Spin caloritronics in two-dimensional CrI3/NiCl2 van der Waals heterostructures

Strain-tunable magnetic and electronic properties of a CuCl3 monolayer

“…The obtained lattice constant of the CrI 3 monolayer is 6.96 Å, the Cr–I bond length is 2.76 Å, and the Cr–I–Cr bond angle is 93.6°, which agree well with the experimental values 29 and other DFT results. 10,23–25 It is worth noting that the axial angle θ 2 between the Cu ion and two opposing Cl ligands within the same octahedron as shown in Fig. 1(a) is equal to 173.6°, which suggests some deformation in the octahedral environment since the axial angle is slightly smaller than 180°.…”

“…For example, the magnetic configurations of CrI 3 /NiCl 2 vdW heterostructures could be converted to a ferromagnetic (FM), an antiferromagnetic (AFM), and even a bipolar magnetic semiconducting state via an external electric field. 23 It is worth noting that the strain effect induced by lattice mismatch was not considered and the above results are concluded from the assumption of a robust ferromagnetic ground state of CrI 3 . However, in two recent works, monolayer CrI 3 has been reported to undergo a transition from the FM to the AFM state under the compression when the spin–orbit coupling effect is considered while under the tension with a collinear spin configuration.…”

Perfect spin Seebeck effect, spin-valve, spin-filter and spin-rectification based on the heterojunction of sawtooth graphene and graphyne nanoribbons

“…This new type of electronics concerning the interplay of spin and charge transport is called spintronics, 1–4 while the one focusing on heat and spin transport is called spin caloritronics. 5–8 A notable phenomenon of spin caloritronics is the spin Seebeck effect (SSE), 9–12 which can generate net spin current from the temperature gradient, and can decrease the dissipation heat caused by the total charge current. Meanwhile, a lot of spintronic effects such as the spin-filter, 13 spin-valve, 14 spin rectification, 15 magnetoresistance 16 and NDR effect 17 have been utilized to produce next-generation electronic devices.…”

Strain-induced spin-gapless semiconductors and pure thermal spin-current in magnetic black arsenic-phosphorus monolayers

“…Scientists have confirmed the SSE in many magnetic 2D monolayers, but their charge-current is too large to be cancelled to reduce the Joule heat in these nanodevices. 21–25 Moreover, the large on–off temperatures in them limit the practical device applications due to the paramagnetic transition caused by their low Curie temperatures ( T c ). The two main challenges mentioned above drive us to search for novel 2D magnetic materials with low charge-current and low on–off temperatures towards fast and dissipationless transport in practical spin-caloritronic devices.…”