Raman fingerprint of two terahertz spin wave branches in a two-dimensional honeycomb Ising ferromagnet

Wencan Jin, Hyun Ho Kim, Zhipeng Ye, Siwen Li, Pouyan Rezaie, Fabian Diaz, Saad Siddiq, Eric Wauer, Bowen Yang, Chenghe Li, Shangjie Tian, Kai Sun, Hechang Lei, Adam W. Tsen, Liuyan Zhao () and Rui He ()
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Wencan Jin: University of Michigan
Hyun Ho Kim: University of Waterloo, Waterloo, 200 University Ave W
Zhipeng Ye: Texas Tech University
Siwen Li: University of Michigan
Pouyan Rezaie: Texas Tech University
Fabian Diaz: Texas Tech University
Saad Siddiq: Texas Tech University
Eric Wauer: Texas Tech University
Bowen Yang: University of Waterloo, Waterloo, 200 University Ave W
Chenghe Li: Renmin University of China
Shangjie Tian: Renmin University of China
Kai Sun: University of Michigan
Hechang Lei: Renmin University of China
Adam W. Tsen: University of Waterloo, Waterloo, 200 University Ave W
Liuyan Zhao: University of Michigan
Rui He: Texas Tech University

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Two-dimensional (2D) magnetism has been long sought-after and only very recently realized in atomic crystals of magnetic van der Waals materials. So far, a comprehensive understanding of the magnetic excitations in such 2D magnets remains missing. Here we report polarized micro-Raman spectroscopy studies on a 2D honeycomb ferromagnet CrI3. We show the definitive evidence of two sets of zero-momentum spin waves at frequencies of 2.28 terahertz (THz) and 3.75 THz, respectively, that are three orders of magnitude higher than those of conventional ferromagnets. By tracking the thickness dependence of both spin waves, we reveal that both are surface spin waves with lifetimes an order of magnitude longer than their temporal periods. Our results of two branches of high-frequency, long-lived surface spin waves in 2D CrI3 demonstrate intriguing spin dynamics and intricate interplay with fluctuations in the 2D limit, thus opening up opportunities for ultrafast spintronics incorporating 2D magnets.

Date: 2018
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DOI: 10.1038/s41467-018-07547-6

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