Motivated by recent experiments on thin films of the ferromagnetic insulator yttrium-iron garnet (YIG), we have developed an efficient microscopic approach to calculate the spin-wave spectra of these systems. We model the experimentally relevant magnon band of YIG using an effective quantum Heisenberg model on a cubic lattice with ferromagnetic nearest neighbour exchange and long-range dipole-d...

Lateral one-dimensional imaging of cobalt ~Co! films by means of microscopic ferromagnetic resonance ~FMR! detected using the magnetic resonance force microscope ~MRFM! is demonstrated. A novel approach involving scanning a localized magnetic probe is shown to enable FMR imaging in spite of the broad resonance linewidth. We introduce a spatially selective local field by means of a small, magnet...

We investigate the origin of the spin Seebeck effect in yttrium iron garnet (YIG) samples for film thicknesses from 20 nm to 50  μm at room temperature and 50 K. Our results reveal a characteristic increase of the longitudinal spin Seebeck effect amplitude with the thickness of the insulating ferrimagnetic YIG, which levels off at a critical thickness that increases with decreasing temperature....

We demonstrate the modulation of spin Seebeck effect (SSE) by hydrogenation in Pd/YIG bilayers. In presence 3% hydrogen gas, SSE voltage decreases more than 50% from magnitude observed pure Ar gas. The is reversible, but recovery to prehydrogenation value takes a few days because long time constant desorption. also that Hall magnetoresistance identical sample reduces significantly with exposure...

An experiment by groups at Ecole Polytechnique and Institute de Physique Nucl eaire (Orsay) used high resolution TEM to study the morphology of MeV C60 and C20 tracks in Y3Fe5O12 (YIG). Their data consist of measurements of latent track radii, total track lengths, and the length over which the radius remains constant. The one parameter in the model presented here is determined separately from t...

The role of damping in the spin Seebeck effect (SSE) was studied experimentally for the first time. The experiments used Y3Fe5O12 (YIG)/Pt bilayered structures where the YIG films exhibit very similar structural and static magnetic properties but very different damping. The data show that a decrease in the damping gives rise to an increase in the SSE coefficient, which is qualitatively consiste...

Metamaterials offer the prospect of new science and applications. They have been designed by shaping or changing the material of the individual meta-molecules to achieve properties not naturally attainable. Composite meta-molecules incorporating a magnetic component offer new opportunities. In this work we report on the interaction between a non-magnetic split ring resonator (SRR) and a thin fi...

The characteristics of EMF (U) generation in the thin-film Pt/YIG structures caused by hybridization propagating magnetostatic surface waves with exchange modes YIG film were studied. It was shown that at frequencies f* corresponding to dipole-exchange resonances (DER) magnitude U increases several times comparison different from DER (f?f*). Volt-Watt sensitivity estimated for geometries Pt mic...