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Structural and magnetic properties of electrodeposited cobalt nanowires in polycarbonate membrane
Rani, V. Sudha,Anandakumar, S.,Lee, Hojun,Bang, Wonbae,Hong, Kimin,Yoon, S. S.,Jeong, J.-R.,Kim, CheolGi WILEY-VCH Verlag 2009 Physica status solidi. PSS. A, Applications and ma Vol.206 No.4
<P>We analyzed the structural and magnetic properties of an array of electrodeposited cobalt nanowires grown in polycarbonate membrane with pore size 50 nm diameter and thickness ≤6 μm. The current-time profiles were recorded during the deposition, in order to estimate and understand the growth rate and mechanism of the cobalt nanowires respectively. The formation of single and multi-domains in the nanowires was explained by using simple domain model assumptions. The X-ray diffraction patterns show that the cobalt nanowires were grown in a mixture of fcc and hcp phases. The magnetic properties of the deposited nanowires show that the preferential magnetization orientation close to the perpendicular direction of the nanowire axis. The structural properties of the nanowires were observed by Scanning Electron Microscope (SEM). The magnetic properties were analyzed by Vibrating Sample Magnetometer (VSM) at room temperature. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Template Synthesis of Cobalt Nanowires Using PS-b-PMMA Block Copolymer
Anandakumar, S.,Sudha Rani, V.,Parvatheeswara Rao, B.,Seok Soo Yoon,Jeong, J.-R.,Cheol-Gi Kim IEEE 2009 IEEE transactions on magnetics Vol.45 No.10
<P>Cobalt nanowires with 18 plusmn 5 nm diameter were grown in the self-assembled diblock copolymer templates using electrodeposition technique. The diblock copolymer templates with hexagonally ordered nanoporous structure were successfully synthesized by varying the copolymer thickness from 50 nm to 430 nm and post annealing at temperature 180degC for 24 h. The minimum optimized pore sizes of the template were 18 plusmn 5 nm with well order hexagonal nanoporous structure at copolymer thickness from 350 nm to 430 nm. Cobalt nanowires were then successfully deposited using three electrode configuration potentiostatic electrodeposition methods. To remove the cross linked polystyrene of the template and to display the cobalt nanowires, heat treatment was carried out. The morphology of the templates and cobalt nanowires was observed using Scanning Electron Microscope (SEM). The magnetic properties of the cobalt nanowires are analyzed using Vibrating Sample Magnetometer (VSM).</P>
Translocation of magnetic beads using patterned magnetic pathways for biosensing applications
Anandakumar, S.,Sudha Rani, V.,Jeong, J-R.,Kim, CheolGi,Kim, K. W.,Rao, B. Parvatheeswara American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.105 No.7
<P>We have designed, fabricated, and demonstrated a novel system for translocation of magnetic beads at specific sites of the sensor surface on a single chip for biosensor applications. The soft NiFe elliptical (9 x 4 x 0.1 mu m(3)) elements are arranged as magnetic pathways connected to the model sensor surface. The patterned NiFe elements can generate different stray magnetic fields when they are subjected to the external rotating magnetic field. The inhomogeneity in stray magnetic fields can govern the magnetic bead motion on the pathways. We demonstrated the motion of Dynabead (R) M-280 magnetic bead on patterned pathways by controlling the external rotating magnetic field in clockwise and counterclockwise directions. The magnetic beads that were placed on the magnetic elliptical pathways are shown to be transported to the sensor surface, as well as be pulled out away from the surface. This technique enables microtranslocation of the magnetic beads coated with biomolecules to the specific binding sites of the sensor surface and as well as drive off the nonspecific binding biomolecules from the surface in performing number of sequential bead detection experiments for future integrated lab-on-a-chip systems. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3073965]</P>