Results 41 to 50 of about 22,831 (243)

Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets

Machines, 2022
Permanent magnet synchronous motors (PMSMs), with their high power density, high efficiency, and thermal stability, are widely used nowadays. PMSM magnets are composed of rare earth elements.
Si-Woo Song, Hyun-Jo Pyo, Dong-Woo Nam, Ju Lee, Won-Ho Kim   +4 more
doaj   +1 more source

Detecting Partial Demagnetization in AFPM Generators by Monitoring Speed and EMF Induced in a Supplemental Winding

IEEE Transactions on Industrial Informatics, 2021
In this article, a novel method to detect the partial demagnetization in air-cored permanent-magnet axial-flux generators is proposed. Its principle is to monitor a speed-normalized fault detection signal.
Giorgos A. Skarmoutsos, K. Gyftakis, M. Mueller   +2 more
semanticscholar   +1 more source

Demagnetization-borne microscale skyrmions

Physical Review B, 2012
Magnetic systems are an exciting realm of study that is being explored on smaller and smaller scales. One extremely interesting magnetic state that has gained momentum in recent years is the skyrmionic state. It is characterized by a vortex where the edge magnetic moments point opposite to the core.
Johnson, Patrick, Gangopadhyay, A K, Kalyanaraman, Ramki, Nussinov, Zohar   +3 more
openaire   +3 more sources

Indirect excitation of ultrafast demagnetization [PDF]

Scientific Reports, 2016
AbstractDoes the excitation of ultrafast magnetization require direct interaction between the photons of the optical pump pulse and the magnetic layer? Here, we demonstrate unambiguously that this is not the case. For this we have studied the magnetization dynamics of a ferromagnetic cobalt/palladium multilayer capped by an IR-opaque aluminum layer ...
Boris, Vodungbo, Bharati, Tudu, Bahrati, Tudu, Jonathan, Perron, Renaud, Delaunay, Leonard, Müller, Magnus H, Berntsen, Gerhard, Grübel, Grégory, Malinowski, Christian, Weier, Julien, Gautier, Guillaume, Lambert, Philippe, Zeitoun, Christian, Gutt, Emmanuelle, Jal, Alexander H, Reid, Patrick W, Granitzka, Nicolas, Jaouen, Georgi L, Dakovski, Stefan, Moeller, Michael P, Minitti, Ankush, Mitra, Sebastian, Carron, Bastian, Pfau, Clemens, von Korff Schmising, Michael, Schneider, Stefan, Eisebitt, Jan, Lüning   +27 more
openaire   +8 more sources

Local Demagnetization Detection in Six-Phase Permanent Magnet Synchronous Machines

IEEE transactions on industrial electronics (1982. Print)
The partial demagnetization process in surface-mounted permanent-magnet synchronous motors (SMPMSMs) negatively affects the performance of an electric drive, reducing the rated torque and the efficiency of the machine.
L. Vancini, M. Mengoni, G. Rizzoli, L. Zarri, A. Tani   +4 more
semanticscholar   +1 more source

Magnetic Force Microscopy Signatures of Higher‐Order Skyrmions and Antiskyrmions

Advanced Functional Materials, EarlyView.
Magnetic force microscopy operated under vacuum conditions enables the qualitative identification of higher‐order skyrmions and antiskyrmions in Co/Ni multilayers at room temperature. Distinct stray‐field contrast signatures arise from vertical Bloch lines and complex domain‐wall configurations.
Sabri Koraltan, Joe Sunny, Tamer Karaman, Reshma Peremadathil‐Pradeep, Emily Darwin, Felix Büttner, Dieter Suess, Hans Josef Hug, Manfred Albrecht   +8 more
wiley   +1 more source

Self‐Cooling Molecular Spin Qudits

Advanced Materials, EarlyView.
A material made of [GdEr] molecular dimers can encode a qudit and perform as a magnetic refrigerant. Microwave resonant pulses coherently manipulate its 16 spin states, while direct demagnetization measurements cool the material and a device down to temperatures below 1 K.
Elías Palacios, David Aguilà, David Gracia, Diamatoula Maniaki, Leoní A. Barrios, Alessandro Chiesa, Jesús I. Martínez, Valentin Novikov, Olivier Roubeau, Stefano Carretta, Marco Evangelisti, Guillem Aromí, Fernando Luis   +12 more
wiley   +1 more source

C16 Phase High Entropy Borides With High Magnetic Anisotropy

Advanced Materials, EarlyView.
Rare‐earth‐free C16‐phase high entropy boride thin films exhibit enhanced magnetic anisotropy with coercivities surpassing their binary and ternary counterparts. Combinatorial synthesis of (Fe‐Co‐Ni‐Mn)2B films combined with density functional theory enables mapping of the magnetic properties across the composition space, revealing high entropy ...
Willie B. Beeson, Dhritiman Bhattacharya, Dinesh Bista, Bradley J. Fugetta, Gen Yin, Kai Liu   +5 more
wiley   +1 more source

Robust Model-Free Nonsingular Terminal Sliding Mode Control for PMSM Demagnetization Fault

IEEE Access, 2019
In this paper, a robust model-free nonsingular terminal sliding-mode control (MFNTSMC) algorithm based on the ultra-local model is proposed to reduce the influence of permanent magnet (PM) demagnetization for PM synchronous motors (PMSMs).
Kaihui Zhao, Tonghuan Yin, Changfan Zhang, Jing He, Xiangfei Li, Yue Chen, Ruirui Zhou, Aojie Leng   +7 more
semanticscholar   +1 more source

Electric‐Current‐Assisted Nucleation of Zero‐Field Hopfion Rings

Advanced Materials, EarlyView.
This work reports a novel and efficient nucleation protocol for 3D localized topological magnetic solitons‐hopfion rings in chiral magnets using pulsed electric currents. By using Lorentz transmission electron microscopy and topological analysis, we report characteristic features and extraordinary stability of hopfion rings in zero or inverted external
Xiaowen Chen, Dongsheng Song, Filipp N. Rybakov, Nikolai S. Kiselev, Long Li, Wen Shi, Rui Wu, Xuewen Fu, Olle Eriksson, Stefan Blügel, Rafal E. Dunin‐Borkowski, Haifeng Du, Fengshan Zheng   +12 more
wiley   +1 more source