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- Publisher
- American Physical Society (APS)
- Copyright
- Copyright © 2004 The American Physical Society
- ISSN
- 1550-235X
- DOI
- 10.1103/PhysRevB.70.174436
- Publisher site
- See Article on Publisher Site
Abstract
We find that ensembles of iron nanocrystals embedded within a matrix of Si O 2 exhibit both a large Faraday rotation and ultrafast magnetic relaxation. The Verdet constant is 6.3 ° ± 0.4 ° ∕ cm ∕ Oe and a still-unsaturated Faraday rotation of 3.8 ° ± 0.2 ° ∕ μ m was observed at a wavelength of 532 nm for a specimen containing nanocrystals ranging up to 20 nm in diameter. The dynamic response of the nanocrystals to a transient magnetic field produced by a current pulse propagating through a lithographically patterned wire was probed using time-resolved magneto-optical Kerr-effect microscopy. The rise time of the magnetic response to a transient out-of-plane field was observed to be as fast as 26 ps . Magnetostatic interactions between nanoparticles play a significant role in determining the observed static and dynamic properties of the nanocomposite.
Journal
Physical Review B – American Physical Society (APS)
Published: Nov 1, 2004