Publication detail

Stability of the In-Plane Room Temperature van der Waals Ferromagnet Chromium Ditelluride and Its Conversion to Chromium-Interleaved CrTe2 Compounds

PURBAWATI, A. SARKAR, S. PAIRIS, S. KOSTKA, M. HADJ-AZZEM, A. DUFEU, D. SINGH, P. BOURGAULT, D. NUNEZ-REGUEIRO, M. VOGEL, J. RENARD, J. MARTY, L. FABRE, F. FINCO, A. JACQUES, V. REN, L. TIWARI, V. ROBERT, C. MARIE, X. BENDIAB, N. ROUGEMAILLE, N. CORAUX, J.

Original Title

Stability of the In-Plane Room Temperature van der Waals Ferromagnet Chromium Ditelluride and Its Conversion to Chromium-Interleaved CrTe2 Compounds

Type

journal article in Web of Science

Language

English

Original Abstract

Van der Waals magnetic materials are building blocks for novel kinds of spintronic devices and playgrounds for exploring collective magnetic phenomena down to the two-dimensional limit. Chromium-tellurium compounds are relevant in this perspective. In particular, the 1T phase of CrTe2 has been argued to have a Curie temperature above 300 K, a rare and desirable property in the class of lamellar materials, making it a candidate for practical applications. However, recent literature reveals a strong variability in the reported properties, including magnetic ones. Using electron microscopy, diffraction, and spectroscopy techniques, together with local and macroscopic magnetometry approaches, our work sheds new light on the structural, chemical, and magnetic properties of bulk 1T-CrTe2 exfoliated in the form of flakes having a thickness ranging from few to several tens of nanometers. We unambiguously establish that 1T-CrTe2 flakes are ferromagnetic above room temperature, have an in-plane easy axis of magnetization, and low coercivity, and we confirm that their Raman spectroscopy signatures are two modes: E2g (103.5 cm-1) and A1g (136.5 cm-1). We also prove that thermal annealing causes a phase transformation to monoclinic Cr5Te8 and, to a lesser extent, to trigonal Cr5Te8. In sharp contrast with 1T-CrTe2, none of these compounds have a Curie temperature above room temperature, and they both have perpendicular magnetic anisotropy. Our findings reconcile the apparently conflicting reports in the literature and open opportunities for phase-engineered magnetic properties.

Keywords

van der Waals ferromagnet;stwo-dimensional material;sstability;room temperature ferromagnetism;CrTe2;Cr5Te8

Authors

PURBAWATI, A.; SARKAR, S.; PAIRIS, S.; KOSTKA, M.; HADJ-AZZEM, A.; DUFEU, D.; SINGH, P.; BOURGAULT, D.; NUNEZ-REGUEIRO, M.; VOGEL, J.; RENARD, J.; MARTY, L.; FABRE, F.; FINCO, A.; JACQUES, V.; REN, L.; TIWARI, V.; ROBERT, C.; MARIE, X.; BENDIAB, N.; ROUGEMAILLE, N.; CORAUX, J.

Released

28. 2. 2023

ISBN

2637-6113

Periodical

ACS Applied Electronic Materials

Year of study

5

Number

2

State

United States of America

Pages from

764

Pages to

774

Pages count

10

URL

https://pubs.acs.org/doi/10.1021/acsaelm.2c01256

BibTex

@article{BUT183256,
  author="PURBAWATI, A. and SARKAR, S. and PAIRIS, S. and KOSTKA, M. and HADJ-AZZEM, A. and DUFEU, D. and SINGH, P. and BOURGAULT, D. and NUNEZ-REGUEIRO, M. and VOGEL, J. and RENARD, J. and MARTY, L. and FABRE, F. and FINCO, A. and JACQUES, V. and REN, L. and TIWARI, V. and ROBERT, C. and MARIE, X. and BENDIAB, N. and ROUGEMAILLE, N. and CORAUX, J.",
  title="Stability of the In-Plane Room Temperature van der Waals Ferromagnet Chromium Ditelluride and Its Conversion to Chromium-Interleaved CrTe2 Compounds",
  journal="ACS Applied Electronic Materials",
  year="2023",
  volume="5",
  number="2",
  pages="764--774",
  doi="10.1021/acsaelm.2c01256",
  issn="2637-6113",
  url="https://pubs.acs.org/doi/10.1021/acsaelm.2c01256"
}