One of the most plausible scenario for the mechanism of the unconventional superconductivity is the magnetically-mediate Cooper pair. The iron-based superconductors are much known as an unconventional type, thus a number of inelastic neutron scattering studies were reported to evidence a strong relationship between the spin excitations and superconductivity. Here we present recent progress on...
Magnonics is a concept using magnons - the collective excitation quanta of the spin system in magnetically ordered materials - as carriers for information. Magnons are waves of the electrons’ spin precessional motion. They propagate without charge transport and its associated Ohmic losses, paving the way for a substantial reduction of energy consumption in computers.
The full potential of...
CeRhIn5 is a prototypical strongly correlated metal attracting much attention because of it peculiar magnetic and electronic properties. However, despite the intense studies two aspects of the ambient pressure magnetic structure of this heavy fermion material have remained under some debate since its discovery: whether the structure is indeed an incommensurate helix or a spin density wave, and...
Inelastic neutron scattering studies on the magnetic excitation in a stripe-ordered Pr3/2Sr1/5NiO4 at 5K reveal that the magnetic incommensurability (ε = 0.4) as result of admixing stripe dicommensuration in the checkerboard matrix in NiO2 plane. A suggested linear spin-wave model accounting 3D-stripe discommensuration with two-fold exchange interactions between Ni2+ spins, provides a good...
Brillouin light scattering microscopy (TR-μBLS) measurements on a Permalloy disk magnetized in the vortex state are presented. By applying a homogenous out-of-plane AC field with sufficiently large amplitudes it is possible to drive the spin waves in the nonlinear regime and initiate three- and four-magnon scattering processes.
Time resolved µBLS is used to show that these pumping conditions...