| 1 | Deposition and Magnetic Properties of Fe_3O_4/Fe/Fe_3O_4 Tri-layer Films显示文摘The Fe3O4/Fe/Fe3O4 (MIM) tri-layer films (200 nm/12-93 nm/200 um) were prepared on Si(100) by DC-magnetron reactive-sputtering followed by air- or vacuum-annealing at 280-400℃ for 1.5 h, respectively. Magnetic properties and phases under different sandwich and annealing conditions were studied. In MIM structure, the incorporation of the interlayer iron does increase the magnetization measured under 8 kOe (M8K), but reduce coercivity (Hc). The Hc of asdeposited films decreases from 354 Oe to 74 Oe; while M8K increases from 254 to 392 emu/cc. By annealing in air, the whole MIM tri-layer film becomes γ-Fe2O3, Hc is about 550 Oe and M8K is around 250 emu/cc. The coercivity mechanism of as-deposited and annealed MIM trilayer films belongs to domain-wall pinning type. δM plots show that when the interlayer Fe thickness is 12 um, the Fe and Fe3O4 layers are decoupled in the as-deposited and annealed states; while it is coupled in the as deposited state when the Fe thickness increases to 23 um. Vacuum annealing of the MIM films leads to increase in both coercivity and magnetization, and to enhance the exchange coupling between layers. | T.S.Chin and W.C.Yang (Department of Materials Science and Engineering, Tsing Hua University 101, Section 2, Kuang-Fu Rd., Hsinchu, 30043, Taiwan-China) | 2000 | Journal of Materials Science & Technology2000，16，2： | 2 |
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