Development of Fluxgate Magnetometers Based on Fe61Co19Si5B15 Amorphous Ribbons

2014 ◽  
Vol 605 ◽  
pp. 697-700
Author(s):  
Sotiria Vaitsi
Keyword(s):  
Magnetic Field ◽  
Magnetic Core ◽  
Field Variable ◽  
Experimental Characterization ◽  
Dc Voltage ◽  
Amorphous Ribbons ◽  
Different Types ◽  
The Magnetic Field

This paper deals with the characterization of fluxgate magnetometers that adopt a Fe61Co19Si5B15 ribbons as magnetic core. The experimental characterization concerned the dependence of Δt and ΔV according to the magnetic field Hdc. The change of the field (variable input) held by changing the offset, adding a small dc voltage to ac, taking in extremely important results. Still, examined the dependence of ΔV on the frequency for two different types of coils, a circular and an oval coil, made of the same material, Fe61Co19Si5B15.

Experimental Droplet Formation of Magnetostrictive Inkjet Head to the Change of Driving Waveform

2011 ◽  
Vol 314-316 ◽  
pp. 2334-2337
Author(s):  
Jae Hyun Yoo ◽  
Young Woo Park ◽  
Kyung Hyun Yoon ◽  
Eun Ju Yoo
Keyword(s):  
Magnetic Field ◽  
Constant Magnetic Field ◽  
Fluid Flows ◽  
Droplet Formation ◽  
Experimental Characterization ◽  
Droplet Volume ◽  
Waveform Control ◽  
Different Types ◽  
Driving Waveform

This paper presents the experimental characterization of droplet formation in accordance with different types of driving waveform. The objective of the experiments is to generate sound droplets with a minimal volume depending on the types of driving waveform. For it, two types of driving waveform are used to investigate the droplet formation of the M-Jet: one is bipolar and another W-shaped. In the case of the bipolar waveform, ti lead to fluid flows from the liquid reservoir into the chamber in the M-Jet and th is time to impose a pulse under the constant magnetic field, resulting in the formation of the droplets. The droplet volume decreases as ti increases, and increases with further increase of ti. The threshold ti is equal to 500 s. The droplet volume decreases as th decreases, but the droplet formation was not successful at less than 550 s. In the case of the W-shaped waveform, maintains ti and th where is set from bipolar waveform, control the tr, where retracted MM keeps to control droplet volume. The tail becomes longer as tr increases. The droplet volume remains nearly constant as tr increases, but rapidly increases with further increase of tr. When the two driving waveform, the W-shaped driving waveform seems to be effective in reducing the droplet volume, and achieves the reduction of volume by 30 percent.

A mechanical characterization of electroconductive magnetorheological elastomer and semi-analytical modeling of magnetic force

2019 ◽  
Vol 33 (25) ◽  
pp. 1950290
Author(s):  
Salah Aguib ◽  
Abdelkader Nour ◽  
Toufik Djedid
Keyword(s):  
Magnetic Field ◽  
Magnetic Force ◽  
Magnetic Field Intensity ◽  
Experimental Characterization ◽  
Iron Particles ◽  
Magnetorheological Elastomer ◽  
Magnetorheological Elastomers ◽  
Global Industry ◽  
The Magnetic Field

Materials with novel properties and compounds of intelligent material combinations are a key to innovation in various successful sectors of the global industry as well as for its export. Magnetorheological elastomer materials have interesting physical properties; most of these properties are modified and adapted under the influence of external parameters such as the magnetic field. In this work, an experimental characterization of the magnetorheological elastomers (MRE) loaded with 20% of the iron particles was made. The results showed that the properties of these materials can be modified very selectively and reversibly under the influence of magnetic field, where the stiffness of the material varies depending on the magnetic field intensity that influences the attractive force between iron particles.

scholarly journals Magnetic properties of cobalt microwires measured by piezoresistive cantilever magnetometry

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
G. Tosolini ◽  
J. M. Michalik ◽  
R. Córdoba ◽  
J. M. de Teresa ◽  
F. Pérez-Murano ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Room Temperature ◽  
Signal To Noise Ratio ◽  
Static Deflection ◽  
Magnetic Structures ◽  
Dual Beam ◽  
Piezoresistive Cantilevers ◽  
Good Signal ◽  
The Magnetic Field

AbstractWe present the magnetic characterization of cobalt wires grown by focused electron beam-induced deposition (FEBID) and studied using static piezoresistive cantilever magnetometry. We have used previously developed high force sensitive submicron-thick silicon piezoresistive cantilevers. High quality polycrystalline cobalt microwires have been grown by FEBID onto the free end of the cantilevers using dual beam equipment. In the presence of an external magnetic field, the magnetic cobalt wires become magnetized, which leads to the magnetic field dependent static deflection of the cantilevers. We show that the piezoresistive signal from the cantilevers, corresponding to a maximum force of about 1 nN, can be measured as a function of the applied magnetic field with a good signal to noise ratio at room temperature. The results highlight the flexibility of the FEBID technique for the growth of magnetic structures on specific substrates, in this case piezoresistive cantilevers.

Low Frequency Measurements in Amorphous Wire for Studying GMI Effect

2011 ◽  
Vol 495 ◽  
pp. 201-204
Author(s):  
Polykseni Vourna
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Major Change ◽  
Wheatstone Bridge ◽  
Amorphous Wire ◽  
Dc Voltage ◽  
Gmi Effect ◽  
Offset Voltage ◽  
Ac Current ◽  
The Magnetic Field

When a soft ferromagnetic material is flown by an ac current and a magnetic field is applied at the same time, a major change of its impedance is occurred. The aim of this paper is to investigate the influence of low frequency (1KHz-12KHz) ac current and the applied magnetic field on an amorphous magnetic wire (Co68Fe4.35Si12.5B15) without glass coating. For this purpose an experimental configuration has been setup, based on a Wheatstone bridge which receives an ac input signal from a frequency generator. The output is connected to the amorphous wire wrapped with a coil supplied by a dc voltage for the generation of the magnetic field. The output voltage pulse is measured for two cases a) The value of ac frequency is changing while the value of dc voltage applied to the coil remains constant (the magnetic field remains unchanged) and b) the magnetic field is changing while the ac frequency remains constant to a predefined value. Experimental results of the first scenario showed that when the frequency is altered a non-linear increase of the ac signal is observed at the output which shows an increase of the GMI effect and is related to the non-linearity of the wire’s permeability. For the second scenario the results showed an increase of the output signal offset (voltage) which also indicates an increase of the GMI effect.

scholarly journals Technical Note: Experimental characterization of the dose deposition in parallel MRI‐linacs at various magnetic field strengths

2019 ◽  
Vol 46 (11) ◽  
pp. 5152-5158
Author(s):  
Jarrad Begg ◽  
Sarah J. Alnaghy ◽  
Trent Causer ◽  
Thahabah Alharthi ◽  
Armia George ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Technical Note ◽  
Experimental Characterization ◽  
Parallel Mri ◽  
Dose Deposition ◽  
Field Strengths

scholarly journals Stochastic Dosimetry for the Assessment of Children Exposure to Uniform 50 Hz Magnetic Field with Uncertain Orientation

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
E. Chiaramello ◽  
S. Fiocchi ◽  
P. Ravazzani ◽  
M. Parazzini
Keyword(s):  
Magnetic Field ◽  
Central Nervous System ◽  
Nervous System ◽  
Electric Field ◽  
Stochastic Model ◽  
Significant Difference ◽  
The Central Nervous System ◽  
Children Exposure ◽  
The Magnetic Field

This study focused on the evaluation of the exposure of children aging from five to fourteen years to 50 Hz homogenous magnetic field uncertain orientation using stochastic dosimetry. Surrogate models allowed assessing how the variation of the orientation of the magnetic field influenced the induced electric field in each tissue of the central nervous system (CNS) and in the peripheral nervous system (PNS) of children. Results showed that the electric field induced in CNS and PNS tissues of children were within the ICNIRP basic restrictions for general public and that no significant difference was found in the level of exposure of children of different ages when considering 10000 possible orientations of the magnetic field. A “mean stochastic model,” useful to estimate the level of exposure in each tissue of a representative child in the range of age from five to fourteen years, was developed. In conclusion, this study was useful to deepen knowledge about the ELF-MF exposure, including the evaluation of variable and uncertain conditions, thus representing a step towards a more realistic characterization of the exposure to EMF.

Sign in / Sign up

Export Citation Format

Share Document