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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 16138
School of Nano Science
  Title:   Strain and electric-field control of spin-spin interactions in monolayer CrI3
  Author(s): 
1 . Sahar Izadi
2 . Zahra Torbatian
3 . Alireza Qaiumzadeh
4 . Reza Asgari
  Status:   Submitted
  Journal:
  Year:  2020
  Supported by:  IPM
  Abstract:
We investigate the impact of mechanical strains and a perpendicular electric field on the electronic and magnetic ground-state properties of two-dimensional monolayer CrI3 using density functional theory. We propose a minimal spin model Hamiltonian, consisting of symmetric isotropic exchange interactions, magnetic anisotropy energy, and Dzyaloshinskii=Moriya (DM) interactions, to capture most pertinent magnetic properties of the system. We compute the mechanical strain and electric field dependence of various spin=spin interactions. Our results show that both the amplitudes and signs of the exchange interactions can be engineered by means of strain, while the electric field affects only their amplitudes. However, strain and electric fields affect both the directions and amplitudes of the DM vectors. The amplitude of the magnetic anisotropy energy can also be substantially modified by an applied strain. We show that in comparison with an electric field, strain can be more efficiently used to manipulate the magnetic and electronic properties of the system. Notably, such systematic tuning of the spin interactions is essential for the engineering of room-temperature spintronic nanodevices.

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