Raman Shifts in Two-Dimensional van der Waals Magnets Reveal Magnetic Texture Evolution

Huang, Zhengjie; McCray, Arthur C.; Li, Yue; Morrow, Darien J.; Qian, Eric K.; Young Chung, Duck; Kanatzidis, Mercouri G.; Phatak, Charudatta; Ma, Xuedan

doi:10.1021/acs.nanolett.3c03923

Title: Raman Shifts in Two-Dimensional van der Waals Magnets Reveal Magnetic Texture Evolution

Journal Article · 29 January 2024 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.3c03923 · OSTI ID:2519230

Huang, Zhengjie ^[1]; McCray, Arthur C. ^[2];

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^[4]; Young Chung, Duck ^[3];

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Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
Argonne National Laboratory (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM); Univ. of Chicago, IL (United States); Northwestern Univ., Evanston, IL (United States)

Two-dimensional (2D) van der Waals magnets comprise rich physics that can be exploited for spintronic applications. We investigate the interplay between spin-phonon coupling and spin textures in a 2D van der Waals magnet by combining magneto-Raman spectroscopy with cryogenic Lorentz transmission electron microscopy. Here we find that when stable skyrmion bubbles are formed in the 2D magnet, a field-dependent Raman shift can be observed, and this shift is absent for the 2D magnet prepared in its ferromagnetic state. Correlating these observations with numerical simulations that take into account field-dependent magnetic textures and spin--phonon coupling in the 2D magnet, we associate the Raman shift to field-induced modulations of the skyrmion bubbles and derive the existence of inhomogeneity in the skyrmion textures over the film thickness.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2519230

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 5 Vol. 24; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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