Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr2Ge2Te6
Abstract
Two-dimensional (2D) van der Waals (vdW) materials show a range of profound physical properties that can be tailored through their incorporation in heterostructures and manipulated with external forces. The recent discovery of long-range ferromagnetic order down to atomic layers provides an additional degree of freedom in engineering 2D materials and their heterostructure devices for spintronics, valleytronics, and magnetic tunnel junction switches. In this work, using direct imaging by cryo-Lorentz transmission electron microscopy we show that topologically nontrivial magnetic-spin states, skyrmionic bubbles, can be realized in exfoliated insulating 2D vdW Cr2Ge2Te6. Due to the competition between dipolar interactions and uniaxial magnetic anisotropy, hexagonally packed nanoscale bubble lattices emerge by field cooling with magnetic field applied along the out-of-plane direction. Despite a range of topological spin textures in stripe domains arising due to pair formation and annihilation of Bloch lines, bubble lattices with single chirality are prevalent. In conclusion, our observation of topologically nontrivial homochiral skyrmionic bubbles in exfoliated vdW materials provides a new avenue for novel quantum states in atomically thin insulators for magneto-electronic and quantum devices.
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- NG Next, Northrop Grumman Corporation, Redondo Beach, CA (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1580243
- Report Number(s):
- BNL-212475-2019-JAAM
Journal ID: ISSN 1530-6984; TRN: US2102210
- Grant/Contract Number:
- SC0012704; AC02-98CH10886
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 19; Journal Issue: 11; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; van der Waals; topological; two-dimensional; ferromagnetism; Skyrmions; spintronics; Lorentz microscopy; Dzyaloshinskii-Moriya
Citation Formats
Han, Myung-Geun, Garlow, Joseph A., Liu, Yu, Zhang, Huiqin, Li, Jun, DiMarzio, Donald, Knight, Mark W., Petrovic, Cedomir, Jariwala, Deep, and Zhu, Yimei. Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr2Ge2Te6. United States: N. p., 2019.
Web. doi:10.1021/acs.nanolett.9b02849.
Han, Myung-Geun, Garlow, Joseph A., Liu, Yu, Zhang, Huiqin, Li, Jun, DiMarzio, Donald, Knight, Mark W., Petrovic, Cedomir, Jariwala, Deep, & Zhu, Yimei. Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr2Ge2Te6. United States. https://doi.org/10.1021/acs.nanolett.9b02849
Han, Myung-Geun, Garlow, Joseph A., Liu, Yu, Zhang, Huiqin, Li, Jun, DiMarzio, Donald, Knight, Mark W., Petrovic, Cedomir, Jariwala, Deep, and Zhu, Yimei. Tue .
"Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr2Ge2Te6". United States. https://doi.org/10.1021/acs.nanolett.9b02849. https://www.osti.gov/servlets/purl/1580243.
@article{osti_1580243,
title = {Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr2Ge2Te6},
author = {Han, Myung-Geun and Garlow, Joseph A. and Liu, Yu and Zhang, Huiqin and Li, Jun and DiMarzio, Donald and Knight, Mark W. and Petrovic, Cedomir and Jariwala, Deep and Zhu, Yimei},
abstractNote = {Two-dimensional (2D) van der Waals (vdW) materials show a range of profound physical properties that can be tailored through their incorporation in heterostructures and manipulated with external forces. The recent discovery of long-range ferromagnetic order down to atomic layers provides an additional degree of freedom in engineering 2D materials and their heterostructure devices for spintronics, valleytronics, and magnetic tunnel junction switches. In this work, using direct imaging by cryo-Lorentz transmission electron microscopy we show that topologically nontrivial magnetic-spin states, skyrmionic bubbles, can be realized in exfoliated insulating 2D vdW Cr2Ge2Te6. Due to the competition between dipolar interactions and uniaxial magnetic anisotropy, hexagonally packed nanoscale bubble lattices emerge by field cooling with magnetic field applied along the out-of-plane direction. Despite a range of topological spin textures in stripe domains arising due to pair formation and annihilation of Bloch lines, bubble lattices with single chirality are prevalent. In conclusion, our observation of topologically nontrivial homochiral skyrmionic bubbles in exfoliated vdW materials provides a new avenue for novel quantum states in atomically thin insulators for magneto-electronic and quantum devices.},
doi = {10.1021/acs.nanolett.9b02849},
journal = {Nano Letters},
number = 11,
volume = 19,
place = {United States},
year = {Tue Oct 29 00:00:00 EDT 2019},
month = {Tue Oct 29 00:00:00 EDT 2019}
}
Web of Science
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