Significant enhancement of magnetic anisotropy and conductivity in GaN/CrI3 van der Waals heterostructures via electrostatic doping

Enhanced Curie temperature and conductivity of van der Waals ferromagnet MgV2S4via electrostatic doping

“…Since the mean-field approximation overestimates the temperature, we use Monte Carlo simulations based on the Heisenberg model to predict T c . The spin Hamiltonian is given by 37 where J is the exchange constant, S m and S n are the spin vectors of m and n sites, A is the anisotropy energy and S z m is the spin component of the site m along the easy magnetization axis. Thus, the unit cell energies of FM, AFM-1, and AFM-2 states can be written as E FM = E 0 − 6 J 1 | S | 2 − 3 J 2 | S | 2 − A | S | 2 E AFM−1 = E 0 + 2 J 1 | S | 2 + J 2 | S | 2 − A | S | 2 E AFM−2 = E 0 − 6 J 1 | S | 2 + 3 J 2 | S | 2 − A | S | 2 in which J 1 and J 2 are intralayer nearest-neighbour (NN) coupling constants and interlayer NN coupling constants as plotted in Fig.…”

“…The same phenomenon is also observed in VSe 2 49 and CrI 3 . 37 In contrast to hole doping, the increase of electron doping concentration causes a steady rise in J 2 and slight change in J 1 . It is obvious that doping can strengthen the FM coupling of the MgV 2 S 4 monolayer.…”

Structural distortion induced Dzyaloshinskii–Moriya interaction in monolayer CrI3 at heterostructures

“…We can find there is considerable difference between bottom and upper Cr-I bonds, and the largest difference is 0.13 Å in CrI 3 /Ir(111), indicating remarkable structural distortion in CrI 3 layer. This is different to the 2D substrates, on which the CrI 3 layer undergoes negligible deformation [26][27][28]. To evaluate the interlayer interaction, adsorption energies E ad are calculated by…”

Effects of p–d orbital mixings on magnetocrystalline anisotropy for D3d-symmetric ferromagnetic semiconducting monolayers

“…4–6 MA also affects the magnetic configuration of 2D magnets 7–9 and the performance of nanoscale devices. 10,11 For example, an increased magnetocrystalline anisotropy (MCA) can transform the configuration of Fe 3 Sn 2 sheets from skyrmion bubbles to biskyrmion-like. 9 Regarding magnetic storage, MCA determines the energy consumption in the writing process and the information stability.…”