Engineering elliptical spin-excitations by complex anisotropy fields in Fe adatoms and dimers on Cu(111)

Abstract

We investigate the dynamics of Fe adatoms and dimers deposited on the Cu(111) metallic surface in the presence of spin-orbit coupling, within time-dependent density functional theory. The \textit{ab initio} results provide material-dependent parameters that can be used in semiclassical approaches, which are used for insightful interpretations of the excitation modes. By manipulating the surroundings of the magnetic elements, we show that elliptical precessional motion may be induced through the modification of the magnetic anisotropy energy. We also demonstrate how different kinds of spin precession are realized, considering the symmetry of the magnetic anisotropy energy, the ferro- or antiferromagnetic nature of the exchange coupling between the impurities, and the strength of the magnetic damping. In particular, the normal modes of a dimer depend on the initial magnetic configuration, changing drastically by going from a ferromagnetic metastable state to the antiferromagnetic ground state. By taking into account the effect of the damping into their resonant frequencies, we reveal that an important contribution arises for strongly biaxial systems and specially for the antiferromagnetic dimers with large exchange couplings. Counter intuitively, our results indicate that the magnetic damping influences the quantum fluctuations by decreasing the zero-point energy of the system.

References in corpus (32)

• Antiferromagnetic spintronics
• Enhanced Gilbert Damping in Thin Ferromagnetic Films
• Reading and Writing Single-Atom Magnets
• Switching of Perpendicularly Polarized Nanomagnets with Spin Orbit Torque without an External Magnetic Field by Engineering a Tilted Anisotropy
• Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
• Theory of single spin inelastic tunneling spectroscopy
• Control of single-spin magnetic anisotropy by exchange coupling
• Spin wave imaging in atomically designed nanomagnets
• Atomistic spin dynamic method with both damping and moment of inertia effects included from first principles
• Exchange interaction parameters and adiabatic spin-wave spectra of ferromagnets: A "renormalized magnetic force theorem"
• Local control of single atom magneto-crystalline anisotropy
• Quantum Engineering of Spin and Anisotropy in Magnetic Molecular Junctions
• Spin Inelastic Electron Tunneling Spectroscopy on Local Spin Adsorbed on Surface
• Magnetic susceptibility, exchange interactions and spin-wave spectra in the local spin density approximation
• The exchange coupling and spin waves in metallic magnets: removal of the long-wave approximation
• Probing Magnetic Excitations and Correlations in Single and Coupled Spin Systems with Scanning Tunneling Spectroscopy
• Theory of Inelastic Electron Tunneling from a Localized Spin in the Impulsive Approximation
• Dynamical magnetic excitations of nanostructures from first-principles
• Theory of Local Dynamical Magnetic Susceptibilities from the Korringa-Kohn-Rostoker Green Function Method
• Relativistic dynamical spin excitations of magnetic adatoms
• Transverse dynamical magnetic susceptibilities from regular static density functional theory: Evaluation of damping and g-shifts of spin-excitations
• Parity effect in ground state localization of antiferromagnetic chains coupled to a ferromagnet
• Non-equilibrium current and noise in inelastic tunneling through a magnetic atom
• Renormalization of electron self-energies via their interaction with spin excitations: A first-principles investigation
• Anomalously large g-factor of single atoms adsorbed on a metal substrate
• Zero-point spin-fluctuations of single adatoms
• Life times and chirality of spin-waves in antiferromagnetic and ferromagnetic FeRh: time depedent density functional theory perspective
• Carbon nanotube: a low-loss spin-current waveguide
• Dynamical current-induced ferromagnetic and antiferromagnetic resonances
• Tuning paramagnetic spin-excitations of single adatoms
• Theoretical probing of inelastic spin-excitations in adatoms on surfaces
• Atomic-Scale Magnetometry of Dynamic Magnetization

Cited by in corpus (5)

• Effective damping enhancement in noncollinear spin structures
• Zero-point quantum swing of magnetic couples
• Spin dynamics of $3d$ and $4d$ impurities embedded in prototypical topological insulators
• Spin-fluctuation and spin-relaxation effects of single adatoms from first principles
• Generalization of the Landau-Lifshitz-Gilbert equation by multi-body contributions to Gilbert damping for non-collinear magnets