Permalloy-Based Thin Film Structures: Magnetic Properties and the Giant Magnetoimpedance Effect in the Temperature Range Important for Biomedical Applications

This work describes the possibility of fabrication of the large batches of magnetic nanoparticles using electrophysical methods of electric explosion of the wire, laser target evaporation and spark discharge. Bioapplications of nanoparticles require the production of magnetic materials in the form of stabilized aqueous suspensions or hydrogels with magnetic fillers; therefore, some details of the synthesis of these materials and their certification are discussed. The peculiarities of interaction of magnetic nanoparticles with biological systems, the problem of biocompatibility, the possibility of using ferrogel substrates for the needs of cell technologies and regenerative medicine, as well as implication of biomimetics in the development of magnetic biosensors are considered. The results of the analysis of a number of different biological experiments carried out with suspensions of various types, obtained based on the same batch of MNPs are presented. An analysis of examples of magnetic biodetection and existing theoretical approaches will make it possible to assess the prospects of this scientific direction for the creation of highly sensitive thin film sensors based on the giant magnetoimpedance effect for biomedical applications

Download Full-text

Scattering of Microwaves by a Passive Array Antenna Based on Amorphous Ferromagnetic Microwires for Wireless Sensors with Biomedical Applications

Sensors ◽

10.3390/s19143060 ◽

2019 ◽

Vol 19 (14) ◽

pp. 3060

Author(s):

Alberto Moya ◽

Diego Archilla ◽

Elena Navarro ◽

Antonio Hernando ◽

Pilar Marín

Keyword(s):

Biomedical Applications ◽

High Sensitivity ◽

Bias Field ◽

Giant Magnetoimpedance ◽

Scattering Parameter ◽

Giant Magnetoimpedance Effect ◽

Radiation Theory ◽

Temperature Detector ◽

Frequency Sweeps ◽

Amorphous Microwires

Co-based amorphous microwires presenting the giant magnetoimpedance effect are proposed as sensing elements for high sensitivity biosensors. In this work we report an experimental method for contactless detection of stress, temperature, and liquid concentration with application in medical sensors using the giant magnetoimpedance effect on microwires in the GHz range. The method is based on the scattering of electromagnetic microwaves by FeCoSiB amorphous metallic microwires. A modulation of the scattering parameter is achieved by applying a magnetic bias field that tunes the magnetic permeability of the ferromagnetic microwires. We demonstrate that the OFF/ON switching of the bias activates or cancels the amorphous ferromagnetic microwires (AFMW) antenna behavior. We show the advantages of measuring the performing time dependent frequency sweeps. In this case, the AC-bias modulation of the scattering coefficient versus frequency may be clearly appreciated. Furthermore, this modulation is enhanced by using arrays of microwires with an increasing number of individual microwires according to the antenna radiation theory. Transmission spectra show significant changes in the range of 3 dB for a relatively weak magnetic field of 15 Oe. A demonstration of the possibilities of the method for biomedical applications is shown by means of wireless temperature detector from 0 to 100 °C.

Download Full-text

Magnetic properties and giant magnetoimpedance effect of FINEMET/Fe50Pt50 composite ribbons

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2020.167080 ◽

2020 ◽

Vol 513 ◽

pp. 167080

Author(s):

Y.B. Guo ◽

J.T. Zou ◽

X. Li ◽

W.H. Xie ◽

Z.J. Zhao

Keyword(s):

Magnetic Properties ◽

Giant Magnetoimpedance ◽

Giant Magnetoimpedance Effect

Download Full-text

Soft magnetic properties and giant magnetoimpedance effect in thermally annealed amorphous Co68Fe4Cr3Si15B10 alloy ribbons

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2015.03.086 ◽

2015 ◽

Vol 638 ◽

pp. 233-238 ◽

Cited By ~ 14

Author(s):

Wei Lu ◽

Yewen Xu ◽

Jindan Shi ◽

Yiming Song ◽

Xiang Li

Keyword(s):

Magnetic Properties ◽

Soft Magnetic Properties ◽

Soft Magnetic ◽

Giant Magnetoimpedance ◽

Giant Magnetoimpedance Effect

Download Full-text

Optimization of Magnetic Properties and Giant Magnetoimpedance Effect in Nanocrystalline Microwires

Journal of Superconductivity and Novel Magnetism ◽

10.1007/s10948-014-2654-5 ◽

2014 ◽

Vol 28 (3) ◽

pp. 813-822 ◽

Cited By ~ 9

Author(s):

A. Zhukov ◽

A. Talaat ◽

M. Ipatov ◽

J. J. del Val ◽

L. Gonzalez-Legarreta ◽

...

Keyword(s):

Magnetic Properties ◽

Giant Magnetoimpedance ◽

Giant Magnetoimpedance Effect

Download Full-text

Optimization of magnetic properties and GMI effect of Thin Co-rich Microwires for GMI Microsensors

Sensors ◽

10.3390/s20061558 ◽

2020 ◽

Vol 20 (6) ◽

pp. 1558 ◽

Cited By ~ 4

Author(s):

Lorena Gonzalez-Legarreta ◽

Paula Corte-Leon ◽

Valentina Zhukova ◽

Mihail Ipatov ◽

Juan Maria Blanco ◽

...

Keyword(s):

Magnetic Properties ◽

Magnetic Anisotropy ◽

Hysteresis Loops ◽

Transverse Magnetic ◽

Wide Frequency Range ◽

Soft Magnetic ◽

Giant Magnetoimpedance ◽

Giant Magnetoimpedance Effect ◽

Annealing Temperatures ◽

High Annealing

Magnetic microwires can present excellent soft magnetic properties and a giant magnetoimpedance effect. In this paper, we present our last results on the effect of postprocessing allowing optimization of the magnetoimpedance effect in Co-rich microwires suitable for magnetic microsensor applications. Giant magnetoimpedance effect improvement was achieved either by annealing or stress-annealing. Annealed Co-rich presents rectangular hysteresis loops. However, an improvement in magnetoimpedance ratio is observed at fairly high annealing temperatures over a wide frequency range. Application of stress during annealing at moderate values of annealing temperatures and stress allows for a remarkable decrease in coercivity and increase in squareness ratio and further giant magnetoimpedance effect improvement. Stress-annealing, carried out at sufficiently high temperatures and/or stress allowed induction of transverse magnetic anisotropy, as well as magnetoimpedance effect improvement. Enhanced magnetoimpedance ratio values for annealed and stress-annealed samples and frequency dependence of the magnetoimpedance are discussed in terms of the radial distribution of the magnetic anisotropy. Accordingly, we demonstrated that the giant magnetoimpedance effect of Co-rich microwires can be tailored by controlling the magnetic anisotropy of Co-rich microwires, using appropriate thermal treatment.

Download Full-text