Magnetoimpedance of CoFeCrSiB Ribbon-Based Sensitive Element with FeNi Covering: Experiment and Modeling

Soft magnetic materials are widely requested in electronic and biomedical applications. Co-based amorphous ribbons are materials which combine high value of the magnetoimpedance effect (MI), high sensitivity with respect to the applied magnetic field, good corrosion stability in aggressive environments, and reasonably low price. Functional properties of ribbon-based sensitive elements can be modified by deposition of additional magnetic and non-ferromagnetic layers with required conductivity. Such layers can play different roles. In the case of magnetic biosensors for magnetic label detection, they can provide the best conditions for self-assembling processes in biological experiments. In this work, magnetic properties and MI effect were studied for the cases of rapidly quenched Co67Fe3Cr3Si15B12 amorphous ribbons and magnetic Fe20Ni80/Co67Fe3Cr3Si15B12/Fe20Ni80 composites obtained by deposition of Fe20Ni80 1 μm thick films onto both sides of the ribbons by magnetron sputtering technique. Their comparative analysis was used for finite element computer simulations of MI responses with different types of magnetic and conductive coatings. The obtained results can be useful for the design of MI sensor development, including MI biosensors for magnetic label detection.

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The Portable Measurement Instrument of Dynamic Magnetic Properties for the Soft Magnetic Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1004-1005.1321 ◽

2014 ◽

Vol 1004-1005 ◽

pp. 1321-1324

Author(s):

Rui Fen Hou ◽

Wen Fan ◽

Zhi Gao Zhang ◽

Wen Jie Gong ◽

An Li Lin

Keyword(s):

Magnetic Properties ◽

Magnetic Materials ◽

Sampling Method ◽

Measurement Instrument ◽

Soft Materials ◽

Soft Magnetic Materials ◽

Soft Magnetic ◽

Measurement Results ◽

Different Types ◽

Measurement Principle

The portable measurement instrument is designed and built to measure the dynamic magnetic properties of the soft magnetic materials. The measurement principle and sampling method are presented. The study shows the instrument can measure the different types of soft materials accurately at frequencies in the range of 20 Hz – 200 kHz. The standard deviations of the specific total loss (Ps) and amplitude permeability (μa) are less than 0.3%. The errors ofPsanduaare not larger than 0.3% between the measurement results of the instrument and the standard measurement device of National Institute of Metrology (NIM) of China NIM.

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Bulk soft magnetic materials from ball-milled Fe77Nb7B15Cu1 amorphous ribbons

Intermetallics ◽

10.1016/j.intermet.2008.10.002 ◽

2009 ◽

Vol 17 (1-2) ◽

pp. 79-85 ◽

Cited By ~ 12

Author(s):

J. Torrens-Serra ◽

P. Bruna ◽

S. Roth ◽

J. Rodriguez-Viejo ◽

M.T. Clavaguera-Mora

Keyword(s):

Magnetic Materials ◽

Soft Magnetic Materials ◽

Soft Magnetic ◽

Amorphous Ribbons

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MEMS Technology in the Fabrication of Fluxgate Sensor with Micro-Solenoid Cores

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.468-471.1836 ◽

2012 ◽

Vol 468-471 ◽

pp. 1836-1839

Author(s):

Jian Lei ◽

Chong Lei ◽

Yong Zhou

Keyword(s):

High Sensitivity ◽

Nanocrystalline Alloy ◽

Soft Magnetic Materials ◽

Measuring System ◽

Soft Magnetic ◽

Fluxgate Sensor ◽

Magnetic Cores ◽

Mems Technology ◽

Thick Photoresist ◽

Field Measuring

In this paper, we presented a MEMS-based method of manufacturing micro fluxgate sensors. Micro-solenoid coils acting as excitation and sensing elements of the sensors were fabricated by MEMS technology and thick photoresist-based UV-lithography. Different processes were used to fabricate the magnetic cores made of different soft magnetic materials, respectively. Permalloy core was formed by electroplating, whereas gluing and chemical wet etching were adopted in the fabrication of the nanocrystalline alloy core. The two micro fluxgate sensors were characterized by a magnetic field measuring system. The experimental results showed that the micro fluxgate sensors possess high sensitivity, wide linear measuring range and low power consumption.

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A Model for the Hysteresis Curves of Soft Magnetic Materials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.727-728.130 ◽

2012 ◽

Vol 727-728 ◽

pp. 130-134 ◽

Cited By ~ 7

Author(s):

Fernanda A. Sampaio da Silva ◽

Marcos Flavio de Campos

Keyword(s):

Experimental Data ◽

Magnetic Materials ◽

Soft Magnetic Materials ◽

Magnetization Curves ◽

Soft Magnetic ◽

Hyperbolic Tangent ◽

Iron Powders ◽

Different Types ◽

1045 Steel ◽

Sigmoid Shape

A model, based on hyperbolic tangent curve, was found to be able to reproduce several different types of magnetization curves of soft magnetic materials. The model is especially suitable for curves with sigmoid shape. The model is compared with experimental data for bonded soft iron powders, and also other ferromagnetic materials (1045 steel). Three adjusting parameters were used in the original hyperbolic tangent equation. Each parameter has different physical meaning.

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A study on the Microstructures and the Suppression of Grain Growth in Rapidly Solidified Fe-Si-B(-Cu-Zr-Ca) Base Nanostructured Alloys

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2020.58.9.633 ◽

2020 ◽

Vol 58 (9) ◽

pp. 633-638

Author(s):

Hyun Ah Im ◽

Jun Young Jeong ◽

Su Bong An ◽

Keun Young Sohn ◽

Won-Wook Park

Keyword(s):

Grain Boundaries ◽

Grain Growth ◽

High Frequency ◽

Eddy Currents ◽

Soft Magnetic Materials ◽

Wireless Power ◽

Soft Magnetic ◽

Amorphous Ribbons ◽

Heat Treated ◽

Rapidly Solidified

Magnetic induction and resonance wireless power charging generally operates in a high frequency range, and its efficiency is degraded by the generation of heat at high frequency. This makes it necessary to develop new soft magnetic materials capable of maintaining their characteristics even at high frequency. The purpose of this study is to minimize the heat generated by the eddy currents when charging, and to improve the charging efficiency under an alternating magnetic field. In this study, Fe-Si-B alloys containing Cu, Zr and Ca elements were melt-spun to prepare amorphous ribbons. The amorphous ribbons were heat treated to crystallize nanograins, The structure was analyzed by TEM and EELS, As a result, it was found that Zr was distributed mainly at the grain boundaries after heat treatment, whereas Ca was uniformly distributed only along the grain boundaries. It could be concluded that the Ca and Zr elements effectively suppressed the grain growth, and thus maintained the very fine nanograin structure.

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Backscattered Electron Imaging of GaAs/AlGaAs Super Lattice Structures with an Ultra-High- Resolution SEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100103103 ◽

1988 ◽

Vol 46 ◽

pp. 204-205

Author(s):

Kazumichi Ogura ◽

Michael M. Kersker

Keyword(s):

High Resolution ◽

Layer Structure ◽

High Sensitivity ◽

Beam Current ◽

Electron Beam Current ◽

Lattice Structures ◽

Super Lattice ◽

Different Types ◽

Backscattered Electron ◽

Electron Imaging

Backscattered electron (BE) images of GaAs/AlGaAs super lattice structures were observed with an ultra high resolution (UHR) SEM JSM-890 with an ultra high sensitivity BE detector. Three different types of super lattice structures of GaAs/AlGaAs were examined. Each GaAs/AlGaAs wafer was cleaved by a razor after it was heated for approximately 1 minute and its crosssectional plane was observed.First, a multi-layer structure of GaAs (100nm)/AlGaAs (lOOnm) where A1 content was successively changed from 0.4 to 0.03 was observed. Figures 1 (a) and (b) are BE images taken at an accelerating voltage of 15kV with an electron beam current of 20pA. Figure 1 (c) is a sketch of this multi-layer structure corresponding to the BE images. The various layers are clearly observed. The differences in A1 content between A1 0.35 Ga 0.65 As, A1 0.4 Ga 0.6 As, and A1 0.31 Ga 0.69 As were clearly observed in the contrast of the BE image.

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