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[1] Yi Wang et al., Magnetization switching by magnon-mediated spin torque through an antiferromagnetic insulator, Science 366, 1125-1128 (2019)
DOI: 10.1126/science.aav8076
[2] Yi Wang et al., Room temperature magnetization switching in topological insulator-ferromagnet heterostructures by spin-orbit torques, Nature Communications 8, 1364 (2017)
DOI: 10.1038/s41467-017-01583-4
[3] Yi Wang et al., Room-Temperature Giant Charge-to-Spin Conversion at the SrTiO3¨CLaAlO3 Oxide Interface, Nano Letters 17, 7659 (2017)
DOI: 10.1021/acs.nanolett.7b03714
[4] Yi Wang et al., Topological Surface States Originated Spin-Orbit Torques in Bi2Se3£¬Physical Review Letters 114, 257202 (2015)
DOI:
