Impacts of amorphous and crystalline cobalt ferrite layers on the giant magneto-impedance response of a soft ferromagnetic amorphous ribbon

Journal Article · Sun Sep 28 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4896583· OSTI ID:22305712

Mukherjee, D.; Devkota, J.; Ruiz, A.; Hordagoda, M.; Hyde, R.; Witanachchi, S.; Mukherjee, P.; Srikanth, H.

A systematic study of the effect of depositing CoFe₂O₄ (CFO) films of various thicknesses (d = 0–600 nm) on the giant magneto-impedance (GMI) response of a soft ferromagnetic amorphous ribbon Co₆₅Fe₄Ni₂Si₁₅B₁₄ has been performed. The CFO films were grown on the amorphous ribbons by the pulsed laser deposition technique. X-ray diffraction and transmission electron microscopy revealed a structural variation of the CFO film from amorphous to polycrystalline as the thickness of the CFO film exceeded a critical value of 300 nm. Atomic force microscopy evidenced the increase in surface roughness of the CFO film as the thickness of the CFO film was increased. These changes in the crystallinity and morphology of the CFO film were found to have a distinct impact on the GMI response of the ribbon. Relative to the bare ribbon, coating of amorphous CFO films significantly enhanced the GMI response of the ribbon, while polycrystalline CFO films decreased it considerably. The maximum GMI response was achieved near the onset of the structural transition of the CFO film. These findings are of practical importance in developing high-sensitivity magnetic sensors.

• OSTI ID: 22305712
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMORPHOUS STATE
ATOMIC FORCE MICROSCOPY
COBALT COMPOUNDS
COBALT OXIDES
CRYSTALS
ENERGY BEAM DEPOSITION
FERRITES
FILMS
IMPEDANCE
LASER RADIATION
LAYERS
MAGNETORESISTANCE
POLYCRYSTALS
PULSED IRRADIATION
ROUGHNESS
SENSITIVITY
SURFACES
THICKNESS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION