Broad UHF ferromagnetic resonance of iron rich-aluminum pulsed laser deposited thin films

The magnetic susceptibility of Fe–Al off-normal pulsed laser deposited thin films was measured at ultra high frequencies, UHF. Different Fe 1− x –Al x films from pure Fe to x = 0.2 Al were prepared. The films were ≈40 nm thick and non-crystalline peaks were detected by the X-ray diffractometry studi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of non-crystalline solids 2008-12, Vol.354 (47), p.5198-5200
Main Authors: Madurga, V., Vergara, J., Favieres, C.
Format: Article
Language:English
Subjects:
Amorphous metals
Colloids and quantum structures
Composition
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances
spin-wave resonance
Films and coatings
Laser deposition
Magnetic properties
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Metallic glasses
Nanocrystals
Nanoparticles
Physics
Resonance methods
Transition metals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The magnetic susceptibility of Fe–Al off-normal pulsed laser deposited thin films was measured at ultra high frequencies, UHF. Different Fe 1− x –Al x films from pure Fe to x = 0.2 Al were prepared. The films were ≈40 nm thick and non-crystalline peaks were detected by the X-ray diffractometry studies. The magnetization of the films remained between 2.0 and 1.8 T for composition less than or equal to 20% Al. A magnetic anisotropy, from H k ≈ 18 Oe for pure Fe to H k ≈ 130 Oe for 20% Al was measured. These samples exhibited a well-defined ferromagnetic resonance at frequencies between ≈2.0 GHz and 3.8 GHz depending on composition. The broad resonance peaks had a width, at half maximum, w h, in the interval from 2.5 GHz to 4.0 GHz depending on Al content. After fitting the magnetic hysteresis loops using a simple distribution of anisotropy values, we used the Landau–Lifshitz–Gilbert equation to fit the UHF magnetic susceptibility. From this last fit we obtained a high damping coefficient value (≈4 times higher than that corresponding to Co or CoFe films), explaining this broad ferromagnetic resonance of these Fe 1− x –Al x films.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2008.07.041