Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Altermagnets I

MA 2.8: Vortrag

Montag, 9. März 2026, 11:30–11:45, HSZ/0004

Angle-dependent magnetoresistance induced by interface-generated spin current in RuO₂permalloy heterostructures — Akashdeep Akashdeep¹, Ewiese Mohammad Ababneh², Christin Schmitt¹, Edgar Galíndez-Ruales¹, Felix Fuhrmann¹, Timo Kuschel¹, Mathias Kläui¹, Vivek Amin², and •Gerhard Jakob¹ — ¹Johannes Gutenberg University, Mainz, Germany — ²Indiana University, Indianapolis, USA

Ruthenium dioxide (RuO₂) is a promising altermagnetic candidate. In our PLD grown films clear signs of altermagnetism were found by photoemission [1] and optically induced spin polarization with d-wave symmetry [2]. However, recent reports suggest that RuO₂ may be nonmagnetic in its ground state. (100)-oriented RuO₂ films are expected to generate spin currents with transverse spin polarization parallel to the Neel vector. We investigated magnetotransport in epitaxial RuO₂permalloy (Py) heterostructures to examine spin Hall magnetoresistance and interfacial effects. Our measurements revealed a pronounced negative angular-dependent magnetoresistance that we attribute to interface-generated spin current (IGSC) at the RuO₂Py interface supported by drift-diffusion calculations. The interface effects predominate over possible altermagnetic contributions [3]. This finding is in accord with recent muon spin resonance on our films [4].

[1] O. Fedchenko et al., Sci. Adv. 10, eadj4883 (2024);

[2] M. Weber et al., arXiv2408.05187 (2024);

[3] A. Akashdeep et al., Phys. Rev. Appl. 24, 054018 (2025);

[4] A. Akashdeep et al., arXiv2510.08064 (2025);

Keywords: Altermagnet; RuO2; Magnetoresistance