Coercivity and Phase Evolution in Mechanically Milled (FeCo)<sub>2</sub>B-Type Hard Magnetic Alloy

Kim, K. M.; Kwon, Hansang; Lee, J. G.; Yu, Juan

doi:10.1109/tmag.2018.2842063

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…Experimental studies of these alloys include, for example, analyses of the full range of cobalt concentration [11][12][13] along with reinvestigation of their intrinsic magnetic properties [14]. Other experiments involved characterization of (Fe 0.7 Co 0.3 ) 2 B single crystal [15] and mechanically milled (Fe 0.675 Co 0.3 Re 0.025 ) 2 B [16]. Experimental efforts were also supported by numerous first-principles calculations.…”

Section: Introductionmentioning

confidence: 99%

Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study

Musiał¹,

Marciniak²,

Z.³

et al. 2021

Preprint

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Fe,Co) 2 B-based compounds with specified 5d substitutions are considered as promising materials for permanent magnets without rare-earth elements. We conducted a combined first-principles and experimental study focused on (Fe 0.7 Co 0.3 ) 2 B alloys doped with W and Re. First, we used fullpotential local-orbital scheme to systematically investigate (Fe,Co) 2 B alloys with 3d, 4d, and 5d substitutions. Computational analyses showed a significant increase in magnetocrystalline anisotropy only for the Re doped sample. Simultaneously, the structural and magnetic properties of the (Fe 0.7−x Co 0.3−x M 2x ) 2 B (M = W, Re; x = 0, 0.025) alloys were investigated experimentally. The desired (Fe,Co) 2 B tetragonal phase was synthesized by heat treatment of amorphous precursors. We observed that isothermal annealing increases the coercive field of all samples. However, the obtained values, without further optimization, are well below the threshold for permanent magnet applications. Nevertheless, annealing of substituted samples at 750 o C significantly improves saturation magnetization values. Furthermore, Mössbauer spectroscopy revealed a reduction of the hyperfine field due to the presence of Co atoms in the (Fe,Co) 2 B phase, where additional defect positions are formed by Re and W. Radio-frequency Mössbauer studies showed that (Fe 0.7 Co 0.3 ) 2 B and the W-substituted sample began to crystallize when exposed to an radio frequency field of 12 Oe, indicating that the amorphous phase is stabilized by Re substitution. Improvement of thermal stability of (Fe 0.675 Co 0.275 Re 0.05 ) 2 B alloy is consistent with the results of differential scanning calorimetry and thermomagnetic measurements.

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Section: Introductionmentioning

confidence: 99%

Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study

Musiał¹,

Marciniak²,

Z.³

et al. 2021

Preprint

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Necessity and suitability of in-line inspection for corrosion resistant alloy (CRA) clad pipelines

Reda

Shahin

Sultan

et al. 2022

Ships and Offshore Structures

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Fatigue Characteristics of Magnetostrictive Thin-Film Coated Surface Acoustic Wave Devices for Sensing Magnetic Field

et al. 2020

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Magnetostrictive thin-film coated Surface Acoustic Wave (SAW) devices were promising for sensing magnetic field owing to their superior features as micro-size, fast response, and high sensitivity originated from the magnetostrictive effect. However, the magnetostriction nature in magnetostrictive thinfilm causes significantly mechanical fatigue in service, deteriorating the sensor performances. In this work, the fatigue phenomenon in magnetostrictive coating was underlined by characterizing the prepared FeCo thin-film coated magnetic device cyclically. Obvious shedding was observed in FeCo coating after cyclic testing and the magnetic-sensitivity decreases significantly. One of the reasons is the weak adhesion of FeCo thin-film towards the substrate. As an available way allowing enhancement of adhesion, a Cr thinfilm was employed as the transition-layer to weaken the mechanical fatigue. However, it accompanied by the issue of the reduced magnetostrictive coefficient and the obstruction in magnetostrain-tranfer to piezoelectric substrate. As a result, the slump in sensitivity was observed. To address such issues, a design of dotted-pattern with Cr transition layer was employed to build the SAW based magnetic-device. High magnetic-sensitivity and excellent long-term stability were achieved because of the release of coercive force in FeCo dots and enhancement of the FeCo adhesion to the substrate.INDEX TERMS Dotted-pattern, mechanical fatigue, magnetostrictive effect, SAW magnetic sensor, Cr transition layer.

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Coercivity and Phase Evolution in Mechanically Milled (FeCo)₂B-Type Hard Magnetic Alloy

Cited by 3 publications

References 20 publications

Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study

Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study

Necessity and suitability of in-line inspection for corrosion resistant alloy (CRA) clad pipelines

Fatigue Characteristics of Magnetostrictive Thin-Film Coated Surface Acoustic Wave Devices for Sensing Magnetic Field

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Coercivity and Phase Evolution in Mechanically Milled (FeCo)2B-Type Hard Magnetic Alloy

Cited by 3 publications

References 20 publications

Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study

Structural transformation and magnetic properties of (Fe$_{0.7}$Co$_{0.3}$)$_2$B alloys doped with 5$d$ elements: A combined first-principles and experimental study

Necessity and suitability of in-line inspection for corrosion resistant alloy (CRA) clad pipelines

Fatigue Characteristics of Magnetostrictive Thin-Film Coated Surface Acoustic Wave Devices for Sensing Magnetic Field

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Product

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Coercivity and Phase Evolution in Mechanically Milled (FeCo)₂B-Type Hard Magnetic Alloy