Giant Stress Impedance Magnetoelastic Sensors Employing Soft Magnetic Amorphous Ribbons

Soft magnetic amorphous alloys obtained via rapid quenching techniques are widely employed in different technological fields such as magnetic field detection, bio labeling, non-contact positioning, etc. Among them, magnetoelastic applications stand out due to excellent mechanical properties exhibited by these alloys, resulting from their amorphous structure, namely, their high Young modulus and high tensile strength. In particular, the giant stress impedance (GSI) effect represents a powerful tool to develop highly sensitive magnetoelastic sensors. This effect is based on the changes in the high-frequency electric impedance as the result of the variation in magnetic permeability of the sample under the action of mechanical stresses. In this work, the GSI effect is analyzed in two soft magnetic ribbons ((Co0.93 Fe0.07)75 Si12.5 B12.5 and (Co0.95 Fe0.05)75 Si12.5 B12.5) for the subsequent development of two practical devices: (i) the characterization of the variations in the cross-section dimensions of irregularly shaped elements, and (ii) the design of a flow meter for measuring the rate of flow of water through a pipe.

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Effect of Substituting Hf for Zr on Fe-Co-M-Nb-B (M = Zr, Hf) Amorphous Alloys with High Saturation Magnetization

Metals ◽

10.3390/met12010012 ◽

2021 ◽

Vol 12 (1) ◽

pp. 12

Author(s):

Hyunsol Son ◽

Garam Yoo ◽

Qoimatul Mustaghfiroh ◽

Dong-Hyun Kim ◽

Haein Choi-Yim

Keyword(s):

Saturation Magnetization ◽

Amorphous Alloys ◽

Amorphous Structure ◽

Optimum Ratio ◽

Soft Magnetic ◽

Amorphous Ribbons ◽

Magnetic Performance ◽

Crystallization Onset ◽

Soft Magnetic Amorphous Alloys ◽

Thermal Stability Of

The soft magnetic amorphous ribbons of (FexCo1−x)85M9Nb1B5 (M = Zr or Hf, x = 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9) were investigated in this study. Replacing Zr by Hf turned out to increase saturation magnetization and, at the same time, reduce the coercivity, both of which serve together in enhancing the soft magnetic performance of the alloys. Moreover, the optimum ratio of Fe/Co was determined after the survey on different alloys with varying Fe/Co ratio resulting in the maximum saturation magnetization while keeping the coercivity low. After optimization, the highest saturation magnetization of 1.62 T was achieved with coercity of 11 A/m. While substitution of Hf for Zr slightly reduced the crystallization onset temperature of the amorphous structure, the thermal stability of the soft magnetic amorphous alloys was not significantly affected by the Zr/Hf replacement.

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Investigation on the crystallization mechanism difference between FINEMET® and NANOMET® type Fe-based soft magnetic amorphous alloys

Journal of Applied Physics ◽

10.1063/1.4964433 ◽

2016 ◽

Vol 120 (14) ◽

pp. 145102 ◽

Cited By ~ 12

Author(s):

Yaocen Wang ◽

Yan Zhang ◽

Akira Takeuchi ◽

Akihiro Makino ◽

Yoshiyuki Kawazoe

Keyword(s):

Amorphous Alloys ◽

Crystallization Mechanism ◽

Soft Magnetic ◽

Soft Magnetic Amorphous Alloys

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Formation, and mechanical and magnetic properties of bulk ferromagnetic Fe-Nb-B-Y-(Zr, Co) alloys

Journal of Materials Research ◽

10.1557/jmr.2006.0126 ◽

2006 ◽

Vol 21 (4) ◽

pp. 1019-1024 ◽

Cited By ~ 18

Author(s):

J.M. Park ◽

J.S. Park ◽

D.H. Kim ◽

J-H. Kim ◽

E. Fleury

Keyword(s):

Magnetic Properties ◽

Saturation Magnetization ◽

Amorphous Alloys ◽

Amorphous Structure ◽

Glass Forming Ability ◽

Partial Replacement ◽

Soft Magnetic ◽

Glass Forming ◽

Mold Casting ◽

Co Alloys

Fe element was partially substituted by Zr and Co in an attempt to enhance the glass-forming ability, and mechanical and soft magnetic properties of Fe74-xNb6B17Y3(Zr, Co)x (x = 3, 5, 8) amorphous alloys. Both partial replacements resulted in the enhancement of the glass-forming ability, and 3-mm diameter rods with a fully amorphous structure were prepared by a copper mold casting method. Zr and Co containing Fe-based bulk amorphous alloys exhibited high compressive fracture strength of about 4 and 3.5 GPa, respectively. However, Zr and Co induced different effects on the magnetic properties. Whereas the partial replacement of Fe by Zr was found to decrease dramatically the saturation magnetization, the partial replacement of Fe by Co provided an increase of about 25% of the saturation magnetization.

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