Ferromagnetic resonance in a topographically modulated permalloy film

Sklenar, Joseph; Tucciarone, P.; Lee, R. J.; Tice, Daniel B.; Chang, Robert P. H.; Lee, S. J.; Nevirkovets, I. P.; Heinonen, Olle; Ketterson, J. B.

doi:10.1103/physrevb.91.134424

Cited by 6 publications

(2 citation statements)

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“…One pathway to control magnon dispersions is to construct magnonic crystals [7,8] that are metamaterials with a spatial modulation of the magnetic properties on length scales comparable to relevant magnonic wavelengths [9][10][11]. Patterned thin magnetic films [12,13] or topographically modulated thin films have been used to manipulate the magnon spectra [14]. This approach is similar to superlattices in photonics and, fundamentally, to the crystal structure of semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable wave band structure of an artificial square ice

et al. 2016

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Artificial square ices are structures composed of magnetic nanoelements arranged on the sites of a twodimensional square lattice, such that there are four interacting magnetic elements at each vertex, leading to geometrical frustration. Using a semianalytical approach, we show that square ices exhibit a rich spin-wave band structure that is tunable both by external magnetic fields and the magnetization configuration of individual elements. Internal degrees of freedom can give rise to equilibrium states with bent magnetization at the element edges leading to characteristic excitations; in the presence of magnetostatic interactions these form separate bands analogous to impurity bands in semiconductors. Full-scale micromagnetic simulations corroborate our semianalytical approach. Our results show that artificial square ices can be viewed as reconfigurable and tunable magnonic crystals that can be used as metamaterials for spin-wave-based applications at the nanoscale.

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Section: Introductionmentioning

confidence: 99%

Reconfigurable wave band structure of an artificial square ice

et al. 2016

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“…The finite value of 2Δ was recently experimentally detected in semiconducting carbon nanotubes 24 and in graphene stripes with atomic armchair and zigzag edges. 25 In such materials, 25,55 if the temperature T is lower than 2Δ/k B , then the contribution of the thermally excited electrons and holes is eliminated. Therefore, the thermal conductivity [56][57][58] κ ph is mostly determined due to the propagation of acoustic phonons where c is the specific heat, s is the acoustic phonon velocity (which roughly coincides with the speed of sound), l ph = sτ ph is the phonon mean free path, τ ph is the phonon relaxation time.…”

Section: Phonon-electron Scattering In 2d Atomic Monolayersmentioning

confidence: 99%

Graphene thermal flux transistor

Shafranjuk

2016

Nanoscale

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Insufficient flexibility of existing approaches to controlling the thermal transport in atomic monolayers limits their capability for use in many applications. Here, we examine the means of electrode doping to control the thermal flux Q due to phonons propagating along the atomic monolayer. We found that the frequency of the electron-restricted phonon scattering strongly depends on the concentration n. of the electric charge carriers, established by the electric potentials applied to local gates. As a result of the electrode doping, n is increased, causing a sharp rise in both the electrical conductivity and Seebeck coefficient, while the thermal conductivity tumbles. Therefore, the effect of the thermal transistor improves the figure of merit of nanoelectronic circuits.

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