3 years ago

Strong uniaxial magnetic anisotropy in Co films on highly ordered grating-like nanopatterned Ge surfaces.

Satyaranjan Bhattacharyya, Ranveer Singh, T Som, Mohit Kumar, Safiul Alam Mollick
We present a systematic investigation on uniaxial magnetic anisotropy in Co thin films induced by high aspect ratio nanopatterned anisotropic substrates. Self-organized long grating-like nanostructures, with extreme regularities, are fabricated on Ge surfaces using Au-ion implantation at room temperature. Subsequently deposition of Co films are carried out on the same at two different angles. Magneto-optical Kerr effect measurements show strong uniaxial magnetic anisotropy in Co films grown on ion-patterned Ge substrates, fabricated under different ion fluences, along and perpendicular to the direction of the patterns (long grating-like nanostructures). Magnetic force microscopy measurements under different externally applied magnetic fields reveal an easy domain wall motion when the field is applied along the grating-like nanostructures. On the other hand, high amplitude grating-like nanostructures hinder the magnetic spin rotation when the field is applied along the hard axis. The present study will be useful for magnetic recording media and ultra-small magnetic field sensors.

Publisher URL: http://doi.org/10.1088/1361-6528/aaaa74

DOI: 10.1088/1361-6528/aaaa74

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