Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures

Zhang, Jianyu and Chen, Mingfeng and Chen, Jilei and Yamamoto, Kei and Wang, Hanchen and Hamdi, Mohammad and Sun, Yuanwei and Wagner, Kai and He, Wenqing and Zhang, Yu and Ma, Ji and Gao, Peng and Han, Xiufeng and Yu, Dapeng and Maletinsky, Patrick and Ansermet, Jean-Philippe and Maekawa, Sadamichi and Grundler, Dirk and Nan, Ce-Wen and Yu, Haiming. (2021) Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures. Nature Communications, 12 (1). ARTN 7258.

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Long-distance magnon transport is highly desired for magnonics. Here, the authors demonstrate a millimetre-long magnon decay length in multiferroic heterostructures, which is attributed to magnon-polarons induced by the magnetoelastic coupling.
Magnons can transfer information in metals and insulators without Joule heating, and therefore are promising for low-power computation. The on-chip magnonics however suffers from high losses due to limited magnon decay length. In metallic thin films, it is typically on the tens of micrometre length scale. Here, we demonstrate an ultra-long magnon decay length of up to one millimetre in multiferroic/ferromagnetic BiFeO3(BFO)/La0.67Sr0.33MnO3(LSMO) heterostructures at room temperature. This decay length is attributed to a magnon-phonon hybridization and is more than two orders of magnitude longer than that of bare metallic LSMO. The long-distance modes have high group velocities of 2.5 km s(-1) as detected by time-resolved Brillouin light scattering. Numerical simulations suggest that magnetoelastic coupling via the BFO/LSMO interface hybridizes phonons in BFO with magnons in LSMO to form magnon-polarons. Our results provide a solution to the long-standing issue on magnon decay lengths in metallic magnets and advance the bourgeoning field of hybrid magnonics.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Georg H. Endress-Stiftungsprofessur für Experimentalphysik (Maletinsky)
UniBasel Contributors:Maletinsky, Patrick M.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:11 Apr 2022 16:03
Deposited On:11 Apr 2022 16:03

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