Comparison between ac and dc current annealing in CoFeSiB glass-covered amorphous microwires

2007 ◽  
Vol 40 (10) ◽  
pp. 3233-3238 ◽  
Author(s):  
K D Sossmeier ◽  
F Bohn ◽  
H Chiriac ◽  
M Carara
Keyword(s):  
Current Annealing ◽  
Amorphous Microwires ◽  
Dc Current

Study of Stress Annealing on Giant Magneto-Impedance in Glass-Covered Co-Based Amorphous Microwires

2012 ◽  
Vol 174-177 ◽  
pp. 1119-1121 ◽  
Author(s):  
Bin Tian ◽  
Yin Li Xia
Keyword(s):  
Applied Stress ◽  
Annealing Process ◽  
Transverse Anisotropy ◽  
Gmi Effect ◽  
Amorphous Wires ◽  
Outer Domain ◽  
Giant Magneto Impedance ◽  
Current Annealing ◽  
Amorphous Microwires ◽  
Dc Current

The glass-covered Co-rich amorphous wires was annealed by an applied stress during the current annealing process. The influence of stress and dc current annealing on the giant magneto-impedance (GMI) effect were investigated by the magneto-impedance. Our experiments showed that the magentic anisotropy is reduced by the annealing treatments, furthermore, the maximum GMI value is increased to 105 %.The GMI value is enhanced by increasing the outer domain volume and inducing a transverse anisotropy due to the changing of inner stress.

Influence of Current Annealing on the Temperature Dependences of Magnetoimpedance in Amorphous Microwires

2019 ◽  
Vol 64 (7) ◽  
pp. 990-993
Author(s):  
A. Dzhumazoda ◽  
L. V. Panina ◽  
M. G. Nematov ◽  
N. A. Yudanov ◽  
F. S. Tabarov ◽  
...  
Keyword(s):  
Temperature Dependences ◽  
Current Annealing ◽  
Amorphous Microwires

Giant Magnetoimpedance Effect in a Co-Based Microwire for Quick-Response Magnetic Sensor Applications

Volume 3 ◽  
2004 ◽  
Author(s):  
Manh-Huong Phan ◽  
Hua-Xin Peng ◽  
Michael R. Wisnom ◽  
Seong-Cho Yu
Keyword(s):  
Giant Magnetoimpedance ◽  
New Approach ◽  
Giant Magnetoimpedance Effect ◽  
Sensor Applications ◽  
Sensing Applications ◽  
Stress Sensors ◽  
Field Sensitivity ◽  
Amorphous Microwires ◽  
Dc Current ◽  
Linear Field

Development of autobiased linear field sensors based on asymmetrical giant magnetoimpedance (AGMI) effect in Corich amorphous microwires upon the application of a biasing dc current is approached. Upon biasing dc currents, the highest field sensitivity of AGMI of 20%/Oe was found at a biasing dc current of 10 mA. The reduction of the AGMI under a biasing dc current of 25 mA and a frequency of 10 MHz has been observed. The result indicates that an optimum design of autobiased linear field sensors based on AGMI can be achieved by applying the biasing dc current of 10 mA and in the frequency range of 100 kHz–5 MHz. A stress-induced change in AGMI has also been found in these microwires and this offers a new approach to the development of stress sensors. All these features make the Co-rich amorphous microwire a multifunctional and smart material that can be used for different purposes of sensing applications.

Influence of the DC Current Annealing Treatment on Magnetotransport Properties of Soft-Magnetic Alloys with Amorphous Precursors

2006 ◽  
Vol 518 ◽  
pp. 313-318 ◽  
Author(s):  
N. Mitrović ◽  
Stefan Roth ◽  
S. Kane
Keyword(s):  
Structural Changes ◽  
Annealing Treatment ◽  
Nanocrystalline Structure ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Soft Magnetic Alloys ◽  
On Line ◽  
Current Annealing ◽  
Dc Current

Multistep current annealing (CA) treatments were performed on amorphous FINEMETtype Fe-Cu-V-Si-B, as well as on a novel Fe-Al-Ga-P-C-B alloy with a large supercooled liquid region, in order to optimize their magnetotransport properties. On-line and post-annealing electrical resistivity measurements, DSC, XRD and Mössbauer spectroscopy were used for characterization of structural changes evolved during CA treatments. Results on magnetoresistance (MR) and magnetoimpedance (MI) effects after CA in ribbon samples with relaxed amorphous as well as precipitated nanocrystalline structure are presented. Significant improvement in MI-response after CA up to Z/Z ≈ 50% was recorded at frequencies 2-3 MHz. The highest MI-element sensitivity was found for low magnetic field intensity where values of about 6 %/kA/m for samples of Fe-Al- Ga-P-C-B alloy were attained.

Magnetostriction of glass-coated Co-rich amorphous microwires and its dependence on current annealing

2003 ◽  
Vol 254-255 ◽  
pp. 94-96 ◽  
Author(s):  
V Zhukova ◽  
J.M Blanco ◽  
A Zhukov ◽  
J Gonzalez ◽  
A Torcunov ◽  
...  
Keyword(s):  
Current Annealing ◽  
Amorphous Microwires

scholarly journals Stress Effects on Magnetic Properties of Amorphous Microwires Subjected to Current Annealing

2018 ◽  
Vol 185 ◽  
pp. 04030 ◽  
Author(s):  
Makhsudsho G. Nematov ◽  
Nicolay A. Yudanov ◽  
Rodion A. Yakubtsev ◽  
Larissa V. Panina ◽  
Anna V. Beklemisheva ◽  
...  
Keyword(s):  
Magnetic Hysteresis ◽  
Microwave Frequency ◽  
Nominal Composition ◽  
High Frequency Region ◽  
Stress Effects ◽  
Stress Sensors ◽  
Directional Change ◽  
Current Annealing ◽  
Amorphous Microwires ◽  
Helical Anisotropy

Effects of current annealing on magnetic hysteresis properties and magnetoimpedance (MI) of glass-coated amorphous microwires with nominal composition of Co71Fe5B11Si10Cr3 and small positive magnetostriction were investigated with the purpose to control the magnetic anisotropy. We have demonstrated that current annealing can produce a controllable change in the easy anisotropy direction from almost axial to circular, depending on the annealing time. The induced magnetization configuration is very sensitive to the applied tensile stress. The combination of positive magnetostriction and helical anisotropy makes it possible to realise large stress-magnetoimpedance (S-MI) effect without use of any dc bias fields owing to the directional change in magnetization. This is especially important for microwave frequency S-MI effect and can be very interesting for developing stress-sensors operating at the high frequency region.

Magnetic Properties and the Giant Magneto-Impedance in Joule-Heated Glass-Covered Co-Based Microwire

2009 ◽  
Vol 79-82 ◽  
pp. 1407-1410 ◽  
Author(s):  
B. Tian ◽  
L.H. Wang ◽  
L.Y. Zhou
Keyword(s):  
Magnetic Properties ◽  
Induced Anisotropy ◽  
Soft Magnetic ◽  
Applied Current ◽  
Giant Magnetoimpedance ◽  
Maximum Slope ◽  
Giant Magnetoimpedance Effect ◽  
Amorphous Microwires ◽  
Dc Current ◽  
Heated Glass

The influence of DC current annealing on magnetic properties and the frequency dependence in the range from 0.1 to 20 MHz of the giant magnetoimpedance effect (GMI) of glass-covered amorphous microwires were investigated. Under a certain annealing condition (10 min annealing with applied current Ia=110 mA), the maximum change of impedance was about 200% with a maximum slope sensitivity of 0.26%/Am-1 . Further treatment with increased current resulted in a decrease of the maximum MI ratio. Meanwhile, annealing can produce short-range order relaxation and consequently improves the sample's soft magnetic properties. We also found that the GMI ratio increased due to the enhanced induced anisotropy with increasing current under the same Joule energy.

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