Nickel nanowire arrays are fabricated by electrochemical deposition in highly ordered nanosized pores in AAO (anodized aluminum oxide) templates, and their static and high-frequency noise absorbing properties have been investigated. Using the channelled AAO templates, a nickel nanowires array was fabricated by DC electrodeposition. Magnetic hysteresis was observed with a coercivity of 250- 300 Oe depending on the field orientation with respect to wire axis. Noise absorbing properties of the nickel nanowires array was measured using the microstrip line. S 11 parameter increases with frequency and reaches a saturated value of about -10 dB. The reflected power (about 10%) is much less than that of nickel thin film (about -3 dB), which is due to higher in-plane electrical resistance of the nanowire array structure. S 21 decreases with frequency and has a value of-3 dB at 2 GHz. The attenuation of conduction noise through microstrip line is due to the magnetic loss of individual nickel nanowires. Power absorption of the Ni nanowire array was estimated to be 50% in the frequency range above 2 GHz.
|Number of pages||4|
|Journal||Physica Status Solidi (A) Applications and Materials Science|
|Publication status||Published - 2007 Dec 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Surfaces, Coatings and Films