کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5349169 | 1503614 | 2015 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Structure, microstructure and magnetic properties of Ni75Fe25 films elaborated by evaporation from nanostructured powder Structure, microstructure and magnetic properties of Ni75Fe25 films elaborated by evaporation from nanostructured powder](/preview/png/5349169.png)
- Ni75Fe25 permalloy (Py) thin films with different thicknesses were deposited by vacuum evaporation from nanocrystalline powder onto Si(1Â 1Â 1) substrate.
- The texture was found to change with increasing thickness.
- The existence of nanosized grains with a uniform distribution has been observed.
- The existence of a uniaxial magnetic anisotropy with an easy axis parallel to the film plane has been evidenced.
- The coercive field was found to decrease with increasing thickness.
We report on the structural, microstructural and magnetic properties of Ni75Fe25 permalloy (Py) thin films. Py thin films with different thicknesses were deposited by vacuum evaporation from nanocrystalline powder onto Si (11) substrate. The thickness varies from 16Â nm to 250Â nm. From grazing X-ray diffraction patterns (GIXRD), we have shown the presence of a strong ã200ã texture for the lowest thickness (16Â nm). For the 52Â nm and 84Â nm thick samples, a strong ã111ã preferred orientation is developed. However, for higher thicknesses, a polycrystalline structure is present. From the Scanning Electron Microscopy observations (SEM), we have shown that the surface seems to be very dense with many fine grains. The analysis of EDX spectra revealed that the sample composition is close to the starting Ni75Fe25 powder. A more accurate investigation of the morphology was performed with the atomic force microscopy (AFM). We have shown the existence of nanosized grains with a uniform distribution. The mean diameter of the grains increases from 27Â nm to 40Â nm when the thickness increases. From magnetic measurements, we have shown the existence of a uniaxial magnetic anisotropy with an easy axis parallel to the film plane. The coercive field, HC was found to decrease with increasing thickness.
Journal: Applied Surface Science - Volume 350, 30 September 2015, Pages 50-56