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 Keun Kim, Forough Nasirpouri, Seyed Mehdi Janjan

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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 Dec

Keywords

  • Electrodeposition
  • Magnetic domains
  • Magnetic particles
  • Magnetization reversal
  • Vortex state

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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