Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructures
Source abstract
Abstract
Spin-orbit coupling stands as a powerful tool to interconvert charge and spin currents and to manipulate the magnetization of magnetic materials through spin-torque phenomena. However, despite the diversity of existing bulk materials and the recent advent of interfacial and low-dimensional effects, control of this interconversion at room temperature remains elusive. Here, we demonstrate strongly enhanced room-temperature spin-to-charge interconversion in graphene driven by the proximity of WS2. By performing spin precession experiments in appropriately designed Hall bars, we separate the contributions of the spin Hall and the spin galvanic effects. Remarkably, their corresponding conversion efficiencies can be tailored by electrostatic gating in magnitude and sign, peaking near the charge neutrality point with an equivalent magnitude that is comparable to the largest efficiencies reported to date. Such electric-field tunability provides a building block for spin generation free from magnetic materials and for ultra-compact magnetic memory technologies.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Magnetic properties of thin films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (45)
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1. Sinova, J., Valenzuela, S. O., Wunderlich, J., Back, C. H. & Jungwirth, T. Spin Hall effects. Rev. Mod. Phys. 87, 1213 (2015).10.1103/RevModPhys.87.1213 ↗
2. Manchon, A., Koo, H. C., Nitta, J., Frolov, S. M. & Duine, R. A. New perspectives for Rashba spin–orbit coupling. Nat. Mater. 14, 871–882 (2015).10.1038/nmat4360 ↗
3. Soumyanarayanan, A., Reyren, N., Fert., A. & Panagopoulos, C. Emergent phenomena induced by spin–orbit coupling at surfaces and interfaces. Nature 539, 509–517 (2016).10.1038/nature19820 ↗
4. Sander, D. et al. The 2017 magnetism roadmap. J. Phys. D 50, 363001 (2017).10.1088/1361-6463/aa81a1 ↗
5. Garello, K. et al. SOT-MRAM 300MM integration for low power and ultrafast embedded memories. In Proc. 2018 IEEE Symposium on VLSI Circuits Digest of Technical Papers 81–82 (IEEE, 2018).10.1109/VLSIC.2018.8502269 ↗
6. Ganichev, S. D. et al. Spin-galvanic effect. Nature 417, 153–156 (2002).10.1038/417153a ↗
7. Valenzuela, S. O. & Tinkham, M. Direct electronic measurement of the spin Hall effect. Nature 442, 176–179 (2006).10.1038/nature04937 ↗
8. Manipatruni, S. et al. Scalable energy-efficient magnetoelectric spin–orbit logic. Nature 565, 35–42 (2019).10.1038/s41586-018-0770-2 ↗
9. Manchon, A. et al. Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems. Rev. Mod. Phys. 91, 035004 (2019).10.1103/RevModPhys.91.035004 ↗
10. Bibes, M. & Barthélémy, A. Oxide spintronics. IEEE Trans. Electron. Devices 54, 1003–1023 (2007).10.1109/TED.2007.894366 ↗
11. Geim, A. K. & Grigorieva, I. V. Van der Waals heterostructures. Nature 499, 419–425 (2013).10.1038/nature12385 ↗
12. Han, W., Kawakami, R. K., Gmitra, M. & Fabian, J. Graphene spintronics. Nat. Nanotech. 9, 794–807 (2014).10.1038/nnano.2014.214 ↗
13. Roche, S. et al. Graphene spintronics: the European flagship perspective. 2D Mater. 2, 030202 (2015).10.1088/2053-1583/2/3/030202 ↗
14. Novoselov, K. S., Mishchenko, A., Carvalho, A. & Castro Neto, A. H. 2D materials and van der Waals heterostructures. Science 353, aac9439 (2016).10.1126/science.aac9439 ↗
15. Wang, Z., Tang, C., Sachs, R., Barlas, Y. & Shi, J. Proximity-induced ferromagnetism in graphene revealed by the anomalous Hall effect on transition-metal dichalcogenides. Phys. Rev. Lett. 114, 016603 (2015).10.1103/PhysRevLett.114.016603 ↗
16. Leutenantsmeyer, J. C., Kaverzin, A. A., Wojtaszek, M. & van Wees, B. J. Proximity induced room temperature ferromagnetism in graphene probed with spin currents. 2D Mater. 4, 014001 (2017).10.1088/2053-1583/4/1/014001 ↗
17. Benítez, L. A. et al. Strongly anisotropic spin relaxation in graphene–transition metal dichalcogenide heterostructures at room temperature. Nat. Phys. 14, 303–308 (2018).10.1038/s41567-017-0019-2 ↗
18. Mendes, J. B. S. et al. Spin-current to charge-current conversion and magnetoresistance in a hybrid structure of graphene and yttrium iron garnet. Phys. Rev. Lett. 115, 226601 (2015).10.1103/PhysRevLett.115.226601 ↗
19. Dushenko, S. et al. Gate-tunable spin-charge conversion and the role of spin-orbit interaction in graphene. Phys. Rev. Lett. 116, 106602 (2016).10.1103/PhysRevLett.116.166102 ↗
20. Gmitra, M. & Fabian, J. Graphene on transition-metal dichalcogenides: a platform for proximity spin-orbit physics and optospintronics. Phys. Rev. B 92, 155403 (2015).10.1103/PhysRevB.92.155403 ↗
21. Gmitra, M., Kochan, D., Högl, P. & Fabian, J. Trivial and inverted Dirac bands and the emergence of quantum spin Hall states in graphene on transition-metal dichalcogenides. Phys. Rev. B 93, 155104 (2016).10.1103/PhysRevB.93.155104 ↗
22. Cummings, A. W., Garcia, J. H., Fabian, J. & Roche, S. Giant spin lifetime anisotropy in graphene induced by proximity effects. Phys. Rev. Lett. 119, 206601 (2017).10.1103/PhysRevLett.119.206601 ↗
23. Ghiasi, T. S., Ingla-Aynés, J., Kaverzin, A. A. & van Wees, B. J. Large proximity-induced spin lifetime anisotropy in transition-metal dichalcogenide/graphene heterostructures. Nano Lett. 17, 7528–7532 (2017).10.1021/acs.nanolett.7b03460 ↗
24. Garcia, J. H., Cummings, A. W. & Roche, S. Spin Hall effect and weak antilocalization in graphene/transition metal dichalcogenide heterostructures. Nano Lett. 17, 5078 (2017).10.1021/acs.nanolett.7b02364 ↗
25. Offidani, M., Milletarì, M., Raimondi, R. & Ferreira, A. Optimal charge-to-spin conversion in graphene on transition metal dichalcogenide. Phys. Rev. Lett. 119, 0196801 (2017).10.1103/PhysRevLett.119.196801 ↗
26. Milletarì, M., Offidani, M., Ferreira, A. & Raimondi, R. Covariant conservation laws and the spin Hall effect in Dirac-Rashba systems. Phys. Rev. Lett. 119, 246801 (2017).10.1103/PhysRevLett.119.246801 ↗
27. Avsar, A. et al. Spin–orbit proximity effect in graphene. Nat. Commun. 5, 4875 (2014).10.1038/ncomms5875 ↗
28. Kaverzin, A. A. & van Wees, B. J. Electron transport nonlocality in monolayer graphene modified with hydrogen silsesquioxane polymerization. Phys. Rev. B 91, 165412 (2015).10.1103/PhysRevB.91.165412 ↗
29. Wang, Y., Cai, X., Reutt-Robey, J. & Fuhrer, M. S. Neutral-current Hall effects in disordered graphene. Phys. Rev. B 92, 161411(R) (2015).10.1103/PhysRevB.92.161411 ↗
30. Van Tuan, D. et al. Spin Hall effect and origins of nonlocal resistance in adatom-decorated graphene. Phys. Rev. Lett. 117, 176602 (2016).10.1103/PhysRevLett.117.176602 ↗
31. Ribeiro, M., Power, S. R., Roche, S., Hueso, L. H. & Casanova, C. Scale-invariant large nonlocality in polycrystalline graphene. Nat. Commun. 8, 2198 (2017).10.1038/s41467-017-02346-x ↗
32. Safeer, C. K. et al. Room-temperature spin Hall effect in graphene/MoS2 van der Waals heterostructures. Nano Lett. 19, 1074–1082 (2019).10.1021/acs.nanolett.8b04368 ↗
33. Valenzuela, S. O. & Tinkham, M. Electrical detection of spin currents: the spin-current induced Hall effect. J. App. Phys. 101, 09B103 (2007).10.1063/1.2710794 ↗
34. Kimura, T., Otani, Y., Sato, T., Takahashi, S. & Maekawa, S. Room-temperature reversible spin Hall effect. Phys. Rev. Lett. 98, 156601 (2007).10.1103/PhysRevLett.98.156601 ↗
35. Savero Torres, W. et al. Spin precession and spin Hall effect in monolayer graphene/Pt nanostructures. 2D Mater. 4, 041008 (2017).10.1088/2053-1583/aa8823 ↗
36. Raes, B. et al. Determination of the spin-lifetime anisotropy in graphene using oblique spin precession. Nat. Commun. 7, 11444 (2016).10.1038/ncomms11444 ↗
37. Raes, B. et al. Spin precession in anisotropic media. Phys. Rev. B 95, 085403 (2017).10.1103/PhysRevB.95.085403 ↗
38. Yan, W. et al. A two-dimensional spin field-effect switch. Nat. Commun. 7, 13372 (2016).
39. Dankert, A. & Dash, S. P. Electrical gate control of spin current in van der Waals heterostructures at room temperature. Nat. Commun. 8, 16093 (2017).10.1038/ncomms16093 ↗
40. Rojas-Sánchez, J. C. et al. Spin-to-charge conversion using Rashba coupling at the interface between non-magnetic materials. Nat. Commun. 4, 1944 (2013).10.1038/ncomms2943 ↗
41. Lesne, E. et al. Highly efficient and tunable spin-to-charge conversion through Rashba coupling at oxide interfaces. Nat. Mater. 15, 1261 (2016).10.1038/nmat4726 ↗
42. Rojas-Sánchez, J.-C. et al. Spin to charge conversion at room temperature by spin pumping into a new type of topological insulator: α-Sn films. Phys. Rev. Lett. 116, 096602 (2016).10.1103/PhysRevLett.116.096602 ↗
43. Ghiasi, T. S., Kaverzin, A. A., Blah, P. J. & van Wees, B. J. Charge-to-spin conversion by the Rashba–Edelstein effect in 2D van der Waals heterostructures up to room temperature. Nano Lett. 19, 5959–5966 (2019).10.1021/acs.nanolett.9b01611 ↗
44. Ferreira, A., Rappoport, T. G., Cazalilla, M. A. & Castro Neto, A. H. Extrinsic spin Hall effect induced by resonant skew scattering in graphene. Phys. Rev. Lett. 112, 066601 (2014).10.1103/PhysRevLett.112.066601 ↗
45. Gebeyehu, Z. M. et al. Spin communication over 30 μm long channels of chemical vapor deposited graphene on SiO2. 2D Mater. 6, 034003 (2019).10.1088/2053-1583/ab1874 ↗