Abstract
FePt/Ag films were deposited on thermally oxidized Si(100) substrates by magnetron sputtering at room temperature and then the as-deposited films were annealed at 500 ∘C. The microstructure and magnetic properties of the films have been investigated by X-ray diffraction and vibrating sample magnetometry. The results indicate that introduction of the Ag underlayer promotes an ordering transformation of the FePt phase due to thermal tensile stress between the Ag underlayer and the FePt film. The in-plane tensile stress induced by the Ag underlayer should stretch the horizontal lattice parameter of FePt; thus, it is helpful for the ordering transformation. With increasing Ag underlayer thickness, the ordering parameter and coercivity first increase and then decrease. When the Ag underlayer thickness is 12 nm, the ordering parameter and coercivity of the film reach the maximum values, respectively. The Ag underlayer thickness also affects the magnetization reversal mechanism.
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Acknowledgements
The present work was supported by the National Natural Science Foundation of China (Nos. 20971055 and 11147146) and the Key Project of the Chinese Ministry of Education (No. 208178).
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Zhang, Y., Yu, W., Chen, F. et al. Effect of Ag underlayer thickness on the microstructure and magnetic properties of L10-FePt films. Appl. Phys. A 110, 249–253 (2013). https://doi.org/10.1007/s00339-012-7122-0
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DOI: https://doi.org/10.1007/s00339-012-7122-0