Young-Gwan CHOI
The orbital angular momentum is a core ingredient of orbital magnetism, spin Hall effect, giant Rashba spin splitting, orbital Edelstein effect, and spin-orbit torque. However, its experimental detection is tricky. In particular, direct detection of the orbital Hall effect remains elusive despite its importance for electrical control of magnetic nanodevices. Here we report the direct observation of the orbital Hall effect in a light metal Ti1. The Kerr rotation by the accumulated orbital magnetic moment is measured at Ti surfaces, whose result agrees with theoretical calculations semi-quantitatively. As another evidence, we measured the orbital torque in the Ti/Co heterostructures, from which we determine the orbital Hall angle >0.31. Our experimental results confirm the orbital Hall effect in a light metal Ti and hint at opportunities in the emerging field of orbitronics.
[1] Choi et al., Observation of the orbital Hall effect in a light metal Ti, arXiv:2109.14847.