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Title: Experimental studies and micromagnetic simulations of electrodeposited Co nanotube arrays

Magnetic hollow nanotubes of cobalt forming close-packed arrays are synthesized by controlling the growth during electrodeposition in AAO template. Superconducting quantum interference device (SQUID) magnetometry is used to experimentally measure the static magnetization of the array of nanotubes. Excellent qualitative agreements of SQUID and micromagnetic simulations for static measurements are observed. This motivates us to evaluate dynamic response measurements via micromagnetic simulations. The coercivity simulated along the longitudinal axis of the nanotube is found increase with the length of isolated as well as for array of nanotubes. The effect of interactions is also clearly observed both in static as well as in dynamic evaluations. The interactions cause reduction in coercivity along with the switching which depends upon the length of the nanotubes. The calculation for FMR modes also indicates that propagation of the spin waves are greatly influenced by the hollow centre of nanotube as compare to nanowire and support to maintain the stable vortex configuration. For array of nanotubes, multiple peaks are found over larger number of frequencies which is anticipated due the interactions between nanotubes. Simulation for bias field and angular dependence of spin wave modes also yields a significant influenced by the presence of neighbouring nanotubes.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea and Centre for Applied Research in Electronics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016 (India)
  2. Institute of Experimental Physics, Saarland University, P.O. Box 151150, D-66041 Saarbruecken (Germany)
  3. Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016 (India)
  4. Atrenta India Pvt. Ltd, Sector 2 Noida, Uttar Pradesh 201301 (India)
Publication Date:
OSTI Identifier:
22314552
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; COBALT; COERCIVE FORCE; COMPARATIVE EVALUATIONS; ELECTRODEPOSITION; FERROMAGNETIC RESONANCE; MAGNETIZATION; NANOTUBES; SIMULATION; SPIN WAVES; SQUID DEVICES