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Title: Ultrathin nanosheets of CrSiTe3. A semiconducting two-dimensional ferromagnetic material

Abstract

Finite range ferromagnetism and antiferromagnetism in two-dimensional (2D) systems within an isotropic Heisenberg model at non-zero temperature were originally proposed to be impossible. However, recent theoretical studies using an Ising model have recently shown that 2D magnetic crystals can exhibit magnetism. Experimental verification of existing 2D magnetic crystals in this system has remained elusive. In this work we for the first time exfoliate the CrSiTe3, a bulk ferromagnetic semiconductor, to mono- and few-layer 2D crystals onto a Si/SiO2 substrate. The Raman spectra show the good stability and high quality of the exfoliated flakes, consistent with the computed phonon spectra of 2D CrSiTe3, giving a strong evidence for the existence of 2D CrSiTe3 crystals. When the thickness of the CrSiTe3 crystals is reduced to few-layers, we observed a clear change in resistivity at 80~120 K, consistent with the theoretical calculations on the Curie temperature (Tc) of ~80 K for the magnetic ordering of 2D CrSiTe3 crystals. As a result, the ferromagnetic mono- and few-layer 2D CrSiTe3 indicated here should enable numerous applications in nano-spintronics.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [3];  [4];  [1];  [1];  [1];  [2];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Rensselaer Polytechnic Institute (RPI), Troy, NY (United States)
  4. Rensselaer Polytechnic Institute (RPI), Troy, NY (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1237632
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry C
Additional Journal Information:
Journal Volume: 4; Journal Issue: 2; Journal ID: ISSN 2050-7526
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Lin, Ming -Wei, Zhung, Houlong L., Yan, Jiaqiang, Ward, Thomas Zac, Puretzky, Alexander A., Rouleau, Christopher M., Gai, Zheng, Liang, Liangbo, Meunier, Vincent, Ganesh, Panchapakesan, Kent, Paul R. C., Sumpter, Bobby G., Mandrus, David G., Geohegan, David B., and Xiao, Kai. Ultrathin nanosheets of CrSiTe3. A semiconducting two-dimensional ferromagnetic material. United States: N. p., 2015. Web. doi:10.1039/C5TC03463A.
Lin, Ming -Wei, Zhung, Houlong L., Yan, Jiaqiang, Ward, Thomas Zac, Puretzky, Alexander A., Rouleau, Christopher M., Gai, Zheng, Liang, Liangbo, Meunier, Vincent, Ganesh, Panchapakesan, Kent, Paul R. C., Sumpter, Bobby G., Mandrus, David G., Geohegan, David B., & Xiao, Kai. Ultrathin nanosheets of CrSiTe3. A semiconducting two-dimensional ferromagnetic material. United States. https://doi.org/10.1039/C5TC03463A
Lin, Ming -Wei, Zhung, Houlong L., Yan, Jiaqiang, Ward, Thomas Zac, Puretzky, Alexander A., Rouleau, Christopher M., Gai, Zheng, Liang, Liangbo, Meunier, Vincent, Ganesh, Panchapakesan, Kent, Paul R. C., Sumpter, Bobby G., Mandrus, David G., Geohegan, David B., and Xiao, Kai. Fri . "Ultrathin nanosheets of CrSiTe3. A semiconducting two-dimensional ferromagnetic material". United States. https://doi.org/10.1039/C5TC03463A. https://www.osti.gov/servlets/purl/1237632.
@article{osti_1237632,
title = {Ultrathin nanosheets of CrSiTe3. A semiconducting two-dimensional ferromagnetic material},
author = {Lin, Ming -Wei and Zhung, Houlong L. and Yan, Jiaqiang and Ward, Thomas Zac and Puretzky, Alexander A. and Rouleau, Christopher M. and Gai, Zheng and Liang, Liangbo and Meunier, Vincent and Ganesh, Panchapakesan and Kent, Paul R. C. and Sumpter, Bobby G. and Mandrus, David G. and Geohegan, David B. and Xiao, Kai},
abstractNote = {Finite range ferromagnetism and antiferromagnetism in two-dimensional (2D) systems within an isotropic Heisenberg model at non-zero temperature were originally proposed to be impossible. However, recent theoretical studies using an Ising model have recently shown that 2D magnetic crystals can exhibit magnetism. Experimental verification of existing 2D magnetic crystals in this system has remained elusive. In this work we for the first time exfoliate the CrSiTe3, a bulk ferromagnetic semiconductor, to mono- and few-layer 2D crystals onto a Si/SiO2 substrate. The Raman spectra show the good stability and high quality of the exfoliated flakes, consistent with the computed phonon spectra of 2D CrSiTe3, giving a strong evidence for the existence of 2D CrSiTe3 crystals. When the thickness of the CrSiTe3 crystals is reduced to few-layers, we observed a clear change in resistivity at 80~120 K, consistent with the theoretical calculations on the Curie temperature (Tc) of ~80 K for the magnetic ordering of 2D CrSiTe3 crystals. As a result, the ferromagnetic mono- and few-layer 2D CrSiTe3 indicated here should enable numerous applications in nano-spintronics.},
doi = {10.1039/C5TC03463A},
journal = {Journal of Materials Chemistry C},
number = 2,
volume = 4,
place = {United States},
year = {Fri Nov 27 00:00:00 EST 2015},
month = {Fri Nov 27 00:00:00 EST 2015}
}

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