scholarly journals Angle Magnetization Rotation Method for Characterizing Co-Rich Amorphous Ferromagnetic Microwires

Actuators ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 93
Author(s):  
Sergey Gudoshnikov ◽  
Yury Grebenshchikov ◽  
Anastasya Popova ◽  
Vadim Tarasov ◽  
Evgeny Gorelikov ◽  
...  

A low-frequency model of the magnetization reversal of a microwire is developed for those cases when the microwire magnetization response can go beyond the linear approximation. The analysis of the influence of external magnetic fields on the process of magnetization reversal of the microwire, including the hysteresis mode, was performed. The characteristic dependences of the amplitude of the electromotive force, U2f, arising in the pick-up coil wound around the microwire are obtained. It was established that, in the region of relatively small-acting circular and longitudinal magnetic fields, the U2f signal could have a region with the opposite sign. An extended small-angle magnetization rotation method was used to verify the proposed model and test glass-coated, amorphous, Co-rich microwires. During the experiments, the amplitude of the second harmonic, U2f, arising in the pick-up coil when an alternating electric current with the frequency f flows through the microwire, was measured as a function of the applied longitudinal magnetic field at various mechanical tensile stresses. The effective anisotropy field, the magnetostriction constant, and the residual quenching stress of the investigated microwires were determined by comparing the theoretical and experimental data.

Author(s):  
P. A. Marsh ◽  
T. Mullens ◽  
D. Price

It is possible to exceed the guaranteed resolution on most electron microscopes by careful attention to microscope parameters essential for high resolution work. While our experience is related to a Philips EM-200, we hope that some of these comments will apply to all electron microscopes.The first considerations are vibration and magnetic fields. These are usually measured at the pre-installation survey and must be within specifications. It has been our experience, however, that these factors can be greatly influenced by the new facilities and therefore must be rechecked after the installation is completed. The relationship between the resolving power of an EM-200 and the maximum tolerable low frequency interference fields in milli-Oerstedt is 10 Å - 1.9, 8 Å - 1.4, 6 Å - 0.8.


1998 ◽  
Vol 168 (07) ◽  
pp. 767-791 ◽  
Author(s):  
N.G. Ptitsyna ◽  
G. Villoresi ◽  
L.I. Dorman ◽  
N. Iucci ◽  
Marta I. Tyasto

2015 ◽  
Vol 14 (1) ◽  
pp. 7-15
Author(s):  
Dae-kwan Jung ◽  
◽  
Joon-sig Jung ◽  
Kyu-mok Lee ◽  
Hyung-kyu Park ◽  
...  

Author(s):  
Grace X Chen ◽  
Andrea’t Mannetje ◽  
Jeroen Douwes ◽  
Leonard H Berg ◽  
Neil Pearce ◽  
...  

Abstract In a New Zealand population-based case-control study we assessed associations with occupational exposure to electric shocks, extremely low-frequency magnetic fields (ELF-MF) and motor neurone disease using job-exposure matrices to assess exposure. Participants were recruited between 2013 and 2016. Associations with ever/never, duration, and cumulative exposure were assessed using logistic regression adjusted for age, sex, ethnicity, socioeconomic status, education, smoking, alcohol consumption, sports, head or spine injury and solvents, and mutually adjusted for the other exposure. All analyses were repeated stratified by sex. An elevated risk was observed for having ever worked in a job with potential for electric shocks (odds ratio (OR)=1.35, 95% confidence interval (CI): 0.98, 1.86), with the strongest association for the highest level of exposure (OR=2.01, 95%CI: 1.31, 3.09). Analysis by duration suggested a non-linear association: risk was increased for both short-duration (<3 years) (OR= 4.69, 95%CI: 2.25, 9.77) and long-duration in a job with high level of electric shock exposure (>24 years; OR=1.88; 95%CI: 1.05, 3.36), with less pronounced associations for intermediate durations. No association with ELF-MF was found. Our findings provide support for an association between occupational exposure to electric shocks and motor neurone disease but did not show associations with exposure to work-related ELF-MF.


2000 ◽  
Vol 20 (4) ◽  
pp. 259-264 ◽  
Author(s):  
J. H. Jeong ◽  
K. B. Choi ◽  
B. C. Yi ◽  
C. H. Chun ◽  
K.-Y. Sung ◽  
...  

2007 ◽  
Vol 417 (2) ◽  
pp. 212-216 ◽  
Author(s):  
Simona Carrubba ◽  
Clifton Frilot ◽  
Andrew L. Chesson ◽  
Andrew A. Marino

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