document

Constructing accurate equivalent electrical circuit models of lithium iron phosphate and lead-acid battery cells for solar home system applications

Yu, Y. (author), Narayan, N.S. (author), Vega Garita, V.E. (author), Popovic, J. (author), Qin, Z. (author), Wagemaker, M. (author), Bauer, P. (author), Zeman, M. (author)

The past few years have seen strong growth of solar-based off-grid energy solutions such as Solar Home Systems (SHS) as a means to ameliorate the grave problem of energy poverty. Battery storage is an essential component of SHS. An accurate battery model can play a vital role in SHS design. Knowing the dynamic behaviour of the battery is...

journal article 2018

document

Chiral Pumping of Spin Waves

Yu, T. (author), Blanter, Y.M. (author), Bauer, G.E. (author)

We report a theory for the coherent and incoherent chiral pumping of spin waves into thin magnetic films through the dipolar coupling with a local magnetic transducer, such as a nanowire. The ferromagnetic resonance of the nanowire is broadened by the injection of unidirectional spin waves that generates a nonequilibrium magnetization in only...

journal article 2019

document

Chiral excitation of spin waves in ferromagnetic films by magnetic nanowire gratings

Yu, T. (author), Liu, Chuanpu (author), Yu, Haiming (author), Blanter, Y.M. (author), Bauer, G.E. (author)

We theoretically investigate the interlayer dipolar and exchange couplings between an array of metallic magnetic nanowires grown on top of an extended ultrathin yttrium iron garnet film. The calculated interlayer dipolar coupling agrees with observed anticrossings [Chen et al., Phys. Rev. Lett. 120, 217202 (2018)PRLTAO0031-900710.1103...

journal article 2019

document

Surface dynamics of rough magnetic films

Yu, T. (author), Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author)

The chirality of magnetostatic Damon-Eshbach (DE) magnons affects the transport of energy and angular momentum at the surface of magnetic films and spheres. We calculate the surface-disorder-limited dephasing and transport lifetimes of surface modes of sufficiently thick high-quality ferromagnetic films such as yttrium iron garnet. Surface...

journal article 2019

document

Excitation of unidirectional exchange spin waves by a nanoscale magnetic grating

Chen, Jilei (author), Yu, T. (author), Liu, Chuanpu (author), Liu, Tao (author), Madami, Marco (author), Shen, Ka (author), Zhang, J (author), Blanter, Y.M. (author), Bauer, G.E. (author)

Magnon spintronics is a prosperous field that promises beyond-CMOS technology based on elementary excitations of the magnetic order that act as information carriers for future computational architectures. Unidirectional propagation of spin waves is key to the realization of magnonic logic devices. However, previous efforts to enhance the...

journal article 2019

document

Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator

Bertelli, I. (author), Carmiggelt, J.J. (author), Yu, T. (author), Simon, B.G. (author), Pothoven, C.C. (author), Bauer, G.E. (author), Blanter, Y.M. (author), Aarts, J.M. (author), van der Sar, T. (author)

Spin waves-the elementary excitations of magnetic materials-are prime candidate signal carriers for low-dissipation information processing. Being able to image coherent spin-wave transport is crucial for developing interference-based spin-wave devices. We introduce magnetic resonance imaging of the microwave magnetic stray fields that are...

journal article 2020

document

Nonreciprocal coherent coupling of nanomagnets by exchange spin waves

Wang, Hanchen (author), Chen, Jilei (author), Yu, T. (author), Liu, Chuanpu (author), Guo, Chenyang (author), Liu, Song (author), Shen, Ka (author), Jia, Hao (author), Bauer, G.E. (author)

Nanomagnets are widely used to store information in non-volatile spintronic devices. Spin waves can transfer information with low-power consumption as their propagations are independent of charge transport. However, to dynamically couple two distant nanomagnets via spin waves remains a major challenge for magnonics. Here we experimentally...

journal article 2020

document

Chiral coupling of magnons in waveguides

Yu, T. (author), Zhang, Xiang (author), Sharma, S. (author), Blanter, Y.M. (author), Bauer, G.E. (author)

We theoretically investigate the collective excitations of multiple (sub)millimeter-sized ferromagnets mediated by waveguide photons. By the position of the magnets in the waveguide, the magnon-photon coupling can be tuned to be chiral, i.e., magnons only couple with photons propagating in one direction, leading to an asymmetric transfer of...

journal article 2020

document

Magnon Accumulation in Chirally Coupled Magnets

Yu, T. (author), Zhang, Yu Xiang (author), Sharma, S. (author), Zhang, Xiang (author), Blanter, Y.M. (author), Bauer, G.E. (author)

We report strong chiral coupling between magnons and photons in microwave waveguides that contain chains of small magnets on special lines. Large magnon accumulations at one edge of the chain emerge when exciting the magnets by a phased antenna array. This mechanism holds the promise of new functionalities in nonlinear and quantum magnonics.

journal article 2020

document

Noncontact Spin Pumping by Microwave Evanescent Fields

Yu, T. (author), Bauer, G.E. (author)

The angular momentum of evanescent light fields has been studied in nano-optics and plasmonics but not in the microwave regime. Here we predict noncontact pumping of electron spin currents in conductors by the evanescent stray fields of excited magnetic nanostructures. The coherent transfer of the photon to the electron spin is proportional...

journal article 2020

document

Unidirectional Pumping of Phonons by Magnetization Dynamics

Zhang, Xiang (author), Bauer, G.E. (author), Yu, T. (author)

We propose a method to control surface phonon transport by weak magnetic fields based on the pumping of surface acoustic waves (SAWs) by magnetostriction. We predict that the magnetization dynamics of a nanowire on top of a dielectric films injects SAWs with opposite angular momenta into opposite directions. Two parallel nanowires form a...

journal article 2020

document

Impact of Uncontrolled Charging with Mass Deployment of Electric Vehicles on Low Voltage Distribution Networks

Yu, Y. (author), Shekhar, A. (author), Chandra Mouli, G.R. (author), Bauer, P. (author), Refa, Nazir (author), Bernards, Raoul (author)

This study aims to quantity the impact of uncontrolled charging of Electric Vehicles (EVs) on the low voltage distribution networks with increasing EV penetration levels. For this objective, key indicators are developed to show the magnitude, scale and duration of the impact on the distribution network. The disseminated results are based on the...

conference paper 2020

document

Imaging Spin-Wave Damping Underneath Metals Using Electron Spins in Diamond

Bertelli, I. (author), Simon, B.G. (author), Yu, T. (author), Aarts, Jan (author), Bauer, G.E. (author), Blanter, Y.M. (author), van der Sar, T. (author)

Spin waves in magnetic insulators are low-damping signal carriers that can enable a new generation of spintronic devices. The excitation, control, and detection of spin waves by metal electrodes is crucial for interfacing these devices to electrical circuits. As such, it is important to understand metal-induced damping of spin-wave transport,...

journal article 2021

document

Power Hardware-in-the-Loop Demonstrator for Electric Vehicle Charging in Distribution Grids

De Herdt, Lode (author), Shekhar, A. (author), Yu, Y. (author), Chandra Mouli, G.R. (author), Dong, J. (author), Bauer, P. (author)

A simple and low-cost Power Hardware-in-the-Loop (PHIL) demonstrator is developed for the purpose of studying the impact of Electric Vehicle (EV) charging on low voltage distribution grids. An energy saving power circulating method with potential bi-directional function is proposed in this study as well. The distribution grid under test runs on...

conference paper 2021

document

A Transformer Isolated Driving Method for SiC MOSFETs with a Constant Negative Off Voltage

Yu, G. (author), Ghaffarian Niasar, M. (author), Ganeshpure, D.A. (author), Soeiro, Thiago B. (author), Bauer, P. (author)

SiC MOSFETs have become more and more popular in recent years. Apart from its superior performance, attentions should be paid to its driving method. In this paper, an improved transformer driving circuit is proposed which can provide an almost constant negative turn-off voltage within a wide dutycycle range. Both simulation and experimental...

conference paper 2021

document

Aggregated Impact of EV Charger Type and EV Penetration level in Improving PV Integration in Distribution Grids

Wagh, Saumitra (author), Yu, Y. (author), Shekhar, A. (author), Chandra Mouli, G.R. (author), Bauer, P. (author)

Mass deployment of Electric Vehicles (EVs) can improve the loading characteristics of low voltage distribution grids with high Photovoltaic (PV) penetration. This impact is investigated in the paper from two point of views, namely, the EV charger type and the EV penetration level. Based on the measured usage data for home, public and semi-public...

conference paper 2021

document

Study of Back-end DC/DC Converter for 3.7 kW Wireless Charging System according to SAE J2954

Yu, G. (author), Soeiro, Thiago B. (author), Dong, J. (author), Bauer, P. (author)

In a wireless charging system, a back-end DC/DC converter can be used after the coil rectification stage to match the battery charging requirements and to optimize the resonant converter operation. In this paper, a synchronous boost converter is selected according to suggested coil parameters from SAE J2954 standards on a WPT1 3.7 kW power class...

conference paper 2021

document

Design of a Highly Efficient 20 kW Inductive Power Transfer System with Improved Misalignment Performance

Shi, W. (author), Dong, J. (author), Soeiro, Thiago B. (author), Riekerk, C. (author), Grazian, F. (author), Yu, G. (author), Bauer, P. (author)

Due to the urgent desire for a fast, convenient, and efficient battery charging technology for electric vehicle (EV) users, extensive research has been conducted into the design of high-power inductive power transfer (IPT) systems. However, there are few studies that formulate the design as a multiobjective optimization (MOO) research...

journal article 2022

document

Comparative Impact of Three Practical Electric Vehicle Charging Scheduling Schemes on Low Voltage Distribution Grids

Yu, Y. (author), Shekhar, A. (author), Chandra Mouli, G.R. (author), Bauer, P. (author)

This paper benchmarks the performance of three practical electric vehicle (EV) charging scheduling methods relative to uncontrolled charging (UNC) in low-voltage (LV) distribution grids. The charging methods compared are the voltage droop method (VDM), price-signal-based method (PSM) and average rate method (ARM). Trade-offs associated with the...

journal article 2022

document

Data-Driven Study of LV Distribution Grid Behaviour with Increasing Electric Vehicle Penetration

Yu, Y. (author), Reihs, David (author), Wagh, Saumitra (author), Shekhar, A. (author), Stahleder, Daniel (author), Chandra Mouli, G.R. (author), Lehfuss, Felix (author), Bauer, P. (author)

In this paper, the impact of Electric Vehicle (EV) uncontrolled charging with four levels of EV penetration in overall 21 real low voltage distribution grids in two seasons are analysed. The employed real grid data is provided by distribution system operators from three European countries: Austria, Germany and the Netherlands. At least six...

journal article 2022