Magnetic properties of field-annealed FeCo thin films

Coı̈sson, M.; Celegato, Federica; Tiberto, P.; Vinai, F.

doi:10.1016/j.jmmm.2008.04.040

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…Their potential applications on miniaturized products, weapons, coatings, communication devices, and for printed circuit boards, among other applications [2][3][4] make this alloy of industrial importance.…”

Section: Introductionmentioning

confidence: 99%

Co100−xFex magnetic thick films prepared by electrodeposition

Aguirre

Farias

Abraham

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Co100−xFex magnetic thick films prepared by electrodeposition

Aguirre

Farias

Abraham

et al. 2015

Journal of Alloys and Compounds

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“…By manipulating the cobalt-to-iron ratio, the magnetic properties of CoFe can be fine-tuned to meet specific requirements. Furthermore, the substitution of cobalt for iron in appropriate quantities can raise the Curie temperature (T c ), thereby extending the high-temperature operational range [9,10]. However, it is important to note that during annealing and conventional processing, the material's tendency to become brittle or to be deformed is notable, and CoFe alloys do not exhibit low coercivity.…”

Section: Introductionmentioning

confidence: 99%

Surface Roughness-Induced Changes in Important Physical Features of CoFeSm Thin Films on Glass Substrates during Annealing

Fern,

Liu,

Chang

et al. 2023

Materials

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Co60Fe20Sm20 thin films were deposited onto glass substrates in a high vacuum setting. The films varied in thickness from 10 to 50 nm and underwent annealing processes at different temperatures: room temperature (RT), 100, 200, and 300 °C. Our analysis encompassed structural, magnetic, electrical, nanomechanical, adhesive, and optical properties in relation to film thickness and annealing temperature. X-ray diffraction (XRD) analysis did not reveal characteristic peaks in Co60Fe20Sm20 thin films due to insufficient growth-driving forces. Electrical measurements indicated reduced resistivity and sheet resistance with increasing film thickness and higher annealing temperatures, owing to hindered current-carrier transport resulting from the amorphous structure. Atomic force microscope (AFM) analysis showed a decrease in surface roughness with increased thickness and annealing temperature. The low-frequency alternating current magnetic susceptibility (χac) values increased with film thickness and annealing temperature. Nanoindentation analysis demonstrated reduced film hardness and Young’s modulus with thicker films. Contact angle measurements suggested a hydrophilic film. Surface energy increased with greater film thickness, particularly in annealed films, indicating a decrease in contact angle contributing to this increase. Transmittance measurements have revealed intensified absorption and reduced transmittance with thicker films. In summary, the surface roughness of CoFeSm films at different annealing temperatures significantly influenced their magnetic, electrical, adhesive, and optical properties. A smoother surface reduced the pinning effect on the domain walls, enhancing the χac value. Additionally, diminished surface roughness led to a lower contact angle and higher surface energy. Additionally, smoother surfaces exhibited higher carrier conductivity, resulting in reduced electrical resistance. The optical transparency decreased due to the smoother surface of Co60Fe20Sm20 films.

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“…Modifying Sm-Co alloys with elements like Copper (Cu), Iron (Fe), Zirconium (Zr), and Boron (B) is a key strategy for enhancing their magnetic performance [3][4][5][6][7]. It is worth underscoring that the Co content is a crucial determinant of the microstructure and magnetic features of the alloy [8]. Furthermore, the incorporation of Fe fosters the formation of soft magnetic phases with a high magnetic moment, leading to improved remanence and saturation magnetization of SmCo 5−x Fe x alloys, along with a reduction in coercivity.…”

Section: Introductionmentioning

confidence: 99%

Studying the Effects of Annealing and Surface Roughness on Both the Magnetic Property and Surface Energy of Co60Fe20Sm20 Thin Films on Si(100) Substrate

Liu,

Chang,

Chiang

et al. 2023

Coatings

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In this study, Co60Fe20Sm20 alloy was employed for sputter deposition onto Si(100) substrate within a high vacuum environment, and subsequent thermal treatment was conducted using a vacuum annealing furnace. Thorough measurements and analyses were carried out to evaluate how various film thicknesses and annealing temperatures affect the material. The investigations encompassed observations of structural and physical properties, magnetic traits, mechanical behavior, and material adhesion. The results from the four-point probe measurements clearly demonstrate a trend of decreasing resistivity and sheet resistance with increasing film thickness and higher annealing temperature. Analysis through atomic force microscopy (AFM) shows that heightened annealing temperature corresponds to decreased surface roughness. Furthermore, when analyzing low-frequency alternating current magnetic susceptibility (χac), it became evident that the maximum magnetic susceptibility value consistently rises with increased film thickness, regardless of the annealing temperature. Through magnetic force microscopy (MFM) observations of magnetic domain images in the films, it became apparent that there was a noticeable reduction in the brightness contrast of the magnetic domains. Furthermore, nanoindentation analysis reveals a clear trend. Elevating the film thickness leads to a reduction in both hardness and Young’s modulus. Contact angles range between 67.7° and 83.3°, consistently under 90°, highlighting the hydrophilic aspect. Analysis of surface energy demonstrates an escalation with increasing film thickness, and notably, annealed films exhibit a substantial surge in surface energy. This signifies a connection between the reduction in contact angle and the observed elevation in surface energy. Raising the annealing temperature causes a decline in surface roughness. To summarize, the surface roughness of CoFeSm films at different annealing temperatures significantly impacts their magnetic, electrical, and adhesive properties. A smoother surface reduces the pinning effect on domain walls, thus enhancing the χac value. Furthermore, diminished surface roughness leads to a decline in the contact angle and a rise in surface energy. Conversely, rougher surfaces exhibit higher carrier conductivity, contributing to a reduction in electrical resistance.

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Magnetic properties of field-annealed FeCo thin films

Cited by 10 publications

References 8 publications

Co100−xFex magnetic thick films prepared by electrodeposition

Co100−xFex magnetic thick films prepared by electrodeposition

Surface Roughness-Induced Changes in Important Physical Features of CoFeSm Thin Films on Glass Substrates during Annealing

Studying the Effects of Annealing and Surface Roughness on Both the Magnetic Property and Surface Energy of Co60Fe20Sm20 Thin Films on Si(100) Substrate

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