Transmission electron microscopy study on Co/Fe interdiffusion in SmCo5/Fe and Sm2Co7/Fe/Sm2Co7 thin films
نویسندگان
چکیده
We demonstrate a sharp composition transition at the interface of an as-deposited SmCo5/Fe bilayer, while annealing results in measurable Co/Fe interdiffusion near the boundary. For the annealed SmCo5/Fe bilayer, phase separation occurs within the bcc-layer, forming regions with 3 different Fe:Co ratios. Depositing Fe between Sm-Co layers provides a realistic model for bulk systems. Co/ Fe interdiffusion was observed by TEM in an annealed Sm2Co7/Fe/Sm2Co7 “sandwich” thin film, confirming Co/Fe interdiffusion as the main mechanism controlling phase chemistry in Sm-Co/Fe bulk nanocomposites. The degree of Co/Fe interdiffusion is primarily chemically driven, and the approximate 20% Fe substitution for Co is thermodynamically stable. VC 2011 American Institute of Physics. [doi:10.1063/1.3634063]
منابع مشابه
Effect of Cobalt Concentration on Structural and Magnetic Properties of Co-Fe Thin Films
Co-Fe films were electrodeposited on Cu substrate from electrolytes with different Co concentration levels. X-ray diffraction (XRD) was used to investigate the films crystal structures. The results indicate that if the Co concentration is less that the Fe concentration, the cubic structure appears in the films, while the hexagonal structure dominates when the C...
متن کاملAtom probe study on the bulk nanocomposite SmCo/Fe permanent magnet produced by ball-milling and warm compaction
The microstructure and compositions of the bulk nanocomposite SmCo/Fe permanent magnet were studied using transmission electron microscopy and 3-dimensional atom probe techniques. The excellent magnetic properties were related to the uniform nanocomposite structure with nanometer a-Fe particles uniformly distributed in the SmCo phase matrix. The a-Fe phase contained 26 at% Co, and the SmCo phas...
متن کاملPreparation and characterization of nanostructured S and Fe co-doped TiO2 thin film by ultrasonic-assisted spray pyrolysis method
Nanostructured TiO2 and S and Fe co-doped TiO2 thin films with high transparency were prepared on glass substrate through ultrasonic-assisted spray pyrolysis technique. The effects of doping on morphological, optical an...
متن کاملInterfacial reaction of Co–Fe films with SiO2 substrates
The interdiffusion reaction between Co1 xFex deposited films of various compositions (x = 0.27, 0.32 and 0.50) and an amorphous SiO2 substrate during annealing in vacuum at 800 C was identified by analytical transmission electron microscopy. The reaction results in the formation of Fe2SiO4 mixed silicate of olivine structure as an interfacial phase. The following microstructural changes occurri...
متن کاملInfluence of Co and Fe substitution on optical and structural properties of zinc oxide thin films
Zn0.97TM0.03O (TM = Co, Fe) thin films were deposited onto glass substrates by the sol–gel method and the effects of transition metals substitution on structural and optical properties of ZnO films were investigated. The X-ray diffraction patterns revealed that the films have wurtzite structure. Optical transmittance of the films was recorded in the range of 200 -800 nm wave length and the band...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011