Structural and magnetic properties of nanostructured Fe50(Co50)–6.5wt% Si powder prepared by high energy ball milling

Khajepour, M.; Sharafi, S.

doi:10.1016/j.jallcom.2011.04.095

Cited by 33 publications

(10 citation statements)

References 28 publications

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“…When the thickness increased from 10 nm to 40 nm, χac decreased sharply with the increase in frequency. According to Equation (2)[29,[32][33][34][35], Hc = PcD 6 K1 4 /μ0MsA 3 ,…”

mentioning

confidence: 99%

Structure, Magnetic Property, Surface Morphology, and Surface Energy of Co40Fe40V10B10 Films on Si(100) Substrate

Liu

Chang

et al. 2020

Applied Sciences

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When B and V are added to CoFe material, the mechanical strength and spin tunneling polarization of a CoFe alloy can be improved and enhanced by the high tunneling magnetoresistance (TMR) ratio. Based on these reasons, it is worthwhile investigating Co40Fe40V10B10 films. In this work, X-ray diffraction (XRD) showed that Co40Fe40V10B10 thin films have some distinct phases including CoFe (110), CoFe (200), FeB (130), and V (110) diffracted peaks with the strongest diffracted peak for 30 nm. The lowest low-frequency alternate-current magnetic susceptibility (χac) was detected at 30 nm because the large grain distribution inducing that high coercivity (Hc) enhances the spin coupling strength and low χac. The external field (Hext) had difficulty rotating in the spin state, hence, the spin sensitivity was reduced and the χac value decreased due to increased surface roughness. The 20 mm thickness had the highest χac 1.96 × 10−2 value at 50 Hz of an optimal resonance frequency (fres). The surface energy increased from 34.2 mJ/mm2 to 51.5 mJ/mm2 for Co40Fe40V10B10 films. High surface energy had corresponding strong adhesive performance. According to the magnetic and surface energy results, the optimal thickness is 20 nm due as it had the highest χac and strong adhesion.

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“…When the thickness increased from 10 nm to 40 nm, χac decreased sharply with the increase in frequency. According to Equation (2)[29,[32][33][34][35], Hc = PcD 6 K1 4 /μ0MsA 3 ,…”

mentioning

confidence: 99%

Structure, Magnetic Property, Surface Morphology, and Surface Energy of Co40Fe40V10B10 Films on Si(100) Substrate

Liu

Chang

et al. 2020

Applied Sciences

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“…The 42 nm of Co 40 Fe 40 W 20 thin film has a smaller B and can induce larger grains to be deposited. Furthermore, the large grain size distribution has higher H c [34,35].…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

Magnetic Properties, Adhesion, and Nanomechanical Property of Co₄₀Fe₄₀W₂₀ Films on Si (100) Substrate

Liu

Chang

et al. 2020

Journal of Nanomaterials

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In this study, a Co40Fe40W20 alloy was sputtered onto Si (100) with thicknesses (tf) ranging from 18 to 90 nm, and the corresponding structure, magnetic properties, adhesive characteristics, and nanomechanical properties were investigated. X-ray diffraction (XRD) patterns of the Co40Fe40W20 films demonstrated a significant crystalline body-centered cubic (BCC) CoFe (110) structure when the thickness was 42 nm, and an amorphous status was shown when the thickness was 18 nm, 30 nm, 60 nm, and 90 nm. The saturation magnetization (Ms) showed a saturated trend as tf was increased. Moreover, the coercivity (Hc) showed a minimum 1.65 Oe with 30 nm. Hc was smaller than 4.5 Oe owing to the small grain size distribution and amorphous structure, indicating that the Co40Fe40W20 film had soft magnetism. The low-frequency alternating current magnetic susceptibility (χac) decreased as the frequency was increased. The χac revealed a thickness effect when greater thicknesses had a large χac. The maximum χac and optimal resonance frequency (fres) of Co40Fe40W20 were investigated. The maximum χac indicated the spin sensitivity and was maximized at the optimal resonance frequency. The 90 mm thickness had the highest χac 0.18 value at an fres of 50 Hz. The contact angles of the Co40Fe40W20 films are less than 90°, which indicated that the film had a good wetting effect and hydrophilicity. The surface energy was correlated with the adhesion and displayed a concave-down trend. CoFeW films can be used as a seed or buffer layer; therefore, the surface energy and adhesion are very important. The highest surface energy was 30.12 mJ/mm2 at 42 nm and demonstrated high adhesion. High surface energy has corresponding strong adhesive performance. The increased surface roughness can induce domain wall pinning effect and high surface energy, causing a high coercivity and strong adhesion. The increase of hardness and Young’s modulus could be reasonably inferred from the thinner CoFeW films. The hardness and Young’s modulus of CoFeW films are also displayed to saturated tendency when increasing thickness.

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“…It is well-known that H C is one of the structural sensitive properties of magnetic materials and depends strongly on the internal defects such as reduction in grain size, grain boundaries, dislocations and inclusion of additional materials. The increase in H C can be correlated to the induced magnetic anisotropy and change in the grain boundaries, which acts as inclusions and hinder the domain wall motion [34]. Moreover, it is well known that H C of the mechanically alloyed powders in the as-milled condition is relatively large due to the strain induced during the milling process.…”

Section: Evolution Of Magnetic Propertiesmentioning

confidence: 99%

Structural and magnetic properties of nanocrystalline Fe–Co–Si alloy powders produced by mechanical alloying

Shyni

Perumal

2015

Journal of Alloys and Compounds

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Structural and magnetic properties of nanostructured Fe50(Co50)–6.5wt% Si powder prepared by high energy ball milling

Cited by 33 publications

References 28 publications

Structure, Magnetic Property, Surface Morphology, and Surface Energy of Co40Fe40V10B10 Films on Si(100) Substrate

Structure, Magnetic Property, Surface Morphology, and Surface Energy of Co40Fe40V10B10 Films on Si(100) Substrate

Magnetic Properties, Adhesion, and Nanomechanical Property of Co₄₀Fe₄₀W₂₀ Films on Si (100) Substrate

Structural and magnetic properties of nanocrystalline Fe–Co–Si alloy powders produced by mechanical alloying

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Structural and magnetic properties of nanostructured Fe50(Co50)–6.5wt% Si powder prepared by high energy ball milling

Cited by 33 publications

References 28 publications

Structure, Magnetic Property, Surface Morphology, and Surface Energy of Co40Fe40V10B10 Films on Si(100) Substrate

Structure, Magnetic Property, Surface Morphology, and Surface Energy of Co40Fe40V10B10 Films on Si(100) Substrate

Magnetic Properties, Adhesion, and Nanomechanical Property of Co40Fe40W20 Films on Si (100) Substrate

Structural and magnetic properties of nanocrystalline Fe–Co–Si alloy powders produced by mechanical alloying

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Magnetic Properties, Adhesion, and Nanomechanical Property of Co₄₀Fe₄₀W₂₀ Films on Si (100) Substrate