Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 11: Functional Antiferromagnetism
MA 11.4: Talk
Monday, March 18, 2024, 15:45–16:00, EB 202
Impact of growth conditions on magnetic anisotropy and magnon Hanle effect in α-Fe2O3 — •Monika Scheufele1,2, Janine Gückelhorn1,2, Matthias Opel1, Akashdeep Kamra3, Hans Huebl1,2,4, Rudolf Gross1,2,4, Stephan Geprägs1, and Matthias Althammer1,2 — 1Walther-Meißner-Institut, BAdW, Garching, Germany — 2TUM School of Natural Sciences, Physics Department, TUM, Garching, Germany — 3IFIMAC and Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain — 4Munich Center for Quantum Science and Technology, Munich, Germany
The antiferromagnetic insulator α-Fe2O3 exhibits a spin-reorientation transition (Morin transition) at TM = 263 K − a feature often absent in thin films. To tune TM, we investigate the impact of different growth conditions on the magnetic anisotropy in α-Fe2O3 films [1]. Unlike for films deposited in a molecular oxygen atmosphere, we observe a finite TM for those grown in atomic oxygen even down to a thickness of 19 nm. Furthermore, we observe a clear impact of the growth conditions on the magnon Hanle effect, i.e. the precession of magnon pseudospin around its equilibrium pseudofield in easy-plane antiferromagnets. The maximum magnon Hanle signal is significantly enhanced and the peak position shifted to lower magnetic field values for films grown in atomic oxygen, suggesting changes in the magnetic anisotropy. This shows that the growth conditions allow to fine-tune the magnetic anisotropy in α-Fe2O3 and thereby to engineer the magnon Hanle effect.
[1] M. Scheufele et al., APL Mater. 11, 091115 (2023).
Keywords: Magnetic anisotropy; Magnetotransport; Magnonics; Thin films; Antiferromagnetism