Quantitative evaluation of magnetic flux density in a magnetic recording head and pseudo soft underlayer by electron holography

2010 ◽  
Vol 59 (5) ◽  
pp. 331-337 ◽  
Author(s):  
W. Xia ◽  
K. Hirata ◽  
K. Yanagisawa ◽  
Y. Ishida ◽  
H. Kasai ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Quantitative Evaluation ◽  
Magnetic Recording ◽  
Magnetic Flux Density ◽  
Electron Holography ◽  
Recording Head ◽  
Magnetic Recording Head

scholarly journals Magnetic flux density measurements from narrow grain boundaries produced in sintered permanent magnets

Microscopy ◽  
2020 ◽  
Author(s):  
Youngji Cho ◽  
Sujin Lee ◽  
Yasukazu Murakami
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Permanent Magnets ◽  
Thin Foil ◽  
Magnetic Flux Density ◽  
Electron Holography ◽  
Sintered Magnet ◽  
Density Measurements ◽  
Interface Magnetism

Abstract This review examines methods of magnetic flux density measurements from the narrow grain boundary (GB) regions, the thickness of which is of the order of nanometers, produced in Nd–Fe–B-based sintered magnets. Despite of the complex crystallographic microstructure and the significant stray magnetic field of the sintered magnet, recent progress in electron holography allowed for the determination of the intrinsic magnetic flux density due to the GB which is embedded in the polycrystalline thin-foil. The methods appear to be useful as well for intensive studies about interface magnetism in a variety of systems.

Electron holography of magnetic field generated by a magnetic recording head

Microscopy ◽  
2013 ◽  
Vol 62 (3) ◽  
pp. 383-389 ◽  
Author(s):  
Takayuki Goto ◽  
Jong Seok Jeong ◽  
Weixing Xia ◽  
Zentaro Akase ◽  
Daisuke Shindo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Recording ◽  
Electron Holography ◽  
Recording Head ◽  
Magnetic Recording Head

scholarly journals Design of a New 1D Halbach Magnet Array with Good Sinusoidal Magnetic Field by Analyzing the Curved Surface

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2522
Author(s):  
Guangdou Liu ◽  
Shiqin Hou ◽  
Xingping Xu ◽  
Wensheng Xiao
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Permanent Magnet ◽  
Flux Density ◽  
Permanent Magnets ◽  
Air Gap ◽  
Curved Surface ◽  
Magnetic Flux Density ◽  
Sinusoidal Magnetic Field ◽  
The Magnetic Field

In the linear and planar motors, the 1D Halbach magnet array is extensively used. The sinusoidal property of the magnetic field deteriorates by analyzing the magnetic field at a small air gap. Therefore, a new 1D Halbach magnet array is proposed, in which the permanent magnet with a curved surface is applied. Based on the superposition of principle and Fourier series, the magnetic flux density distribution is derived. The optimized curved surface is obtained and fitted by a polynomial. The sinusoidal magnetic field is verified by comparing it with the magnetic flux density of the finite element model. Through the analysis of different dimensions of the permanent magnet array, the optimization result has good applicability. The force ripple can be significantly reduced by the new magnet array. The effect on the mass and air gap is investigated compared with a conventional magnet array with rectangular permanent magnets. In conclusion, the new magnet array design has the scalability to be extended to various sizes of motor and is especially suitable for small air gap applications.

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