Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.52: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster C

Static magnetic properties of ferromagnetic iron-nickel alloys in the Stoner model — •Sevim Kilic, Christopher Seibel, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Germany

In a previous work by Hofherr et al. [1], the direct, ultrafast and coherent spin transfer between subsystems of iron-nickel (NiFe) alloys through optical excitation (OISTR effect) was experimentally demonstrated. For this purpose, the spin-resolved density of states (DOS), which is essential for explaining the OISTR effect, was directly calculated using density functional theory (DFT). Now, we want to understand how well these spin-resolved DOS and their exchange splittings can be approximated with shifted paramagnetic density of states in the framework of the Stoner model.

Our research involves the investigation of paramagnetic density of states in NiFe alloys, which were determined by weighted averaging of pure iron and nickel DOS. The self-determined DOS were compared to DFT-calculated DOS of NiFe alloys from literature [2]. We then analyze the magnetization resulting from the application of the Stoner model to both model assumptions and compare it to the magnetization of Permalloy obtained from DFT calculations [3].

[1] M. Hofherr et al., Sci. Adv. 6, 8717 (2020)

[2] http://compmat.org/electron-phonon-coupling/

[3] S. Sharma, MBI Berlin, private communication (2023)

Keywords: Permalloy, Curie curve, Stoner model