Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.29: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
Ferromagnetic writing on B2 Fe50Rh50 thin films using ultra-short laser pulses — •Alexander Schmeink1,2, Benedikt Eggert3, Jonathan Ehrler1, Mohamad Mawass4, René Hübner1, Kay Potzger1, Jürgen Lindner1, Jürgen Fassbender1,2, Florian Kronast4, Heiko Wende3, and Rantej Bali1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Fakultät für Physik, Technische Universität Dresden, Germany — 3Fakultät für Physik and CENIDE, Universität Duisburg-Essen, Germany — 4Helmholtz-Zentrum Berlin, Germany
Laser manipulation of magnetic properties has potential applications in data storage. B2 Fe50Rh50 alloy is well-known to show a temperature-driven antiferromagnetic (AFM) to ferromagnetic (FM) transition at ≈380 K. In contrast to the temperature-driven transition, FM regions can be induced via atomic rearrangements leading to antisite disorder, to form A2 Fe50Rh50. The above B2 → A2 transition can be realised in alloy thin films using ion beams as well as laser pulses, resulting in localized non-volatile FM writing.[1] Here, we irradiate B2 Fe50Rh50 thin films of ≤30 nm thicknesses with ∼100 fs short laser pulses and observe the induced magnetic and structural changes. Depending on the laser fluence, transitions of B2 Fe50Rh50 to A2 and with further disordering to the A1 structure are observed. The deposited energy influences the resolidifcation of the alloy, thereby determining the structure.
This work is funded by the DFG (BA 5656/1-1).
[1] J. Ehrler et al. ACS Applied Materials & Interfaces 2018 10 (17), 15232-15239