The Influence of Oxidation on the Magnetic, Electrical, and Mechanical Properties of Co40Fe40Yb20 Films

Wen-Jen Liu; Yung-Huang Chang; Chia-Chin Chiang; Yuan-Tsung Chen; Ying-Hsuan Chen; Hui-Jun You; Te-Ho Wu; Shih-Hung Lin; Po-Wei Chi

doi:10.3390/ma15238675

The Influence of Oxidation on the Magnetic, Electrical, and Mechanical Properties of Co₄₀Fe₄₀Yb₂₀ Films

Materials (Basel). 2022 Dec 5;15(23):8675. doi: 10.3390/ma15238675.

Authors

Wen-Jen Liu¹, Yung-Huang Chang², Chia-Chin Chiang³, Yuan-Tsung Chen⁴, Ying-Hsuan Chen⁴, Hui-Jun You⁴, Te-Ho Wu⁴, Shih-Hung Lin⁵, Po-Wei Chi⁶

Affiliations

¹ Department of Materials Science and Engineering, I-Shou University, Kaohsiung 84001, Taiwan.
² Bachelor Program in Interdisciplinary Studies, National Yunlin University of Science and Technology, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan.
³ Department of Mechanical Engineering, National Kaohsiung University of Science and Technology, 415 Chien Kung Road, Kaohsiung 80778, Taiwan.
⁴ Graduate School of Materials Science, National Yunlin University of Science and Technology, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan.
⁵ Department of Electronic Engineering, National Yunlin University of Science and Technology, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan.
⁶ Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan.

Abstract

A typical body-centered cubic (BCC) CoFe(110) peak was discovered at approximately 2θ = 44.7°. At 2θ = 46°, 46.3°, 47.7°, 55.4°, 54.6°, and 56.4°, the Yb₂O₃ and Co₂O₃ oxide peaks were visible in all samples. However, with a heat treatment temperature of 300 °C, there was no typical peak of CoFe(110). Electrical characteristics demonstrated that resistivity and sheet resistance reduced dramatically as film thickness and annealing temperatures increased. At various heat treatments, the maximum hardness was 10 nm. The average hardness decreased as the thickness increased, and the hardness trend decreased slightly as the annealing temperature was higher. The highest low-frequency alternative-current magnetic susceptibility (χ_ac) value was discovered after being annealed at 200 °C with 50 nm, and the optimal resonance frequency (f_res) was discovered to be within the low-frequency range, indicating that the Co₄₀Fe₄₀Yb₂₀ film can be used in low-frequency applications. The maximum saturation magnetization (Ms) was annealed at 200 °C for 50 nm. Thermal disturbance caused the Ms to decrease as the temperature reached to 300 °C. The results show that when the oxidation influence of as-deposited and thinner films is stronger than annealing treatments and thicker thickness, the magnetic and electrical properties can be enhanced by the weakening peak of the oxide, which can also reduce interference.

Keywords: X-ray diffraction (XRD); adhesion; annealed Co40Fe40Yb20 thin films; electrical characteristics; low-frequency alternating current magnetic susceptibility (χac); mechanical property; oxidation effect.

Abstract

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