Biomedical Engineering Reference
In-Depth Information
2.10
(a-f) Proposed formation process of the micro-pine dendrite
structure by fast growth along the six crystallographically equivalent
directions.
Fe-Ni due to their excellent soft magnetic properties. Their saturation
magnetization and magnetostriction is high compared with Co-based
amorphous alloys, making them interesting candidates for magnetic
shielding devices due to their higher permeability. The microstructure and
surface morphology of Fe-Ni films are modified using ion beam irradiation
and thermal annealing. The evolution of the surface with parameters such as
ion fluence, vapor deposition time, annealing temperature and substrate
surface roughness has been studied using atomic force microscopy (AFM).
It has been found that the film's surface roughness and microstructure
have a significant influence on magnetic properties such as coercivity,
remanence, saturating field, demagnetizing field and spin reorientation
transition. Films have been structurally characterized using glancing angle
x-ray diffraction (GAXRD), transmission electron microscopy (TEM) and
scanning electron microscopy (SEM). The surface morphology of the films
was probed using atomic force microscopy (AFM) and scanning tunneling
microscopy (STM). Imaging of the magnetic domains has been carried out
using magnetic force microscopy (MFM). Compositions of the films were
determined using energy dispersive x-ray spectroscopy (EDS) and x-ray
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