Effects of temperature gradients on magnetic anisotropy of SmCo based films

Wei, Luxi; Zhang, Y.W.; Gong, Yu-Mi; Hong, Yuan; Qiu, Zhaoguo; Zhao, Lizhong; Liu, X.L.; Zhang, X.F.; Chen, Deyang; Zheng, Zhigang; Xia, Weixing; Zeng, Deliang; Dempsey, Nora; Liu, J.P.

doi:10.1016/j.jallcom.2021.162900

Cited by 6 publications

(1 citation statement)

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“…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. As the annealing temperature increases, there is a significant reduction in magnetic anisotropy, complicating the task of meeting the hightemperature requirements for these magnetic devices [11][12][13]. Introducing a third element is one viable approach to improving the thermal stability of CoFe alloys [14].…”

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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