Magnons coherent transmission and heat transport at ultrathin insulating ferromagnetic nanojunctions

Magnons coherent transmission and its heat transport at ultrathin insulating ferromagnetic nanojunctions

“…These results for the heat transport are however quite similar to our recent results [9] with the weaker J FeGd exchange, and need not be presented here. This leads to the conclusion that whereas the transmission spectra are strongly modified by the J FeGd exchange, the heat transport is not.…”

“…In a recent work [9] we have used a set of values from previous work [10], which uses the effective field theory over an Ising Hamiltonian to calculate the thermal averages of the magnetizations on the atomic spin layers at a nanojunction interface. The numerical results correspond hence to a relatively weak J FeGd .…”

Spin wave ballistic transport properties of [Co1−cGdcAshokan1, Khater2, Ghantous3 et al. 2015Journal of Magnetism and Magnetic MaterialsSelf Cite10060View full textAdd to dashboardCite

“…It has been observed that the conductance characteristics of Fano resonances play a preferential and important role for the magnon conductance [25]. In particular we observe that the .…”

“…The overall conductance for a selected nanojunction is important to calculate because it corresponds to an experimental measurable observable, as is the case, for example, for the thermal transport across such embedded nanostructures [25,27]. Although the phase field matching theory (PFMT) is formally equivalent to the nonequilibrium Green's function formalism (NEGF), it allows us in contrast to solve the scattering problem per each propagating spin wave mode, and directly for real energies.…”

“…A detailed analysis is presented to account for both the propagating and evanescent modes of the system, and the phase field matching theory (PFMT) is used to compute the scattering cross sections within the Landauer-Büttiker formalism [21,22]. The PFMT is a method originally developed for the scattering of phonons, magnons and more recently of electrons for a variety of nanosystems [19,20,[23][24][25][26][27][28][29][30]. It is equivalent to the non-equilibrium Green's function method but is a more transparent theoretical tool.…”