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Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 60: Magnetic Coupling and Anisotropy in Thin Films (joint session MA/DS)

MA 60.5: Talk

Friday, March 20, 2020, 10:30–10:45, HSZ 04

Ferromagnetic writing on B2 Fe49Rh51 thin films using ultra-short laser pulses — •Alexander Schmeink1,2, Benedikt Eggert3, Jonathan Ehrler1, Mohamad-Assaad Mawass4, René Hübner1, Kay Potzger1, Jürgen Lindner1, Jürgen Fassbender1,2, Florian Kronast4, Heiko Wende3, and Rantej Bali11Helmholtz-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. The equiatomic B2 FeRh alloy is well-known to show a metamagnetic isostructural antiferromagnetic (AFM) to ferromagnetic (FM) transition at ≈370 K. In contrast to the temperature-driven transition an AFM B2 → FM B2 transition can be induced via a decrease of short-range atomic order, which can be realised in alloy thin films using ion beams as well as laser pulses.[1]

Here we irradiate B2 Fe49Rh51 thin films of ≤30 nm thicknesses with ∼100 fs laser pulses and observe the induced magnetic and structural changes. Depending on the laser fluence transitions of AFM to FM B2 Fe49Rh51 and with further disordering to the paramagnetic 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 and WE 2623/14-1).

[1] J. Ehrler et al. ACS Applied Materials & Interfaces 2018 10 (17), 15232-15239

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