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Communication Dans Un Congrès Année : 2021

Spin-orbit torques in topological insulator / two-dimensional ferromagnet heterostructures

Résumé

Topological insulators (TI) have gained much interest in the field of spintronics for the generation of pure spin currents. Indeed, three-dimensional TIs are predicted to host exotic properties like topologically protected surface states (TSS), which show Dirac-like band dispersion and spin-momentum locking [1]. One of the main strategies is to take advantages of the spin polarization of the TSSs to manipulate the magnetization of an adjacent ferromagnetic thin film (FM) using the spin-orbit torque (SOT) mechanism [2]. In the past few years, the community attempted to replace the traditional heavy metals by a TI in order to enhance the SOT efficiency with limited success. It now appears that the interface sharpness and the high chemical affinity between Bi-based TIs and classical 3d FMs is a major hurdle to reach the predicted breakthrough in magnetization switching power-efficiency [3]. The emergence of ferromagnetism in two dimensions in 2017, which started a new field in condensed matter physics, could bring a solution to this issue.The van der Waals (vdW) nature of the interaction between the TI and the 2D-FM should limit chemical reactions, interface intermixing and hybridization of state between the two layers.
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Dates et versions

hal-03549092 , version 1 (31-01-2022)

Identifiants

Citer

Thomas Guillet, Giulio Gentille, Regina Galceran, Juan Sierra, Marius Costache, et al.. Spin-orbit torques in topological insulator / two-dimensional ferromagnet heterostructures. Spintronics XIV, Aug 2021, San Diego, France. pp.104, ⟨10.1117/12.2604383⟩. ⟨hal-03549092⟩
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