Self-organized exchange-spring magnet in epitaxial β-Fe(Ni)Si2/Si system
Applied Surface Science（2021）
Abstract
•Ultra-thin Py (Ni80Fe20) film was deposited onto a vicinal Si(111) substrate at RT.•Epitaxial β-Fe(Ni)Si2 nanoislands formed on the substrate upon > 600 °C anneal.•Fast in-diffusion of Ni left Ni-deficient nanoisland tops and higher Ni concentration at the bottoms.•Coupling between the nanoisland tops and bottoms created ESM effect between two different FM entities.•Experimental observation of the ESM was corroborated by OOMMF simulations.
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Key words
Exchange-spring magnet,Epitaxial nanostructures,Iron and nickel silicide,Scanning tunneling microscopy
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