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Journal article
Surface-Engineered MXenes: Electric Field Control of Magnetism and Enhanced Magnetic Anisotropy
ACS nano, v 13(3), pp 2831-2839
26 Mar 2019
PMID: 30653916
Abstract
Controlling magnetism in two-dimensional (2D) materials via electric fields and doping enables robust long-range order by providing an external mechanism to modulate magnetic exchange interactions and anisotropy. In this report, we predict that transition metal carbide and nitride MXenes are promising candidates for controllable magnetic 2D materials. The surface terminations introduced during synthesis act as chemical dopants that influence the electronic structure, enabling controllable magnetic order. We show ground-state magnetic ordering in Janus M2XO x F2–x (M is an early transition metal, X is carbon or nitrogen, and x = 0.5, 1, or 1.5) with asymmetric surface functionalization, where local structural and chemical disorder induces magnetic ordering in some systems that are nonmagnetic or weakly magnetic in their pristine form. The resulting magnetic states of these noncentrosymmetric structures can be robustly switched and stabilized by tuning the interlayer exchange couplings with small applied electric fields. Furthermore, bond directionality is enhanced by Janus functionalization, resulting in improved magnetic anisotropy, which is essential to stable 2D magnetic ordering. The mixed termination-induced anisotropy leads to robust Ising ferromagnetism with an out-of-plane easy axis over the full range of relevant termination compositions for Janus Mn2N. Janus Cr2C, V2C, and Ti2C were found to be robustly antiferromagnetic. Our results provide a strategy for exploiting asymmetric surface functionalization to achieve room-temperature nanoscale magnetism under ambient conditions in MXenes with currently available synthesis techniques.
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Details
- Title
- Surface-Engineered MXenes: Electric Field Control of Magnetism and Enhanced Magnetic Anisotropy
- Creators
- Nathan C Frey - Department of Materials Science and EngineeringArkamita Bandyopadhyay - Department of Materials Science and EngineeringHemant Kumar - Department of Materials Science and EngineeringBabak Anasori - Department of Materials Science and Engineering, and A.J. Drexel Nanomaterials InstituteYury Gogotsi - Department of Materials Science and Engineering, and A.J. Drexel Nanomaterials InstituteVivek B Shenoy - Department of Materials Science and Engineering
- Publication Details
- ACS nano, v 13(3), pp 2831-2839
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000462950500012
- Scopus ID
- 2-s2.0-85060590890
- Other Identifier
- 991014969869904721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology