An investigation of soft magnetic and non magnetic materials under low frequency (original) (raw)
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An Investigation on Soft Magnetic and Non Magnetic Materials Under Low Frequency
The recent development of magnetic sensors in biomedical sector has called for urgent investigation on the characterization and relative magnetism of magnetic and nonmagnetic materials. This paper proposes a novel technique to categorize the magnetic and non-magnetic materials by obtaining their impedance peaks. The magnetization effect of a magneto-inductive sensor was detected in low frequency range for different magnetic and nonmagnetic core materials. The distinctive impedance peak values have been obtained for each materials used as core which result in showing different magneto-inductive effect. The results have shown a dominant behaviour of magnetic materials over non-magnetic materials due to the variation of permeability and magnetic strength (number of turns). Moreover, variations in permeability originated by the applied alternative current field results in changing the depth (insertion depth) and also in the impedance. The influence of the permeability on materials with ...
Magnetization behavior of soft magnetic materials for sensor applications
2011
This paper presents a magnetic characterization technique based on the analysis of respective magnetization curves of the soft ferrites materials under test. The magnetic properties in low external magnetic field are explored for those materials. The method applies an alternating electric current through the coil to magnetize the ferromagnetic materials used as a core. Due to the change in current, the changes in the primary coil result in changing the magnetic field and the magnetic flux. An op-amp acting as a voltage integrator is used in the circuit, connected to the secondary winding. Several experiments were conducted to obtain desired hysteresis loops. These results show the changes due to variation of magnetism; hence one can decide on the comparative values of magnetic parameters for each sample tested. Moreover, the obtained hysteresis loops are evaluated to be comfortably used for the application in magneto resistive applications, magneto-resistive sensors and for a wide range of biomedical equipment items.
Characterization of soft ferromagnetic materials by inductance spectroscopy and magnetoimpedance
Journal of Magnetism and Magnetic Materials, 2005
Inductance spectroscopy and magnetoimpedance are extremely sensitive to a wide variety of intrinsic and extrinsic magnetic properties of soft magnetic materials; as a result, they can be used as a characterization tool. In this paper, the basic principles underpinning these magnetic phenomena are briefly discussed. The use of equivalent circuits is presented, as well as the correlations between the elements of such circuits and the relevant physical parameters of materials. Some specific cases are discussed. r
2014
The outstanding properties of selected soft magnetic materials make them successful candidates for building high performance sensors. In this paper we present our recent work regarding different sensing technologies based on the coupling of the magnetic properties of soft magnetic materials with their electric or elastic properties. In first place we report the influence on the magneto-impedance response of the thickness of Permalloy films in multilayer-sandwiched structures. An impedance change of 270% was found in the best conditions upon the application of magnetic field, with a low field sensitivity of 140%/Oe. Second, the magneto-elastic resonance of amorphous ribbons is used to demonstrate the possibility of sensitively measuring the viscosity of fluids, aimed to develop an on-line and real-time sensor capable of assessing the state of degradation of lubricant oils in machinery. A novel analysis method is shown to sensitively reveal the changes of the damping parameter of the magnetoelastic oscillations at the resonance as a function of the oil viscosity. Finally, the properties and performance of magneto-electric
Sensors (Basel, Switzerland), 2014
The outstanding properties of selected soft magnetic materials make them successful candidates for building high performance sensors. In this paper we present our recent work regarding different sensing technologies based on the coupling of the magnetic properties of soft magnetic materials with their electric or elastic properties. In first place we report the influence on the magneto-impedance response of the thickness of Permalloy films in multilayer-sandwiched structures. An impedance change of 270% was found in the best conditions upon the application of magnetic field, with a low field sensitivity of 140%/Oe. Second, the magneto-elastic resonance of amorphous ribbons is used to demonstrate the possibility of sensitively measuring the viscosity of fluids, aimed to develop an on-line and real-time sensor capable of assessing the state of degradation of lubricant oils in machinery. A novel analysis method is shown to sensitively reveal the changes of the damping parameter of the magnetoelastic oscillations at the resonance as a function of the oil viscosity. Finally, the properties and performance of magneto-electric
Micromagnetic field sensor of soft magnetic alloys based on the magnetoimpedance effect
Recently, sensitive micromagnetic sensors have been required to grade up technologies for automation, motorization, computerization, and bioengineering through intelligent measurement and control systems. Magnetoimpedance has been a topic of intensive research since its discovery [1] due to its perspective applications in recording heads and sensors [2]. Magnetoimpedance is a variation of the ac impedance of a magnetic conductor when submitted to a static magnetic field, and it has a classical electromagnetic origin related to changes in the dynamics of the magnetization process. Such changes affect the magnetic permeability and consequently, the penetration depth of the ac current through the magnetic conductor with increasing frequencies [3]. A new sensitive micromagnetic field sensor has been proposed in this project. Magnetoimpedance in amorphous alloy with cross anisotropy has been used for the development of a low noise, sensitive and quick response miniature magnetic sensor. ...
Quantitative Evaluation for Magnetoelectric Sensor Systems in Biomagnetic Diagnostics
Sensors, 2022
Dedicated research is currently being conducted on novel thin film magnetoelectric (ME) sensor concepts for medical applications. These concepts enable a contactless magnetic signal acquisition in the presence of large interference fields such as the magnetic field of the Earth and are operational at room temperature. As more and more different ME sensor concepts are accessible to medical applications, the need for comparative quality metrics significantly arises. For a medical application, both the specification of the sensor itself and the specification of the readout scheme must be considered. Therefore, from a medical user’s perspective, a system consideration is better suited to specific quantitative measures that consider the sensor readout scheme as well. The corresponding sensor system evaluation should be performed in reproducible measurement conditions (e.g., magnetically, electrically and acoustically shielded environment). Within this contribution, an ME sensor system ev...
This manuscript presents the development of a low intensity magnetic field transducer, based on the Giant Magnetoimpedance (GMI) effect, to be used for biomedical applications. The GMI effect is a characteristic of some ferromagnetic materials, due to which it is observed a large variation of the material impedance due to external dc magnetic fields. We describe the effect, the transducer configuration, the electronic circuits and the preliminary results obtained so far. A sensitivity comparable to a fluxgate probe has already been obtained, and the theoretical calculations indicate the possibility of further enhancing this figure of merit.
Analysis and Design of Inductive Biosensors for Magnetic Immuno Assay
imeko.org, 2009
In this paper an inductive integrated sensor for biomedical applications is investigated through analytical models and numerical simulations such to obtain an optimized device design. This biosensor addressed here is based on the use of magnetic particles that suitably coated act as markers of the bio-molecule to be detected. The sensing principle of the device is related to the magnetic
Magnetic characterization of soft magnetic materials—experiments and analysis
Journal of Magnetism and Magnetic Materials, 2003
Various kinds of magnetic measurement methods suited for soft magnetic materials are critically surveyed. Emphasis was laid on AC-susceptibility methods, the hysteresis loop and the magnetostriction. The analysis of the temperature dependence of the magnetization and the magnetostriction is demonstrated on the amorphous system Fe-Co-B. r