Electron-Magnon Scattering in Magnetic Heterostructures Far Out-of-Equilibrium

Abstract

We present a theory of out-of-equilibrium ultrafast spin dynamics in magnetic heterostructures based on the s-d model of ferromagnetism. Both in the bulk and across interfaces, the exchange processes between the itinerant s and the localized d electrons are described by kinetic rate equations for electron-magnon spin-flop scattering. The principal channel for dissipation of angular momentum is provided by spin relaxation of the itinerant electrons. Our theory extends interfacial spin phenomena such as torques, pumping, and the Peltier and Seebeck effects to address laser-induced rapid spin dynamics, in which the effective electron temperature may approach or even exceed the Curie temperature.

4 pages, 3 figures

References in corpus (9)

• Spin Seebeck insulator
• Theory of magnon-driven spin Seebeck effect
• Thermal Spin-Transfer Torques in Magnetoelectronic Devices
• Interface enhancement of Gilbert damping from first-principles
• Landau-Lifshitz theory of the longitudinal spin Seebeck effect
• Two magnon bound state causes ultrafast thermally induced magnetisation switching
• Interfacial Spin and Heat Transfer between Metals and Magnetic Insulators
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• Thermodynamic transport theory of spin waves in ferromagnetic insulators
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• Ultrafast demagnetization in ferromagnetic materials: Origins and progress
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• Ultrafast Spin Accumulations Drive Magnetization Reversal in Multilayers
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• Probing Laser-Induced Spin-Current Generation in Synthetic Ferrimagnets Using Spin Waves
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