Angular Momentum Conservation and Phonon Spin in Magnetic Insulators

Abstract

We develop a microscopic theory of spin-lattice interactions in magnetic insulators, separating rigid-body rotations and the internal angular momentum, or spin, of the phonons, while conserving the total angular momentum. In the low-energy limit, the microscopic couplings are mapped onto experimentally accessible magnetoelastic constants. We show that the transient phonon spin contribution of the excited system can dominate over the magnon spin, leading to nontrivial Einstein-de Haas physics.

16 pages, 6 figures

References in corpus (7)

• Spin Seebeck insulator
• Theory of magnon-driven spin Seebeck effect
• Magnon Polarons in the Spin Seebeck Effect
• Orbital magnetic moments of phonons
• Magnon-phonon interactions in magnetic insulators
• Nanomechanical Detection of Itinerant Electron Spin Flip
• Electromechanical Magnetization Switching

Cited by in corpus (9)

• Spin Insulatronics
• Terahertz-Light Driven Coupling of Antiferromagnetic Spins to Lattice
• Chiral phonons in honeycomb sublattice of layered CoSn-like compounds
• Sum-frequency excitation of coherent magnons
• The Einstein - de Haas effect at radio frequencies in and near magnetic equilibrium
• Calculating spin-lattice interactions in ferro- and antiferromagnets: the role of symmetry, dimension and frustration
• Conservation of Angular Momentum in the Elastic Medium with Spins
• Optically- and thermally-driven huge lattice orbital and spin angular momenta from spinning fullerenes
• An Effective Field Theory of Magneto-Elasticity