Effective damping enhancement in noncollinear spin structures

Gilbert damping in noncollinear ferromagnets.

The precession and damping of a collinear magnetization displaced from its equilibrium are well described by the Landau-Lifshitz-Gilbert equation. The theoretical and experimental complexity of noncollinear magnetizations is such that it is not known how the damping is modified by the noncollinearity. We use first-principles scattering theory to investigate transverse domain walls (DWs) of the ...

Ultrafast laser-induced dynamics of noncollinear spin structures in amorphous NdFeCo and PrFeCo

Transverse spin-gradient functional for noncollinear spin-density-functional theory.

We present a novel functional for spin-density-functional theory aiming at the description of noncollinear magnetic structures. The construction of the functional employs the spin-spiral-wave state of the uniform electron gas as reference system. We show that the functional depends on transverse gradients of the spin magnetization; i.e., in contrast with the widely used local spin density appro...

Thermoelectric spin accumulation and long-time spin precession in a noncollinear quantum dot spin valve

We explore thermoelectric spin transport and spin dependent phenomena in a noncollinear quantum dot spin valve setup. Using this setup, we demonstrate the possibility of a thermoelectric excitation of single spin dynamics inside the quantum dot. Many-body exchange fields generated on the single spins in this setup manifest as effective magnetic fields acting on the net spin accumulation in the ...

Multicritical behavior in frustrated spin systems with noncollinear order

We investigate the phase diagram and, in particular, the nature of the the multicritical point in three-dimensional frustrated N -component spin models with noncollinear order in the presence of an external field, for instance easyaxis stacked triangular antiferromagnets in the presence of a magnetic field along the easy axis. For this purpose we study the renormalization-group flow in a Landau...