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MM: Fachverband Metall- und Materialphysik

MM 28: Poster Session II

MM 28.16: Poster

Dienstag, 17. März 2015, 18:30–20:30, Poster E

Investigation of the magnetic phase transition in iron-rhodium thin films by ferromagnetic resonance — •Alirerza Heidarian¹, Jürgen Lindner¹, Rantej Bali¹, Kay Potzger¹, Jörg Grenzer¹, Sven Hoffmann¹, Michael Farle², and Florian Römer² — ¹HZDR Institute of Ion-Beam Physics and Materials Research, Dresden, Germany — ²Faculty of Physics and Center for Nanointegration, University of Duisburg-Essen, Duisburg, Germany

Due to the first-order phase transition from an antiferromagnetic (AF) to a ferromagnetic (F) state at 370 K, the equiatomic FeRh alloy has raised growing interest. In our study, the phase transition of FeRh thin films was analyzed by means of ferromagnetic resonance (FMR). Fe₅₀Rh₅₀ films are obtained by molecular beam epitaxy on MgO single-crystal substrates. The films are 37 nm and 6 nm thick and were co-deposited from separate Fe and Rh sources. FMR was observed in an X-band cavity set-up, with variable temperature. As the temperature crosses 370 K, resonance lines associated with the F phase appear. Furthermore, resonance lines due to possible acoustic- and optical- resonance modes are observed. Our measurements show that temperature dependent FMR can be used to determine the relative volumes of AFM and FM regions across phase transition. The transition from AF to F coupling can therefore be tracked using FMR measurements. Moreover, the phase transition temperature for 6 nm thick film is 285 K which resonance lines of F phase emerge. Therefore FMR can be an effective tool in unraveling coupling phenomena in FeRh.