Abstract
When a material is sputter-deposited on a nanoporous substrate a network-like film is formed on top of the walls that separate the nanochannels. We have carried out an extensive study of the magnetic properties of Fe films deposited on 20 nm pore size nanochannel alumina. Films covering the thickness range 5 nm to 100 nm were characterized using ferromagnetic resonance. From the experimental results it was inferred that thinner films are discontinuous (probably due to the surface roughness) and composed of isolated, partially oriented, anisotropic particles. The resonance field and linewidth have been used to estimate the effective anisotropy and hence an average particle aspect ratio of 1.5, which is very similar to what is actually observed by direct imaging. The effective anisotropy increases for thicker films and tends to saturate for films thicker than 75 nm.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3044-3046 |
| Number of pages | 3 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 36 |
| Issue number | 5 I |
| DOIs | |
| State | Published - Sep 2000 |
| Event | 2000 International Magnetics Conference (INTERMAG 2000) - Toronto, Ont, Canada Duration: Apr 9 2000 → Apr 12 2000 |
Keywords
- Ferromagnetic resonance in films
- Magnetic networks
- Nanostructured materials
- Thin magnetic films
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering