Magnetic vortex state and multi-domain pattern in electrodeposited hemispherical nanogranular nickel films

Farzad Nasirpouri, Alexander Samardak, Ekaterina Sukovatitsina, Alexey Ognev, Maksim Stebliy, Alexander Davydenko, Ludmila Chebotkevich, Young-geun Kim, Forough Nasirpouri, Seyed Mehdi Janjan

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Abstract

Magnetic states of nickel nanogranular films were studied in two distinct structures of individual and agglomerated granules electrodeposited on n-type Si(1 1 1) surface from a modified Watts bath at a low pH of 2. Magnetic force microscopy and micromagnetic simulations revealed three-dimensional out-of-plane magnetic vortex states in stand-alone hemispherical granules and their arrays, and multi-domain patterns in large agglomerates and integrated films. Once the granules coalesce into small chains or clusters, the coercivity values increased due to the reduction of inter-granular spacing and strengthening of the magnetostatic interaction. Further growth leads to the formation of a continuous granulated film which strongly affected the coercivity and remanence. This was characterized by the domain wall nucleation and propagation leading to a stripe domain pattern. Magnetoresistance measurements as a function of external magnetic field are indicative of anisotropic magnetoresistance (AMR) for the continuous films electrodeposited on Si substrate.

Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume371
DOIs
Publication statusPublished - 2014 Jan 1

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Nasirpouri, F., Samardak, A., Sukovatitsina, E., Ognev, A., Stebliy, M., Davydenko, A., ... Janjan, S. M. (2014). Magnetic vortex state and multi-domain pattern in electrodeposited hemispherical nanogranular nickel films. Journal of Magnetism and Magnetic Materials, 371, 149-156. https://doi.org/10.1016/j.jmmm.2014.07.042