The E-Field-Induced Volatile and Nonvolatile Magnetization Switching of CoNi Thin Films in CoNi/PMN-PT Heterostructures

Jin, Tianli; Cao, Jiangwei; Hao, Liang; Wang, Ying; Wu, Depei; Bai, Junfeng; Wei, Fulin

doi:10.1109/tmag.2015.2443179

IEEE Trans. Magn.

2015

DOI: 10.1109/tmag.2015.2443179

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The E-Field-Induced Volatile and Nonvolatile Magnetization Switching of CoNi Thin Films in CoNi/PMN-PT Heterostructures

Tianli Jin

Jiangwei Cao

Liang Hao

et al.

Abstract: In this work，we report the giant electric-field (E-field) induced magnetic anisotropy and magnetization switching in CoNi/Pb(Mg 1/3 Nb 2/3 )O 3 -xPbTiO 3 (PMN-PT) magnetoelectric heterostructures. For CoNi/PMN-30%PT, the E-field induced anisotropy shows a volatile behavior; whereas for CoNi/PMN-32%PT, a large and nonvolatile E-field induced anisotropy field up to 54kA/m is observed. These behaviors can be understood by measuring the strain vs E-field curves of two kinds of substrates. On the basis of the E-fie… Show more

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Cited by 4 publications

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A coreless axial flux‐switching generator for micro‐wind turbine application

Dehshiri

Ketabi

2022

Energy Science & Engineering

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The efficiency, power density, and torque of axial flux generators are higher than those of radial flux generators. In this paper, a new axial flux switching generator with a coreless stator is designed for micro wind turbine applications. Generator parts are designed based on nominal values, and their dimensions are determined. Cogging torque is an undesired torque ripple intrinsic in the design of a permanent magnet generator, which should be minimized due to its effects: vibration and noise. In addition, since aerodynamic power is low during start-up at low wind speeds, the cogging torque must be as low as possible to achieve a low cut-in speed. The design, optimization, and fabrication of a new coreless axial flux-switching generator for micro-wind turbine application are investigated and compared with the conventional one. The prototype machine is an axial-field flux-switching permanent magnet generator with a two-rotor-one-stators configuration. The stator of the proposed generator is made up of coils and magnets and has no iron core. First, the generator's design to reduce cogging torque is investigated using nominal values, and the dimensions of the various parts of the generator are calculated according to these values. Then the designed generator was simulated three-dimensionally using the FEM. Finally, a prototype of the desired generator is built. Comparing the results obtained from the finite element method and laboratory testing shows that these results are broadly consistent.

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A coreless axial flux‐switching generator for micro‐wind turbine application

Dehshiri

Ketabi

2022

Energy Science & Engineering

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Nanopillars with E-field accessible multi-state (N ≥ 4) magnetization having giant magnetization changes in self-assembled BiFeO3-CoFe2O4/Pb(Mg1/3Nb2/3)-38at%PbTiO3 heterostructures

Tang

Viswan

Gao

et al. 2018

Sci Rep

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We have deposited self-assembled BiFeO3-CoFe2O4 (BFO-CFO) thin films on (100)-oriented SrRuO3-buffered Pb(Mg1/3Nb2/3)0.62Ti0.38O3 (PMN-38PT) single crystal substrates. These heterostructures were used for the study of real-time changes in the magnetization with applied DC electric field (EDC). With increasing EDC, a giant magnetization change was observed along the out-of-plane (easy) axis. The induced magnetization changes of the CFO nanopillars in the BFO/CFO layer were about ΔM/MrDC = 93% at EDC = −3 kv/cm. A giant converse magnetoelectric (CME) coefficient of 1.3 × 10−7 s/m was estimated from the data. By changing EDC, we found multiple(N ≥ 4) unique possible values of a stable magnetization with memory on the removal of the field.

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Analytical field model of segmented Halbach array permanent magnet machines considering iron nonlinearity

Zhang

Yang

et al. 2021

IET Electric Power Appl

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The permeability of the iron is usually assumed to be infinite by the linear subdomain technique, leading to the neglect of magnet saturation. This study presents an analytical model of a segmented Halbach array permanent magnet machine by considering the iron B-H curve and saturation effects. Firstly, the entire field problem is divided into six regions in the radial direction according to the excitation source. Then, Poisson's and Laplace's equations are solved in each region to obtain the magnetic vector potential. Specifically, in our approach, the teeth and slots' permeability variation is solved by Cauchy's product theorem. An iterative algorithm incorporates the nonlinearity of the iron. Subsequently, the electromagnetic performance, such as air-gap magnetic flux density, electromagnetic torque, and unbalanced magnetic force, is predicted by the analytical method. The analytical results are shown in line with those obtained from finite element analysis, and a prototype was fabricated to further verify the accuracy of the analytical method. Besides, the proposed method can also be used to evaluate the performance of the Halbach array machines with any number of segmented magnets. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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The E-Field-Induced Volatile and Nonvolatile Magnetization Switching of CoNi Thin Films in CoNi/PMN-PT Heterostructures

Cited by 4 publications

References 20 publications

A coreless axial flux‐switching generator for micro‐wind turbine application

A coreless axial flux‐switching generator for micro‐wind turbine application

Nanopillars with E-field accessible multi-state (N ≥ 4) magnetization having giant magnetization changes in self-assembled BiFeO3-CoFe2O4/Pb(Mg1/3Nb2/3)-38at%PbTiO3 heterostructures

Analytical field model of segmented Halbach array permanent magnet machines considering iron nonlinearity

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