Recent Research on the Magnetoimpedance Effect in Co-Based Amorphous Ribbons

2013 ◽  
Vol 646 ◽  
pp. 222-227
Author(s):  
Lorena Gonzalez-Legarreta ◽  
V.M. Prida ◽  
Blanca Hernando ◽  
Mihail Ipatov ◽  
Valentina Zhukova ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Axial Magnetic Field ◽  
Anisotropy Field ◽  
Transverse Magnetic ◽  
Fabrication Process ◽  
Frequency Range ◽  
Soft Magnetic ◽  
Amorphous Ribbons ◽  
Current Annealing

We report the recent results obtained on the magnetoimpedance (MI) response in several near-zero magnetostriction Co-based amorphous ribbons with different width, and different transverse magnetic anisotropy (developed during the fabrication process or processing after production by the current annealing technique) in the frequency range of 10 MHz – 3.5 GHz. The evolution of the maximum of MI with the axial magnetic field, ascribed to the anisotropy field, as a function of the frequency provides useful information on the soft magnetic character of the ribbons.

Magnetic Properties of Fe-Co Films with Tuneable In-Plane Uniaxial Anisotropy Prepared by Electrodeposition

2010 ◽  
Vol 160-162 ◽  
pp. 951-956
Author(s):  
Xu Yang ◽  
Lu Qian Gong ◽  
Liang Qiao ◽  
Tao Wang ◽  
Fa Shen Li
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Uniaxial Anisotropy ◽  
Anisotropy Field ◽  
Magnetic Films ◽  
Film Plane ◽  
Electrolyte Temperature ◽  
Soft Magnetic ◽  
Conductive Glass ◽  
Fe Content

Fe-Co soft magnetic films with tuneable in-plane uniaxial anisotropy were successfully electrodeposited onto ITO conductive glass. The influence of composition and electrolyte temperature on in-plane magnetic anisotropy field was investigated. Our results show that the in-plane uniaxial anisotropy can be induced by a magnetic field applied in the film plane during electrodeposition. Fe-Co films with various Fe content in the range from 35 at.% to 53 at.% were obtained and the magnetic anisotropy field was very sensitive to the composition. Moreover, the influence of electrolyte temperature on magnetic anisotropy field was investigated and it was found that the in-plane uniaxial anisotropy field can be tuned by varying the electrolyte temperature from 5 to 40 oC.

scholarly journals High Frequency Magnetoimpedance of FeNi/Cu/FeNi Sensitive Elements with Different Geometries

2009 ◽  
Vol 152-153 ◽  
pp. 373-376 ◽  
Author(s):  
Stanislav O. Volchkov ◽  
Andrey V. Svalov ◽  
G.V. Kurlyandskaya
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Finite Elements ◽  
Magnetic Anisotropy ◽  
Constant Magnetic Field ◽  
High Frequency ◽  
Complex Impedance ◽  
Rf Sputtering ◽  
Frequency Range

In this work magnetoimpedance (MI) behaviour was studied experimentally for Fe19Ni81(175 nm)/Cu(350 nm)/Fe19Ni81(175 nm) sensitive elements deposited by rf-sputtering. A constant magnetic field was applied in plane of the sandwiches during deposition perpendicular to the Cu-lead in order to induce a magnetic anisotropy. Sandwiches with different width (w) of FeNi parts were obtained. The complex impedance was measured as a function of the external magnetic field for a frequency range of 1 MHz to 700 MHz for MI elements with different geometries. Some of MI experimental data are comparatively analysed with finite elements numerical calculations data. The obtained results can be useful for optimization of the design of miniaturized MI detectors.

scholarly journals The effect of uniform magnetic field on spatial-temporal evolution of thermocapillary convection with the silicon oil based ferrofluid

2020 ◽  
Vol 24 (6 Part B) ◽  
pp. 4159-4171
Author(s):  
Shuo Yang ◽  
Rui Ma ◽  
Qiaosheng Deng ◽  
Guofeng Wang ◽  
Yu Gao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Transverse Magnetic Field ◽  
Liquid Bridge ◽  
Thermocapillary Convection ◽  
Surface Deformation ◽  
Axial Magnetic Field ◽  
Transverse Magnetic ◽  
Surface Flow ◽  
Silicon Oil

A uniform axial or transverse magnetic field is applied on the silicon oil based ferrofluid of high Prandtl number fluid (Pr ? 111.67), and the effect of magnetic field on the thermocapillary convection is investigated. It is shown that the location of vortex core of thermocapillary convection is mainly near the free surface of liquid bridge due to the inhibition of the axial magnetic field. A velocity stagnation region is formed inside the liquid bridge under the axial magnetic field (B = 0.3-0.5 T). The disturbance of bulk reflux and surface flow is suppressed by the increasing axial magnetic field. There is a dynamic response of free surface deformation to the axial magnetic field, and then the contact angle variation of the free surface at the hot corner is as following, ?hot, B = 0.5 T = 83.34? > ?hot, B = 0.3 T = 72.16? > > ?hot,B = 0.1 T = 54.21? > ?hot, B = 0 T = 43.33?. The results show that temperature distribution near the free surface is less and less affected by thermocapillary convection with the increasing magnetic field, and it presents a characteristic of heat-conduction. In addition, the transverse magnetic field does not realize the fundamental inhibition for thermocapillary convection, but it transfers the influence of thermocapillary convection to the free surface.

Effect of Current Annealing on Domain Wall Dynamics in Bistable FeCoMoB Microwires

2015 ◽  
Vol 233-234 ◽  
pp. 281-284 ◽  
Author(s):  
Peter Klein ◽  
Rastislav Varga ◽  
Vladimir Komanicky ◽  
Giovanni Badini-Confalonieri ◽  
Manuel Vázquez
Keyword(s):  
Magnetic Field ◽  
Domain Wall ◽  
Magnetic Anisotropy ◽  
Temperature Stability ◽  
Electrical Current ◽  
Domain Wall Dynamics ◽  
Higher Temperature ◽  
Current Annealing

We have studied effect of current annealing on domain wall dynamics of FeCoMoB microwires. It was showed that 10 minutes of current annealing corresponds to 1 hour of classical annealing in furnace. Moreover, electrical current flowing through microwire produces Oersted magnetic field and therefore circular magnetic anisotropy is induced during annealing. As a result, induced circular magnetic anisotropy prefers vortex domain wall with velocities up to 3 km/s that can be observed in the current annealed nanocrystalline FeCoMoB microwires with much higher temperature stability.

Induced magnetic anisotropy in amorphous ribbons by applying a magnetic field during the quenching process

2003 ◽  
Vol 82 (6) ◽  
pp. 937-939 ◽  
Author(s):  
M. Tejedor ◽  
J. A. Garcı́a ◽  
J. Carrizo ◽  
L. Elbaile ◽  
J. D. Santos
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Amorphous Ribbons ◽  
Induced Magnetic Anisotropy ◽  
Quenching Process

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.

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