Strain-mediated ferromagnetism and low-field magnetic reversal in Co doped monolayer WS2

Jena, A.K. and Sahoo, A.K. and Mohanty, J. and et al, . (2022) Strain-mediated ferromagnetism and low-field magnetic reversal in Co doped monolayer WS2. Scientific Reports, 12 (1). pp. 1-12. ISSN 2045-2322

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Abstract

Strain-mediated magnetism in 2D materials and dilute magnetic semiconductors hold multi-functional applications for future nano-electronics. Herein, First principles calculations are employed to study the influence of biaxial strain on the magnetic properties of Co-doped monolayer WS2. The non-magnetic WS2 shows ferromagnetic signature upon Co doping due to spin polarization, which is further improved at low compressive (-2 %) and tensile (+2 %) strains. From the PDOS and spin density analysis, the opposite magnetic ordering is found to be favourable under the application of compressive and tensile strains. The double exchange interaction and p-d hybridization mechanisms make Co-doped WS2 a potential host for magnetism. More importantly, the competition between exchange and crystal field splittings, i.e. (Δ ex> Δ cfs), of the Co-atom play pivotal roles in deciding the values of the magnetic moments under applied strain. Micromagnetic simulation reveals, the ferromagnetic behavior calculated from DFT exhibits low-field magnetic reversal (190 Oe). Moreover, the spins of Co-doped WS2 are slightly tilted from the easy axis orientations showing slanted ferromagnetic hysteresis loop. The ferromagnetic nature of Co-doped WS2 suppresses beyond ±2% strain, which is reflected in terms of decrease in the coercivity in the micromagnetic simulation. The understanding of low-field magnetic reversal and spin orientations in Co-doped WS2 may pave the way for next-generation spintronics and straintronics applications. © 2022, The Author(s).

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IITH Creators:
IITH CreatorsORCiD
Mohanty, Jyoti Ranjanhttps://orcid.org/0000-0001-9579-754X
Item Type: Article
Uncontrolled Keywords: Electric Field; Tunnel Junctions; Lead Titanates
Subjects: Physics
Physics > Magnetism
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 17 Jun 2022 06:14
Last Modified: 17 Jun 2022 06:17
URI: http://raiith.iith.ac.in/id/eprint/9300
Publisher URL: https://doi.org/10.1038/s41598-022-06346-w
OA policy: https://v2.sherpa.ac.uk/id/publication/24229
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