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

Abstract

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

References in corpus (2)

• Angular Momentum Conservation and Phonon Spin in Magnetic Insulators
• Conversion between electron spin and microscopic atomic rotation

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• Orbital Pumping Incorporating Both Orbital Angular Momentum and Position
• From Elastic Spin to Phonon Spin: Symmetry and Fundamental Relations
• Spatiotemporal visualization of a surface acoustic wave coupled to magnons across a submillimeter-long sample by pulsed laser interferometry
• Magnon-phonon coupling of synthetic antiferromagnets in a surface acoustic wave cavity resonator
• Magnetic switching of phonon angular momentum in a ferrimagnetic insulator
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• Acoustic Frequency Multiplication and Pure Second Harmonic Generation of Phonons by Magnetic Transducers
• Divergent phonon angular momentum driven by temperature and strain
• Manipulation of magnetic systems by quantized surface acoustic wave via piezomagnetic effect
• Inelastic Neutron Scattering for Direct Detection of Chiral Phonons