Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr2Ge2Te6

Han, Myung-Geun; Garlow, Joseph A.; Liu, Yu; Zhang, Huiqin; Li, Jun; DiMarzio, Donald; Knight, Mark W.; Petrovic, Cedomir; Jariwala, Deep; Zhu, Yimei

doi:10.1021/acs.nanolett.9b02849

Title: Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr₂Ge₂Te₆

Journal Article · Tue Oct 29 00:00:00 EDT 2019 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.9b02849· OSTI ID:1580243

^[1]; Garlow, Joseph A. ^[2];

^[1]; Zhang, Huiqin ^[3]; Li, Jun ^[1]; DiMarzio, Donald ^[4];

^[4];

^[1];

^[3];

^[2]

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)

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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0012704; AC02-98CH10886

OSTI ID:: 1580243

Report Number(s):: BNL-212475-2019-JAAM; TRN: US2102210

Journal Information:: Nano Letters, Vol. 19, Issue 11; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 71 works

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Title: Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr2Ge2Te6

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Title: Topological Magnetic-Spin Textures in Two-Dimensional van der Waals Cr₂Ge₂Te₆