Two-Dimensional van der Waals Nanoplatelets with Robust Ferromagnetism

De Siena, Michael C.; Creutz, Sidney E.; Regan, Annie; Malinowski, S P.; Malinowski, S P.; Jiang, Qianni; Kluherz, Kyle; Zhu, Guomin; Lin, Zhong; De Yoreo, James J.; Xu, Xiaodong; Chu, Jiun-Haw; Gamelin, Daniel R.

doi:10.1021/acs.nanolett.0c00102

Two-Dimensional van der Waals Nanoplatelets with Robust Ferromagnetism

Journal Article · Wed Mar 11 04:00:00 EDT 2020 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.0c00102· OSTI ID:1783469

De Siena, Michael C. ^[1]; Creutz, Sidney E. ^[2]; Regan, Annie ^[3]; Malinowski, S P. ^[4]; Malinowski, S P. ^[4]; Jiang, Qianni ^[2]; Kluherz, Kyle ^[2]; Zhu, Guomin ^[2]; Lin, Zhong ^[2]; De Yoreo, James J. ^[5]; Xu, Xiaodong ^[2]; Chu, Jiun-Haw ^[2]; Gamelin, Daniel R. ^[2]

Northwestern University
University of Washington
Mississippi State University
University of Warsaw
BATTELLE (PACIFIC NW LAB)

We have synthesized unique colloidal nanoplatelets of the two-dimensional (2D) van der Waals ferromagnet CrI3 and have characterized these nanoplatelets structurally, magnetically, and by magnetic circular dichroism spectroscopy. The CrI3 nanoplatelets have lateral dimensions of ~25 nm and thicknesses of only ~4 nm, corresponding to just a few CrI3 monolayers. Magnetic and magneto-optical measurements demonstrate robust 2D ferromagnetic ordering with Curie temperatures similar to bulk CrI3, despite their small size. These data also show magnetization steps akin to those observed in micron-sized few-layer 2D sheets associated with concerted spin-reversal of individual CrI3 layers within few-layer van der Waals stacks. Similar data have also been obtained for CrBr3 and anion-alloyed Cr(I1–xBrx)3 nanoplatelets. These results represent the first example of lateral nanostructures of 2D van der Waals ferromagnets of any composition. The demonstration of robust ferromagnetism at nanometer lateral dimensions opens new doors for miniaturization in spintronics devices based on van der Waals ferromagnets.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1783469

Report Number(s):: PNNL-SA-162438

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 3 Vol. 20

Country of Publication:: United States

Language:: English

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