Abstract
Two-dimensional van der Waals (vdW) heterostructures have recently emerged as attractive candidates to work as spintronic and optoelectronic devices. Here, two types of magnetic vdW heterostructures are constructed to design spin caloritronic devices. The first-principles calculations uncover that the magnetic configurations of vdW heterostructures can be converted easily to a ferromagnetic, an antiferromagnetic, and even a bipolar magnetic semiconducting state by an external electric field. More interestingly, two thermal spin-dependent currents with opposite spin orientations can be driven by a temperature gradient to flow in opposite transport directions independently in the different layers of vdW heterostructures, demonstrating that the vdW heterostructures can exhibit a nearly perfect thermal spin-filtering effect in each layer while generating a well-defined spin-Seebeck effect in the whole system. Our work puts forward a class of material candidates to design spin caloritronic devices characterized by multiple inspiring thermal-spin transport behaviors.
- Received 1 September 2020
- Revised 1 January 2021
- Accepted 26 February 2021
DOI:https://doi.org/10.1103/PhysRevB.103.115415
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