Results 21 to 30 of about 1,681 (168)

Longitudinal evolution of magnetization of ferromagnets following ultrafast demagnetization: Role of finite size and shape of demagnetized region

Condensed Matter Physics, 2014
A dependence of a relaxation rate on the shape of the demagnetized region for a longitudinal evolution of total magnetization to its equilibrium value following the ultrafast demagnetization is demonstrated. This shape-dependence is caused by a motion of
I.A. Yastremsky
doaj   +1 more source

Structural Design of Demagnetization Detection Robot in Oil and Gas Pipeline

Shiyou jixie, 2020
The oil and gas pipelines in service will produce certain residual magnetism due to the influence of various factors. To quickly and efficiently eliminate the residual magnetism, according to the theory of dynamic demagnetization of permanent magnets, a ...
Jia Shihao, Zhao Hong
doaj  

Closed-Loop Magnetization State Control for a Variable-Flux Memory Machine

IEEE Access, 2020
Variable flux memory machines (VFMM) use magnetization and demagnetization manipulations to adjust machine voltage, achieving wide-speed high-efficiency operation.
Yusheng Hu, Junhua Chen, Ronghai Qu, Bin Chen, Yong Xiao, Xia Li   +5 more
doaj   +1 more source

Demagnetization Analysis of Interior Permanent Magnet Synchronous Motors Under Realistic Vehicle Driving Conditions

IEEE Access
Electric vehicles primarily use interior permanent magnet synchronous motors (IPMSMs) as traction motors. Although IPMSMs are powerful and efficient, their neodymium-based permanent magnets are susceptible to demagnetization under high-temperature ...
Yun-Jin Yang, Dae-Han Kim, Yong-Min You
doaj   +1 more source

Electrodeposition and Properties of Copper Layer on NdFeB Device

Cailiao gongcheng, 2017
To decrease the impact of the regular Ni/Cu/Ni coating on the magnetic performance of sintered NdFeB device, alkaline system of HEDP complexing agent was applied to directly electro-deposit copper layer on NdFeB matrix, then nickel layer was ...
LI Yue, ZHU Li-qun, LI Wei-ping, LIU Hui-cong, NAN Hai-yang   +4 more
doaj   +1 more source

Ultrawide Bandwidth Optomechanical Magnetometry Using Flux Concentration

Advanced Functional Materials, EarlyView.
High‐permeability flux concentrators enable ultrawide‐bandwidth chip‐scale optomechanical magnetometry by exploiting magnetic nonlinearity to up‐convert low‐frequency fields to the mechanical resonance, where sensitivity is optimal. This enables flat wideband operation over more than four orders of magnitude, from tens of kilohertz to sub‐hertz ...
Benjamin J. Carey, Nathaniel Bawden, Fernando Gottardo, James S. Bennett, Douglas Bulla, Scott Foster, Warwick P. Bowen   +6 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

Fault-Tolerant Redesign of a Quad-Winding PMSM to Prevent Irreversible Partial Demagnetization

Actuators
This paper proposes a fault-tolerant optimal design method for quad-winding permanent magnet synchronous motors (PMSMs) considering irreversible demagnetization under fault conditions.
Min-Seong Jo, Young-Joon Song, Kyung-il Woo, Kyu-Yun Hwang   +3 more
doaj   +1 more source

Outer rotor eddy current heater for wind turbines

Renewable Energy and Environmental Sustainability, 2016
This paper proposes a conversion system of wind energy into thermal energy by means of an outer rotor permanent magnet eddy current heater. The main advantages of this device are the following: compactness, easy temperature control by water flow rate ...
Tudorache Tiberiu, Melcescu Leonard
doaj   +1 more source

Room‐Temperature Skyrmionic Synapse in 2D Ferromagnet Fe3GaTe2 Operating via Collective Spin Texture Transformation

Advanced Materials, EarlyView.
We demonstrate a neuromorphic synapse in 2D Fe3GaTe2 flakes. The device operates via a current‐driven transformation from a skyrmion‐lattice to a stripe‐domain state, yielding a linear anomalous Hall resistance response with a tunable slope to enable multiply‐accumulate operations. Simulations confirm its viability in artificial neural networks.
Jixiang Huang, Tongji Zhu, PeiYu Cai, Xiaoming Ma, Zhen Wang, Ruifu Zhang, Yi Hao, Jingdi Lu, Liubing He, Jun Xu, Yuejie Zhang, Wanjun Jiang, Jing Tao, Shiming Lei, Pavel Parchinskiy, Jing Teng, Lingfei Wang, Wei Niu, Elton J.G. Santos, Xiaoqian Zhang, Peng Li   +20 more
wiley   +1 more source