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 60.4: Talk
Friday, March 20, 2020, 10:15–10:30, HSZ 04
Magnetic anisotropy of disordered FeRh thin films probed by X-band ferromagnetic resonance — •Jonas Wiemeler1, Anna Semisalova1, Benjamin Zingsem1, Nicolas Josten1, Ralf Meckenstock1, Rantej Bali3, Kay Potzger3, Jürgen Lindner3, Jürgen Fassbender3, Thomas Thomson2, and Michael Farle1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 2The University of Manchester, UK — 3Institute of Ion Beam Physics and Materials Research, HZDR, Germany
The ion irradiation induced disorder in FeRh thin films changes certain magnetic properties, such as phase transition temperature from AF to FM states and saturation magnetisation. Furthermore, the free energy density changes correspondingly to the magnetocrystalline anisotropy variation in irradiated films. Here, ferromagnetic resonance (FMR) experiments were carried out to analyse the magnetic anisotropy of 25 keV Ne+-irradiated 40 nm thick Fe50Rh50 films. A total of 6 films, irradiated with an ion fluence of 1 ·1013− 4 ·1014 Ions/cm2, were characterised with FMR at 100 - 400 K and compared with a non-irradiated film.
The anisotropy of Ne-irradiated FeRh thin film changes from cubic for a low ion fluence to a mixture of cubic and in-plane uniaxial anisotropy, the latter contribution turns out to be dominating for higher fluence. The sign of the perpendicular magnetic anisotropy constant KU=K2⊥ was found to reverse while Ne+ fluence is increasing. Supported by DFG SE2853/1-1, BA5656/1-1.