Magnetic,structural and electrical properties of ordered and disordered Co50Fe50 films |
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| Authors: | YT Chen SU Jen YD Yao JM Wu GH Hwang TL Tsai YC Chang AC Sun |
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| Institution: | 1. Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, ROC;2. Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu, Taiwan 30043, ROC;3. Department of Physics, National Kaohsiung Normal University, Kaohsiung 824, Taiwan, ROC;4. Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 107, Taiwan, ROC;5. Center for Nanostorage Research, National Taiwan University, Taipei 106, Taiwan, ROC |
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| Abstract: | Co50Fe50 films with thickness varying from 100 to 500 Å were deposited on a glass substrate by sputtering process, respectively. Two kinds of CoFe films were studied: one was the as-deposited film, and the other the annealed film. The annealing procedure was to keep the films at 400 °C for 5 h in a vacuum of 5×10−6 mbar. From the X-ray study, we find that the as-deposited film prefers the CoFe(1 1 0) orientation. Moreover, the body-centered cubic (bcc) CoFe(1 1 0) line is split into two peaks: one corresponding to the ordered body-centered tetragonal (bct) phase, and the other, the disordered bcc phase. After annealing, the peak intensity of the ordered bct phase becomes much stronger, while that of the disordered bcc phase disappears. The annealing has also caused the ordered CoFe(2 0 0) line to appear. When the amount of the ordered bct phase in Co50Fe50 is increased, the saturation magnetization (Ms) and coercivity (Hc) become larger, but the electrical resistivity (ρ) decreases. From the temperature coefficient of resistance (TCR) measurement, we learn that the bct grains in the CoFe film start to grow at temperature 82 °C. |
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| Keywords: | 73 61 &minus r 75 70 &minus I |
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