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Title: Control of domain wall pinning by localised focused Ga {sup +} ion irradiation on Au capped NiFe nanowires

Understanding domain wall pinning and propagation in nanowires are important for future spintronics and nanoparticle manipulation technologies. Here, the effects of microscopic local modification of the magnetic properties, induced by focused-ion-beam intermixing, in NiFe/Au bilayer nanowires on the pinning behavior of domain walls was investigated. The effects of irradiation dose and the length of the irradiated features were investigated experimentally. The results are considered in the context of detailed quasi-static micromagnetic simulations, where the ion-induced modification was represented as a local reduction of the saturation magnetization. Simulations show that domain wall pinning behavior depends on the magnitude of the magnetization change, the length of the modified region, and the domain wall structure. Comparative analysis indicates that reduced saturation magnetisation is not solely responsible for the experimentally observed pinning behavior.
Authors:
;  [1]
  1. Department of Physics, Durham University, Durham (United Kingdom)
Publication Date:
OSTI Identifier:
22308159
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; GALLIUM IONS; GOLD; ION BEAMS; IRON ALLOYS; IRRADIATION; LAYERS; MAGNETIC FLUX; MAGNETIC PROPERTIES; MAGNETIZATION; NANOWIRES; NICKEL ALLOYS; QUANTUM WIRES; RADIATION DOSES; SATURATION; SIMULATION