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.

scholarly journals Mn-Induced Thermal Stability of L10 Phase in Fept Magnetic Nanoscale Ribbons

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1278
Author(s):  
Alina Daniela Crisan ◽  
Aurel Leca ◽  
Dan Pantelica ◽  
Ioan Dan ◽  
Ovidiu Crisan
Keyword(s):  
Rare Earth ◽  
Single Phase ◽  
Permanent Magnets ◽  
Magnetic Hysteresis ◽  
Ternary Alloys ◽  
Large Temperature ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Operation Conditions

Magnetic nanoscale materials exhibiting the L10 tetragonal phase such as FePt or ternary alloys derived from FePt show most promising magnetic properties as a novel class of rare earth free permanent magnets with high operating temperature. A granular alloy derived from binary FePt with low Pt content and the addition of Mn with the nominal composition Fe57Mn8Pt35 has been synthesized in the shape of melt-spun ribbons and subsequently annealed at 600 °C and 700 °C for promoting the formation of single phase, L10 tetragonal, hard magnetic phase. Proton-induced X-ray emission spectroscopy PIXE has been utilized for checking the compositional effect of Mn addition. Structural properties were analyzed using X-ray diffraction and diffractograms were analyzed using full profile Rietveld-type analysis with MAUD (Materials Analysis Using Diffraction) software. By using temperature-dependent synchrotron X-ray diffraction, the disorder–order phase transformation and the stability of the hard magnetic L10 phase were monitored over a large temperature range (50–800 °C). A large interval of structural stability of the L10 phase was observed and this stability was interpreted in terms of higher ordering of the L10 phase promoted by the Mn addition. It was moreover found that both crystal growth and unit cell expansion are inhibited, up to the highest temperature investigated (800 °C), proving thus that the Mn addition stabilizes the formed L10 structure further. Magnetic hysteresis loops confirmed structural data, revealing a strong coercive field for a sample wherein single phase, hard, magnetic tetragonal L10 exists. These findings open good perspectives for use as nanocomposite, rare earth free magnets, working in extreme operation conditions.

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.

Stress-induced magnetic hysteresis in amorphous microwires probed by microwave giant magnetoimpedance measurements

2013 ◽  
Vol 113 (17) ◽  
pp. 17A326 ◽  
Author(s):  
V. V. Popov ◽  
V. N. Berzhansky ◽  
H. V. Gomonay ◽  
F. X. Qin
Keyword(s):  
Magnetic Hysteresis ◽  
Giant Magnetoimpedance ◽  
Amorphous Microwires

Magnetic and Microstructural Aspects of the Bulk Metallic Glassy Materials Nd60Fe30Al10

2001 ◽  
Vol 674 ◽  
Author(s):  
N. H. Dan ◽  
N. X. Phuc ◽  
V. H. Ky ◽  
N. M. Hong ◽  
N. Chau ◽  
...  
Keyword(s):  
Room Temperature ◽  
Amorphous Material ◽  
Magnetic Hysteresis ◽  
Degree Of Crystallinity ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
Cast Sample ◽  
X Ray ◽  
Glassy Materials ◽  
Ferromagnetic Bulk

ABSTRACTThe ferromagnetic bulk metallic glass (BMG) Nd60Fe30Al10system exhibits extremely large coercivities at low temperature and moderate coercivities near room temperature. The magnetic hardness, as best evidenced by the onset of magnetic irreversibility, was studied in bulk suction-cast and melt-spun alloys with the nominal composition Nd60Fe30Al10. Systematic x-ray diffraction studies of the degree of crystallinity performed as a function of position within the bulk suction-cast samples is found to correlate with the variation in the room-temperature magnetic hysteresis character. X-ray diffraction data clearly shows the presence of both crystallites and amorphous material on the samples' outmost surfaces; the amorphous phase content increases with distance into the cast sample. These results underscore the importance of solidification conditions and attendant nanophase selection, on the resultant magnetic properties of this class of alloys.

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.

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
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