

Spin-wave based data transport and information processing aims to complement computation technology by exploiting wave logic, with the benefits of potentially reducing the feature size, as well as allowing for data multiplexing and more energy efficient operations [1]. Recent studies provide advanced theoretical models for nano-scaled spin-wave conduits and revealed a reasonably long propagation distance for longitudinally magnetized conduits, thus proving the fundamental feasibility of magnonics at the sub-100nm scale [2]. In contrast, little focus has been put on transversely magnetized nano-conduits. However, these systems are of great interest offering a large group velocity and a potentially protected transport of energy and information caused by the intrinsic chirality of the spin-wave modes [3]. Thus, they promise a significantly enhanced spin-wave decay length. Here, we present a study of propagating spin-wave packets in a transversely magnetized nanoscopic yttrium iron garnet conduit of 50 nm width and 44 nm thickness. Pulsed spin-wave packets are exicted using a coplanar waveguide antenna. Space and time-resolved micro-focused Brillouin-light-scattering spectroscopy is employed to measure the spin-wave group velocity and decay length. As shown in Fig. 1A, a long-range spin-wave propagation is observed with a decay length of up to 8 µm, which is multiple times larger than reported values for the corresponding longitudinal magnetized state [2]. In addition, a large spin-wave lifetime of up to 44.7 ns is found, see Fig. 1B. The results are supported with micro-magnetic simulations, revealing a frequency non-reciprocity for counter-propagating spin waves, see Fig. 1 C, caused by the trapezoidal cross-section of the studied structure and the associated curved internal field distribution which introduces a spacial symmetry break. The presence of this non-reciprocity is experimentally verified and is particularly interesting for an application in spin-wave devices since it allows for a novel device architecture and low-loss unidirectional data transport.

**References:**

[1] A. Mahmoud, F. Ciubotaru, F. Vanderveken, A. V. Chumak, S. Hamdioui, C. Adelmann and S. Cotofana<br/>J. of Appl. Phys. 128, 161101 (2020).<br/>[2] B. Heinz, T. Brächer, M. Schneider, Q. Wang, B. Lägel, A. M. Friedel, D. Breitbach, S. Steinert, T. Meyer, M. Kewenig, C. Dubs, P. Pirro, and A. V. Chumak, “Propagation of spin-wave packets in individual nano-sized yttrium iron garnet magnonic conduits,” Nano Lett. 20, 4220–4227 (2020).<br/>[3] M. Mohseni, R. Verba, T. Brächer, Q. Wang, D. A. Bozhko, B. Hillebrands, and P. Pirro, “Backscattering immunity of dipole-exchange magnetostatic surface spin waves,” Phys. Rev. Lett.122, 197201 (2019).

**Images:**

![](https://assets.underline.io/uploads/markdown_image/1/image/4526d049eeed65a5eb4fdfcbe73371b6.jpg)
Fig. 1 (A) Group velocity and decay length measured via microfocused BLS spectroscopy. The light gray curve is the associated cw excitation spectrum. Frequency shifted due to a magnetic field difference of 0.2 mT. (B) Experimental lifetime derived from the decay length and group velocity. (C) Results of the micro-magnetic simulations. A frequency non-reciprocity is observed for counter-propagating spin waves.



 Long-range propagation of spin waves in transversely magnetized nano-scaled yttrium iron garnet conduits

*Session Co-Chair: Oleksandr Dobrovolskiy, University of Vienna*

*Session Co-Chair: Qi Wang, Universitat Wien*

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EE: Nanoscale and Applied Magnonics

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Long-range propagation of spin waves in transversely magnetized nano-scaled yttrium iron garnet conduits

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