Mechanism of formating spin-wave-like excitations in a magnetic liquid

Magnetic excitations and anomalous spin-wave broadening in multiferroic FeV2O4

We report on the different roles of two orbital-active Fe 2+ at the A site and V 3+ at the B site in the magnetic exci-tations and on the anomalous spin-wave broadening in FeV 2 O 4. FeV 2 O 4 exhibits three structural transitions and successive paramagnetic (PM)–collinear ferrimagnetic (CFI)–noncollinear ferrimagnetic (NCFI)/ferroelectric transitions. The high-temperature tetragonal/PM–orthorh...

Nonlinear spin-wave excitations at low magnetic bias fields

Nonlinear magnetization dynamics is essential for the operation of numerous spintronic devices ranging from magnetic memory to spin torque microwave generators. Examples are microwave-assisted switching of magnetic structures and the generation of spin currents at low bias fields by high-amplitude ferromagnetic resonance. Here we use X-ray magnetic circular dichroism to determine the number den...

Thickness dependence of spin wave excitations in an artificial square spin ice-like geometry

Emergence of nontrivial magnetic excitations in a spin-liquid state of kagomé volborthite.

When quantum fluctuations destroy underlying long-range ordered states, novel quantum states emerge. Spin-liquid (SL) states of frustrated quantum antiferromagnets, in which highly correlated spins fluctuate down to very low temperatures, are prominent examples of such quantum states. SL states often exhibit exotic physical properties, but the precise nature of the elementary excitations behind...

One-dimensional spin-liquid without magnon excitations

It is shown that a sufficiently strong four-spin interaction in the spin-1/2 spin ladder can cause dimerization. Such interaction can be generated either by phonons or (in the doped state) by the conventional Coulomb repulsion between the holes. The dimerized phases are thermodynamically undistinguishable from the Haldane phase, but have dramatically different correlation functions: the dynamic...