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The engineering of surface morphology and structure of the thin film is oneof the essential technological assets for regulating the physical propertiesand functionalities of thin film-based devices. This study investigates theevolution of surface structure and magnetic anisotropy in epitaxially grownultrathin Fe films on MgO (001) substrates subjected to multiple cycles of ionbeam erosion (IBE) after growth. Ultrathin Fe film grows in 3D island mode andexhibits intrinsic fourfold magnetic anisotropy. After a few cycles of IBE, thefilm displays an induced uniaxial magnetic anisotropy that leads to a split inthe hysteresis loop. In addition, clear and conclusive evidence of IBE mediated(2x2) reconstruction of the Fe surface has been observed. We also demonstratethat thermal annealing can reversibly tune the induced UMA and surfacereconstruction. The feasibility of the IBE technique by properly selecting ionbeam parameters for modification of surface structure has been highlightedapart from conventional methods of tailoring the morphology for tuning of UMA.Thus, the present work paves a way to explore the IBE-induced self-assemblingphenomena further.

Engineering magnetic anisotropy and the surface of epitaxial Fe films using ion beam erosion; unveiling self-assembly and tunability