Orbital-excitation-dominated magnetization dissipation and quantum oscillation of Gilbert damping in Fe films

Abstract

Using first-principles electronic structure calculation, we demonstrate the spin dissipation process in bulk Fe by orbital excitations within the energy bands of pure spin character. The variation of orbitals in the intraband transitions provides an efficient channel to convert spin to orbital angular momentum with spin-orbit interaction. This mechanism dominates the Gilbert damping of Fe below room temperature. The theoretical prediction is confirmed by the ferromagnetic resonance experiment performed on single-crystal Fe(001) films. A significant thickness-dependent damping oscillation is found at low temperature induced by the quantum well states of the corresponding energy bands. Our findings not only explain the microscopic nature of the recently reported ultralow damping of Fe-based alloys, but also help for the understanding of the transport and dissipation process of orbital currents.

References in corpus (19)

• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Microscopic approach to current-driven domain wall dynamics
• Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
• Observation of the orbital Hall effect in a light metal Ti
• Interface enhancement of Gilbert damping from first-principles
• Observation of the Orbital Rashba-Edelstein Magnetoresistance
• Magneto-Optical Detection of the Orbital Hall Effect in Chromium
• Time-domain observation of ballistic orbital-angular-momentum currents with giant relaxation length in tungsten
• Thermal generation, manipulation and detection of skyrmions
• Giant anisotropy of Gilbert damping in epitaxial CoFe films
• Low relaxation rate in a low-Z alloy of iron
• Spin orbit precession damping in transition metal ferromagnets
• Orbital Hanle Magnetoresistance in a 3d Transition Metal
• Spin-dependent resonant tunneling through quantum-well states in magnetic metallic thin films
• Orbital relaxation length from first-principles scattering calculations
• Dyakonov-Perel-like Orbital and Spin Relaxations in Centrosymmetric Systems
• Strongly Enhanced Gilbert Damping in 3d Transition Metal Ferromagnet Monolayers in Contact with Topological Insulator Bi2Se3
• Anisotropic magnetization dynamics in Fe5GeTe2 at room temperature
• Magnetic damping anisotropy in the two-dimensional van der Waals material Fe${}_3$GeTe${}_2$ from first principles