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The angular momentum interconversion between electron spin and other type ofangular momenta is useful to develop new spintronic functionalities. Theconversions from the angular momentum of photon and mechanical rotation toferromagnetic spin moment have been well studied. While the recent studiestheoretically suggested circular vibration of atoms works as angular momentumof phonon, the direct experimental demonstration of conversion to spin momentsremains to be performed. Here we demonstrate that the phonon angular momentumof surface acoustic wave can control the magnetization of a ferromagnetic Nifilm by means of the phononic-to-electronic conversion of angular momentum inNi/LiNbO$_3$ hybrid device. This result clearly shows the phonon angularmomentum is useful to further fictionalize spintronic devices.

Magnetization control by angular momentum transfer from surface acoustic wave to ferromagnetic spin moments