Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 11: Functional Antiferromagnetism

MA 11.6: Talk

Monday, March 18, 2024, 16:15–16:30, EB 202

Magnetization Dynamics in α-Fe₂O₃/NiFe Thin Film Bilayers — •Hassan Al-Hamdo¹, Tobias Wagner², Philipp Schwenke¹, Gutenberg Kendzo¹, Misbah Yaqoob¹, Maximilian Dausend¹, Laura Scheuer¹, Tamara Azevedo¹, Vitaliy I. Vasyuchka¹, Philipp Pirro¹, Olena Gomonay², and Mathias Weiler¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — ²Institute of Physics, JGU Mainz, 55099 Mainz, Germany

We experimentally investigate the magnetization dynamics in exchange-coupled bilayers of α-Fe₂O₃/Ni₈₀Fe₂₀ (Py). α-Fe₂O₃ is a canted antiferromagnet with small magnetic moment along the c-axis above the Morin temperature TM≈260 K. Below TM, α-Fe₂O₃ is a collinear antiferromagnet with Néel vector along the c-axis [1-3]. We deposit polycrystalline 10-nm Py thin films on α-Fe₂O₃ crystals and measure the bilayer magnetization dynamics as a function of temperature using broadband ferromagnetic resonance. We observe that the coupling of dynamic α-Fe₂O₃ and Py moments depends on both: temperature and crystalline orientation of α-Fe₂O₃, resulting in qualitatively different dynamics than previously observed by us in Mn₂Au/Py [4].
[1] D. Schroeer et al, Phys. Rev. Lett. 19, 632 (1967).
[2] G. Haigh et al, Philos. Mag. 2, 877-890 (1957).
[3] G. Rollmann et al, Phys. Rev. B 69, 165107 (2004).
[4] H. Al-Hamdo et al, Phys. Rev. Lett. 131, 046701 (2023).

Keywords: Spintonics; Functional Antiferromagnets; Magnonics; Spin Dynamics; Heterostructures