Identifying Strain Stacking Boundaries between Multiphase Domains in Atomically Thin Two-Dimensional Magnets

Bhusal, Hem Prasad [University of California, Santa Cruz, CA (United States)] (ORCID:0009000319033312); Tanaka, Koichi [University of California, Santa Cruz, CA (United States)] (ORCID:0000000231807881); Zeltmann, Steven [University of California, Berkeley, CA (United States)]; Hanley, Chris [University at Buffalo, NY (United States)]; Ophus, Colin [Stanford University, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry]; Bustillo, Karen C. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry] (ORCID:0000000220966078); Ribet, Stephanie M. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry] (ORCID:000000027117066X); Gonzalez, Carlos A. [University of California, Santa Cruz, CA (United States)]; Zhen, Belinda [University of California, Santa Cruz, CA (United States)]; Ciston, Jim [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry]; Ge, Zhehao [University of California, Santa Cruz, CA (United States)]; Lashley, Jason C. [Savannah River National Laboratory (SRNL), Jackson, SC (United States)]; Zettl, Alex K. [University of California, Berkeley, CA (United States)]; Velasco, Jr., Jairo [University of California, Santa Cruz, CA (United States)] (ORCID:0000000234931095); Chen, Wei [University at Buffalo, NY (United States)] (ORCID:0000000211357721); Yan, Aiming [University of California, Santa Cruz, CA (United States)] (ORCID:0000000253947498)

doi:10.1021/acsnano.5c14666

DOE OSTI · 3391120

Identifying Strain Stacking Boundaries between Multiphase Domains in Atomically Thin Two-Dimensional Magnets

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Abstract

Stacking engineering of van der Waals materials is an important strategy to control the materials’ properties, such as electronic correlations, ferroelectricity, and layer-dependent two-dimensional magnetism. A timely testbed for the study of the latter is atomically thin chromium trihalides (CrX 3 , X = Cl, Br, I). Notably, by understanding the sliding mechanism between different stacking sequences, control of the stacking arrangement, and thus magnetic properties in CrX 3 , can be achieved. Such insight, however, is currently lacking. Here, in this study, advanced electron microscopy methods are used to identify multiple stacking sequences corresponding to different bulk phases in atomically thin CrX 3 (X = Cl and Br) down to bilayer thickness and with lateral domain sizes as small as tens of nanometers. Indications of nanometer scale transitions and interactions at the stacking boundaries are found, including a universally preferred sliding direction that is consistent with density functional theory calculations and the strain fields at lateral heterostructure boundaries. This study demonstrates the necessity to consider local stacking structures when interpreting averaged magnetic properties measured with macroscale probes. Additionally, the preferred sliding direction insight from this study provides a strategy to control stacking sequence in atomically thin CrX 3 samples during the exfoliation and sample fabrication process.

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DFT calculations four-dimensional scanning transmission electron microscopy magnetic properties stacking engineering two-dimensional magnetism

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Bhusal, Hem Prasad [University of California, Santa Cruz, CA (United States)] (ORCID:0009000319033312), Tanaka, Koichi [University of California, Santa Cruz, CA (United States)] (ORCID:0000000231807881), Zeltmann, Steven [University of California, Berkeley, CA (United States)], Hanley, Chris [University at Buffalo, NY (United States)], Ophus, Colin [Stanford University, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry], Bustillo, Karen C. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry] (ORCID:0000000220966078), Ribet, Stephanie M. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry] (ORCID:000000027117066X), Gonzalez, Carlos A. [University of California, Santa Cruz, CA (United States)], Zhen, Belinda [University of California, Santa Cruz, CA (United States)], Ciston, Jim [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry], Ge, Zhehao [University of California, Santa Cruz, CA (United States)], Lashley, Jason C. [Savannah River National Laboratory (SRNL), Jackson, SC (United States)], Zettl, Alex K. [University of California, Berkeley, CA (United States)], Velasco, Jr., Jairo [University of California, Santa Cruz, CA (United States)] (ORCID:0000000234931095), Chen, Wei [University at Buffalo, NY (United States)] (ORCID:0000000211357721), Yan, Aiming [University of California, Santa Cruz, CA (United States)] (ORCID:0000000253947498). 2026-03-06. Identifying Strain Stacking Boundaries between Multiphase Domains in Atomically Thin Two-Dimensional Magnets. https://doi.org/10.1021/acsnano.5c14666

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