggest that boron prefers to occupy substitutional positions over interstitial positions. We explored the Fe-B system with boron content below 15% by molecular beam epitaxy (MBE). An increasing tetragonalization was observed, pointing at an interstitial occupation of boron. The measured c/a ratio increased with decreasing growth temperature and scaled linearly with the boron content up to a maximum of 1.07 with a magnetization of about 1580 emu/cm3. However, in contrast to nitrogen interstitials, the interstitial Fe-B system could be grown at up to 300 ∘C, making it potentially a much more interesting candidate for permanent magnets.