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Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author)
Brillouin light scattering is an established technique to study magnons, the elementary excitations of a magnet. Its efficiency can be enhanced by cavities that concentrate the light intensity. Here, we theoretically study inelastic scattering of photons by a magnetic sphere that supports optical whispering gallery modes in a plane normal to...
journal article 2017
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Mackay, L.J. (author), van der Blij, N.H. (author), Ramirez Elizondo, L.M. (author), Bauer, P. (author)
AbstractDue to an increasing number of power generation units and load devices operating with direct current (DC) at distribution level, there is a potential benefit of leading efforts toward building a DC distribution system. However, the implementation of DC distribution systems faces important challenges, including the market inertia of AC...
journal article 2017
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Hashimoto, Yusuke (author), Daimon, Shunsuke (author), Iguchi, Ryo (author), Oikawa, Yasuyuki (author), Shen, K. (author), Sato, Koji (author), Bossini, Davide (author), Tabuchi, Yutaka (author), Satoh, Takuya (author), Hillebrands, Burkard (author), Bauer, G.E. (author), Johansen, Tom H. (author), Kirilyuk, Andrei (author), Rasing, Theo (author), Saitoh, Eiji (author)
To know the properties of a particle or a wave, one should measure how its energy changes with its momentum. The relation between them is called the dispersion relation, which encodes essential information of the kinetics. In a magnet, the wave motion of atomic spins serves as an elementary excitation, called a spin wave, and behaves like a...
journal article 2017
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Chandra Mouli, G.R. (author), Schijffelen, Jos H. (author), Bauer, P. (author), Zeman, M. (author)
Grid-connected photovoltaic (PV) inverters have a dc/dc converter connected to the PV for executing the maximum power point tracking. The design of an interleaved boost converter (IBC) with three switching legs for a 10-kW PV inverter is presented in this paper. This paper shows how the use of silicon carbide (SiC) switches and powdered iron...
journal article 2017
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den Heeten, Thomas (author), Narayan, N.S. (author), Diehl, J.C. (author), Verschelling, Jeroen (author), Silvester, S. (author), Popovic, J. (author), Bauer, P. (author), Zeman, M. (author)
Solar Home Systems (SHSs) can fulfil the basic energy needs of the globally unelectrified population. With costs as one of the biggest barriers for SHS uptake, optimizing the system size with energy needs is crucial. Where most solutions focus only on the present needs, this work also addresses the future energy needs. The methodology includes...
conference paper 2017
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Keshtgar, H. (author), Streib, S.D. (author), Kamra, Akashdeep (author), Blanter, Y.M. (author), Bauer, G.E. (author)
We address the theory of the coupled lattice and magnetization dynamics of freely suspended single-domain nanoparticles. Magnetic anisotropy generates low-frequency satellite peaks in the microwave absorption spectrum and a blueshift of the ferromagnetic resonance (FMR) frequency. The low-frequency resonances are very sharp with maxima...
journal article 2017
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Flebus, Benedetta (author), Shen, K. (author), Kikkawa, Takashi (author), Uchida, Ken Ichi (author), Qiu, Zhiyong (author), Saitoh, Eiji (author), Duine, Rembert A. (author), Bauer, G.E. (author)
We theoretically study the effects of strong magnetoelastic coupling on the transport properties of magnetic insulators. We develop a Boltzmann transport theory for the mixed magnon-phonon modes ("magnon polarons") and determine transport coefficients and the spin diffusion length. Magnon-polaron formation causes anomalous features in the...
journal article 2017
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Chiba, Takahiro (author), Takahashi, Saburo (author), Bauer, G.E. (author)
We theoretically study the magnetoresistance (MR) of two-dimensional massless Dirac electrons as found on the surface of three-dimensional topological insulators (TIs) that are capped by a ferromagnetic insulator (FI). We calculate charge and spin transport by Kubo and Boltzmann theories, taking into account the ladder-vertex correction and...
journal article 2017
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Xie, Li Shan (author), Jin, Guang Xi (author), He, Lixin (author), Bauer, G.E. (author), Barker, Joseph (author), Xia, Ke (author)
Yttrium iron garnet is the ubiquitous magnetic insulator used for studying pure spin currents. The exchange constants reported in the literature vary considerably between different experiments and fitting procedures. Here we calculate them from first principles. The local Coulomb correction (U-J) of density-functional theory is chosen such...
journal article 2017
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Yan, Peng (author), Bauer, G.E. (author), Zhang, Huaiwu (author)
The concept of temperature in nonequilibrium thermodynamics is an outstanding theoretical issue. We propose an energy repartition principle that leads to a spectral (mode-dependent) temperature in steady-state nonequilibrium systems. The general concepts are illustrated by analytic solutions of the classical Heisenberg spin chain connected to...
journal article 2017
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van der Blij, N.H. (author), Ramirez Elizondo, L.M. (author), Spaan, M.T.J. (author), Bauer, P. (author)
Instability caused by low inertia and constant power loads is a major challenge of DC distribution grids. Previous research uses oversimplified models or does not provide general rules for stability. Therefore, a comprehensive approach to analyze the stability of DC distribution systems is desired. This paper presents a method to algebraically...
journal article 2017
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Cahaya, A.B. (author), Leon, Alejandro O. (author), Bauer, G.E. (author)
"Spin pumping" is the injection of spin angular momentum by a time-dependent magnetization into an adjacent normal metal proportional to the spin mixing conductance. We study the role of electrostatic interactions in the form of crystal fields on the pumped spin currents generated by insulators with exchange-coupled local moments at the...
journal article 2017
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Prasanth, V. (author), Bandyopadhyay, S. (author), Bauer, P. (author), Ferreira, J.A. (author)
This paper deals with a generic methodology to evaluate the magnetic parameters of contactless power transfer systems. Neumann's integral has been used to create a matrix method that can model the magnetics of single coils (circle, square, rectangle). The principle of superposition has been utilized to extend the theory to multi-coil...
journal article 2017
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Vega Garita, V.E. (author), Ramirez Elizondo, L.M. (author), Bauer, P. (author)
Solar-battery systems are still expensive, bulky, and space consuming. To tackle these issues, we propose a novel device that combines all the components of a solar-battery system in one device. This device might help reduce installation cost compared to the current solar-battery systems as well as provide a plug-and-play solution. However, this...
journal article 2017
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Kontos, E. (author), Tsolaridis, Georgios (author), Teodorescu, Remus (author), Bauer, P. (author)
Due to the increase of power electronic-based loads, the maintenance of high power quality poses a challenge in modern power systems. To limit the total harmonic distortion in the line voltage and currents at the point of the common coupling (PCC), active power filters are commonly employed. This paper investigates the use of the multilevel...
journal article 2017
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Chandra Mouli, G.R. (author), Prasanth, V. (author), Bauer, P. (author)
Charging infrastructure for electric vehicles (EV) will be the key factor for ensuring a smooth transition to e-mobility. This paper focuses on five technologies that will play a fundamental role in this regard: smart charging, vehicle-to-grid (V2G), charging of EVs from photovoltaic panels (PV), contactless charging and on-road charging of...
conference paper 2017
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Tsolaridis, Georgios (author), Kontos, E. (author), Chaudhary, Sanjay K. (author), Bauer, P. (author), Teodorescu, Remus (author)
Grid faults are common in power systems and can have a severe impact on the operation of the converters in the system. In this paper, the operation of a Modular Multilevel Converter (MMC)-based Static Synchronous Compensators (STATCOM) is investigated during grid faults. The study focuses on the challenging internal control of the converter...
journal article 2017
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Shekhar, A. (author), Kontos, E. (author), Ramirez Elizondo, L.M. (author), Rodrigo Mor, A. R. (author), Bauer, P. (author)
It is anticipated that with the thrust towards use of clean energy resources such as electric vehicles, future distribution grids will face a steep increase in power demand, forcing the utility operators to invest in enhancing the power delivering capacity of the grid infrastructure. It is identified that the critical 5–20 km medium voltage (MV)...
journal article 2017
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Chandra Mouli, G.R. (author), Van Der Meer, Dennis (author), Bauer, P. (author), Zeman, M. (author), Schijffelen, Jos H. (author), van den Heuvel, Mike (author), Kardolus, Menno (author)
abstract 2017
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Juarez-Acosta, I. (author), Olivares-Robles, M.A. (author), Bosu, S. (author), Sakuraba, Y. (author), Kubota, T. (author), Takahashi, S. (author), Takanashi, K. (author), Bauer, G.E.W. (author)
We model the charge, spin, and heat currents in ferromagnetic metal?normal metal?normal metal trilayer structures in the two current model, taking into account bulk and interface thermoelectric properties as well as Joule heating. The results include the temperature distribution as well as resistance-current curves that reproduce the observed...
journal article 2016
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