GIANT MAGNETOIMPEDANCE EFFECT IN MULTILAYERED STRUCTURE (FM/SiO2)3/Ag/(SiO2/FM)3 FILMS

2005 ◽  
Vol 19 (30) ◽  
pp. 4475-4482
Author(s):  
WEI-PING CHEN ◽  
SHU-QIN XIAO ◽  
WEN-JING WANG ◽  
HUI-MIN YUAN ◽  
YI-HUA LIU
Keyword(s):  
Magnetic Field ◽  
Deposition Process ◽  
Transverse Magnetic ◽  
Multilayered Structure ◽  
Giant Magnetoimpedance ◽  
Multilayered Films ◽  
Giant Magnetoimpedance Effect ◽  
Radio Frequency Sputtering ◽  
Maximum Value ◽  
Different Temperatures

Giant magnetoimpedance (GMI) and giant magnetoreactance (GMX) effects in multilayered structure ( FM/SiO 2)3/ Ag /( SiO 2/ FM )3( FM ≡ Fe 71.5 Cu 1 Cr 2.5 V 4 Si 12 B 9) films have been studied. The multilayered films were deposited by radio frequency sputtering under a constant magnetic field of 900 Oe applied in the plane of the sample perpendicular to its long side (transverse direction) and then annealed under different temperatures. The maximum GMI ratio of 122% was obtained at the frequency of 4.6 MHz. The maximum value of GMX ratio and the sensitivity of GMX ratio, 2578% and 129%/Oe, were obtained in a longitudinal field case at the frequency of 1 MHz, respectively. These superior properties are related to the special structure of the multilayered films and the transverse magnetic field used in the deposition process.

scholarly journals Магнитный импеданс пленочных наноструктур для оценки полей рассеяния микрочастиц магнитных композитов

2022 ◽  
Vol 92 (2) ◽  
pp. 321
Author(s):  
Г.Ю. Мельников ◽  
В.Н. Лепаловский ◽  
Г.В. Курляндская
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Composite ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Magnetic Microparticles ◽  
Stray Magnetic Field ◽  
Weight Concentration ◽  
Maximum Value ◽  
Film Element

Longitudinal giant magnetoimpedance effect of [Fe21Ni79/Cu]5/Cu/[Fe21Ni79/Cu]5 film element was investigated depends on stray magnetic field of epoxy magnetic composite with 30 % weight concentration of iron oxide magnetic microparticles. Configuration of an experiment was a model of thrombus detection in a blood vessel. Stray magnetic field was varied by movement of a magnetic composite above the element perpendicular to the long side. Composite was either magnetized or not to the state of remanence. As the magnetic composite approaches the GMI element, MI ratio curves are smoothed and shifted along the field axis and maximum value of the MI ratio decreases. Magnetic properties of magnetic composite and film element were investigated as well.

Anisotropic Co-Hf Thin Films for Micro-Sensors and Micro-Transducers

2015 ◽  
Vol 644 ◽  
pp. 65-69
Author(s):  
V. Madurga ◽  
C. Favieres ◽  
J. Vergara
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Transverse Direction ◽  
Anisotropy Field ◽  
Transverse Magnetic ◽  
Glancing Angle Deposition ◽  
Maximum Value ◽  
Easy Direction ◽  
Glancing Angle ◽  
Angle Deposition

Thin films of Co-Hf (≈ 86-14 % at.) were grown over Si micro-cantilevers using a glancing-angle deposition technique. A controlled easy direction of magnetisation (anisotropy field μoHk ≈ 0.1 T) in the longitudinal or in the transverse direction of the micro-cantilevers was generated. The mechanical properties of the films under the action of a magnetic field were opposite depending on the magnetisation’s easy direction: i) their deflection was either zero or the maximum value depending on the direction of the applied magnetic field with respect to the parallel or transverse easy direction of magnetisation; ii) the shift in the resonance frequency under a longitudinal or transverse magnetic field was also different depending on the longitudinal or transverse easy direction of magnetisation. The use of these coated devices with micromagnet-like films for sensors and transducers is discussed.

The Bias-Controlled Magnetoimpedance Effect in a MIS Structure

2015 ◽  
Vol 233-234 ◽  
pp. 451-455
Author(s):  
Dmitry A. Smolyakov ◽  
Anton S. Tarasov ◽  
Arthur O. Gustaitsev ◽  
Nikita V. Volkov
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Mis Structure ◽  
Giant Magnetoimpedance ◽  
Metal Insulator ◽  
Giant Magnetoimpedance Effect ◽  
The Real ◽  
Mis Diode ◽  
The Magnetic Field ◽  
Pronounced Peak

We report the giant magnetoimpedance effect in a ferromagnetic metal/insulator/semiconductor (MIS) diode with the Schottky barrier based on the Fe/SiO2/n-Si structure. It was established that the applied magnetic field strongly influences the impedance of the structure in the temperature range 10—30 K. In this range, there is the pronounced peak in the temperature dependence of the real part of the impedance at frequencies from 10 Hz to 1 MHz. The effect of the magnetic field manifests itself as a shift of the peak of the real part of the impedance. Under the action of a bias voltage of 5 V, the peak of the real part of the impedance similarly shifts toward lower temperatures with and without applied magnetic field.

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

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1558 ◽  
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.

Giant magnetoimpedance effect in Co2FeAl single layered and Co2FeAl/Ag multilayered films in amorphous substrates

2015 ◽  
Vol 156 ◽  
pp. 90-93 ◽  
Author(s):  
A.M. Silva ◽  
V.M. Escobar ◽  
G.L. Callegari ◽  
K. Agra ◽  
C. Chesman ◽  
...  
Keyword(s):  
Giant Magnetoimpedance ◽  
Multilayered Films ◽  
Giant Magnetoimpedance Effect ◽  
Amorphous Substrates

Magnetic field meter based on giant magnetoimpedance effect

2008 ◽  
Vol 141 (1) ◽  
pp. 68-75 ◽  
Author(s):  
M. Kuźmiński ◽  
K. Nesteruk ◽  
H.K. Lachowicz
Keyword(s):  
Magnetic Field ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect

GIANT MAGNETOIMPEDANCE EFFECT IN AS-DEPOSITED (Fe88Zr7B5)0.97Cu0.03 AMORPHOUS FILMS

2005 ◽  
Vol 19 (21) ◽  
pp. 3405-3412
Author(s):  
WEI-PING CHEN ◽  
SHU-QIN XIAO ◽  
YI-HUA LIU
Keyword(s):  
Amorphous Film ◽  
Close Correlation ◽  
Soft Magnetic ◽  
Amorphous Films ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Gmi Effect ◽  
Radio Frequency Sputtering ◽  
Transverse Permeability ◽  
Frequency Dependences

The giant magnetoimpedance (GMI) effect has been observed in as-deposited ( Fe 88 Zr 7 B 5)0.97 Cu 0.03 amorphous film prepared by radio frequency sputtering. The maximum magnetoimpedance ratio of 17% was obtained at a frequency of 13 MHz. The field and frequency dependences of magnetoimpedance, magnetoresistance, magnetoreactance and transverse permeability have been investigated in detail. Our results show that a close correlation between longitudinal GMI and transverse permeability exists. Our results indicate that the amorphous ( Fe 88 Zr 7 B 5)0.97 Cu 0.03 films have good soft magnetic properties and remarkable GMI effect even though in the as-deposited state.

scholarly journals Study on the giant magnetoimpedance effect of FeCuCrVSiB multilayered films

2005 ◽  
Vol 54 (6) ◽  
pp. 2929
Author(s):  
Chen Wei-Ping ◽  
Xiao Shu-Qin ◽  
Wang Wen-Jing ◽  
Jiang Shan ◽  
Liu Yi-Hua
Keyword(s):  
Giant Magnetoimpedance ◽  
Multilayered Films ◽  
Giant Magnetoimpedance Effect

GIANT MAGNETOIMPEDANCE BEHAVIOR IN MAGNETIC FIELD-DEPOSITED AMORPHOUS FeCuCrVSiB SINGLE AND MULTILAYERED FILMS

2010 ◽  
Vol 24 (29) ◽  
pp. 5711-5721
Author(s):  
WEI-PING CHEN ◽  
SHU-QIN XIAO ◽  
SHANG-SHEN FENG ◽  
YI-HUA LIU
Keyword(s):  
Magnetic Field ◽  
Rf Sputtering ◽  
Single Layer ◽  
Deposition Process ◽  
Film Plane ◽  
Soft Magnetic ◽  
Multilayered Films ◽  
Low Frequencies ◽  
Transverse Fields ◽  
The Magnetic Field

The magnetic and magnetoimpedance behavior of FeCuCrVSiB and ( F / SiO 2)3/ Ag /( SiO 2/ F )3( F = FeCuCrVSiB ) soft magnetic amorphous films deposited in a magnetic field have been investigated systematically. The samples were deposited by the RF sputtering with or without a static magnetic field of 900 Oe applied in the film plane. It is found that the magnetic field applied during the deposition process improves the soft magnetic properties of the sample significantly. The coercive force of the sample is about 0.8 Oe, which is much smaller than that deposited without a field. Moreover, remarkable GMI effects were obtained at relatively low frequencies, which contrasts with the samples deposited without field. In the magnetic field-deposited state, the maximum GMI ratios of 21.5% and 19.5% were achieved for the single-layer films in longitudinal and transverse fields at a frequency of 13 MHz, while for the multilayered films, the maximum values of longitudinal and transverse GMI ratios are 45% and 44% at a frequency of 6.81 MHz, respectively. These superior GMI behaviors of the as-deposited films are related to the magnetic field used in the preparation process and the inserted SiO 2 layers.

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