Journal
COATINGS
Volume 12, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/coatings12050627
Keywords
coatings; thin films; growth; sputtering; magnetic multilayers; magnetic anisotropy; exchange bias; NiFeO
Categories
Funding
- Hellenic Foundation for Research and Innovation (HFRI) [1006]
- bilateral German-Greek Collaboration scheme for the promotion of the exchange and scientific corporation, PPP-DAAD IKYDA [57547336]
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The study demonstrates that the fabrication method and doping elements of Ni0.95Fe0.05/NiFeO multilayers have important influences on their layering quality and magnetic properties. Mild thermal annealing enhances the perpendicular magnetic anisotropy of the multilayers, leading to a considerable improvement in magnetic performance.
Ni0.95Fe0.05/NiFeO multilayers were fabricated by radio frequency magnetron sputtering and natural oxidation. Doping of Ni by only 5 at. % Fe results in enhanced layering quality as X-ray reflectivity reveals. Due to magnetostatic anisotropy, the multilayers were found to be in-plane magnetized. The influence of mild thermal annealing (T = 525 K) on the magnetic properties of NiFe/NiFeO multilayers is also investigated. Annealing results in the enhancement of perpendicular magnetic anisotropy, mainly due to an increase in the uniaxial volume anisotropy term. Temperature-dependent hysteresis measurements between 4-400 K revealed considerable enhancement of coercivity and appearance of exchange bias effect.
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