{ScnGdn} Heterometallic Rings: Tunable Ring Topology for Spin-Wave Excitations

Hao-Lan Zhang; Yuan-Qi Zhai; Hiroyuki Nojiri; Christian Schröder; Hung-Kai Hsu; Yi-Tsu Chan; Zhendong Fu; Yan-Zhen Zheng

doi:10.1021/jacs.2c05421

{Sc_nGd_n} Heterometallic Rings: Tunable Ring Topology for Spin-Wave Excitations

J Am Chem Soc. 2022 Aug 24;144(33):15193-15202. doi: 10.1021/jacs.2c05421. Epub 2022 Aug 4.

Authors

Hao-Lan Zhang¹, Yuan-Qi Zhai¹, Hiroyuki Nojiri², Christian Schröder^{3

4}, Hung-Kai Hsu⁵, Yi-Tsu Chan⁵, Zhendong Fu⁶, Yan-Zhen Zheng¹

Affiliations

¹ Frontier Institute of Science and Technology (FIST), State Key Laboratory of Mechanical Behavior for Materials, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Key Laboratory of Sustainable Energy and Materials Chemistry, School of Chemistry and School of Physics, Xi'an Jiaotong University, Xi'an 710054, Shaanxi, China.
² Institute for Materials Research (IMR), Tohoku University, Katahira, Sendai 980-8577, Japan.
³ Bielefeld Institute for Applied Materials Research, Bielefeld University of Applied Sciences, Bielefeld D-33619, Germany.
⁴ Faculty of Physics, Bielefeld University, Bielefeld D-33615, Germany.
⁵ Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan.
⁶ Neutron Platform, Songshan Lake Materials Laboratory, Dongguan 523808, China.

PMID: 35926139
DOI: 10.1021/jacs.2c05421

Abstract

Data carriers using spin waves in spintronic and magnonic logic devices offer operation at low power consumption and free of Joule heating yet requiring noncollinear spin structures of small sizes. Heterometallic rings can provide such an opportunity due to the controlled spin-wave transmission within such a confined space. Here, we present a series of {Sc_nGd_n} (n = 4, 6, 8) heterometallic rings, which are the first Sc-Ln clusters to date, with tunable magnetic interactions for spin-wave excitations. By means of time- and temperature-dependent spin dynamics simulations, we are able to predict distinct spin-wave excitations at finite temperatures for Sc₄Gd₄, Sc₆Gd₆, and Sc₈Gd₈. Such a new model is previously unexploited, especially due to the interplay of antiferromagnetic exchange, dipole-dipole interaction, and ring topology at low temperatures, rendering the importance of the latter to spin-wave excitations.