| Autor: |
Seyed-Mehdi Janjan, Young Keun Kim, Forough Nasirpouri, E. V. Sukovatitsina, Ludmila A. Chebotkevich, Alexey V. Ognev, Maksim E. Stebliy, Farzad Nasirpouri, Alexander S. Samardak, A. V. Davydenko |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Journal of Magnetism and Magnetic Materials. 371:149-156 |
| ISSN: |
0304-8853 |
| DOI: |
10.1016/j.jmmm.2014.07.042 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect