Large variation of magnetic properties of amorphous Fe-Zr thin films with Ar pressure during sputtering
- Authors
- Kim, Miri; Sung, Nark-Eon; Lim, Sang Ho
- Issue Date
- 31-1월-2017
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- Scientific Reports, v.7
- Indexed
- SCIE
SCOPUS
- Journal Title
- Scientific Reports
- Volume
- 7
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84862
- DOI
- 10.1038/srep41894
- ISSN
- 2045-2322
- Abstract
- A large change is observed in the magnetic properties of amorphous Fe-Zr thin films sputtered at different Ar pressures. The change depends on the composition of the alloys and at compositions near 60 at.% Fe, for example, the magnetisation measured at 10 kOe increases 30-fold with an increase in the Ar pressure from 2 to 10 mTorr. The magnetic properties are well explained by a combination of two phenomena-superparamagnetism and spin glass behaviours-and the large change is partly related to the number density of a magnetically correlated region. Examinations of the microstructure by X-ray diffraction, transmission electron microscopy, and X-ray absorption fine structure spectroscopy reveal no appreciable difference in it as a function of the Ar pressure. This indicates that even a very slight change in the microstructure can greatly affect the magnetic properties of amorphous Fe-Zr thin films, thereby opening up the possibility of employing the magnetic properties of amorphous alloys for the characterisation of amorphous microstructures.
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