Unconventional interlayer exchange coupling via chiral phonons in synthetic magnetic oxide heterostructures

Abstract

Chiral symmetry breaking of phonons plays an essential role in emergent quantum phenomena owing to its strong coupling to spin degree of freedom. However, direct experimental evidence of the chiral phonon-spin coupling is lacking. In this study, we report a chiral phonon-mediated interlayer exchange interaction in atomically controlled ferromagnetic metal (SrRuO3)-nonmagnetic insulator (SrTiO3) heterostructures. Owing to the unconventional interlayer exchange interaction, we have observed rotation of magnetic moments as a function of nonmagnetic insulating spacer thickness, resulting in a spin spiral state. The chiral phonon-spin coupling is further confirmed by phonon Zeeman effects. The existence of the chiral phonons and their interplay with spins along with our atomic-scale heterostructure approach open a window to unveil the crucial roles of chiral phonons in magnetic materials.

arXiv comment40 pages

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Cited by in corpus (20)

• Chiral phonons probed by X rays
• Large effective magnetic fields from chiral phonons in rare-earth halides
• Chiral Phonon Induced Spin-Polarization
• Giant effective magnetic moments of chiral phonons from orbit-lattice coupling
• Chirality-induced Phonon-Spin Conversion at an Interface
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• Electric field-induced nonreciprocal spin current due to chiral phonons in chiral-structure superconductors
• Exciton-activated effective phonon magnetic moment in monolayer MoS2
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• Atomic and Electronic Structures of Correlated SrRuO3/SrTiO3 Superlattices
• Theory of spin Seebeck effect activated by acoustic chiral phonons
• Chiral phonons in binary compounds $A$Bi ($A$ = K, Rb, Cs) with P2${}_1$/c structure
• Dimensionality Engineering of Magnetic Anisotropy from Anomalous Hall Effect in Synthetic SrRuO3 Crystals
• Phonon Edelstein effect in chiral metals
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• Supercurrent-induced phonon angular momentum
• Giant Magnetization Enhancement at Ultrathin Limit of an Orthoferrite