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visitors since December 2005

  New publications
Ferromagnetic resonance study of polycrystalline Fe1-xVx alloy thin films, J-M. L. Beaujour et al., accepted for publication in J. Appl. Phys. (2008)

  MMM Meeting 5-9 Nov. 2007 - Tampa
I will give a contributed talk of 10 minutes.
The title: "Ferromagnetic resonance study of polycrystalline Fe1-xVx alloy thin films".                                 
 link
 

  MISC

ENGAUGE DIGITIZER A must have for engineers and scientists, and it's FREE. This freeware enables to extract data from images of graphs and charts. You just import the image, identify a few axis points, and let the program take care of the rest. The points can be exported in a csv file. link

MIMETEX
Amazing cgi script that enables to embed TeX-style mathematical equations in html pages. For more info 
link
 

Toshiba Satellite - How to recover a dying laptop?
If like me, your Toshiba does not stop shutting down because the  CPU overheats, you should try this before sending the laptop to Toshiba. I spend 30 minutes with a gun of compressed air to clean up the back of the computer-remove all the dust on the fans and motherboard. No need to dismount the keyboard or any other parts. Since then, I never experienced a single issue of overheating of the CPU. The cooling system works so fine that I can run GraphEdit + VMWare + WinDVD all in the same time without problem.

NANOTECHNOLOGY AND PHYSICS ...
Today's forefront technological applications of magnetic materials are based on the manipulation of the magnetization on nanosecond time scales and mesoscopic length scales. Examples are magnetization changes in lithographically produced recording heads and memory cells or the writing of magnetic "bits" on recording disks. In all cases the key process involves switching of the mesoscopic magnetic state by an applied magnetic field that is generated by an electromagnet.

The challenge in magnetism today is the development of new methods of magnetization control that overcomes the limits imposed by classical electromagnetism such as the long range and slow spatial decay of regular magnetic fields and their limited rise -and decay- time imposed by the induction laws.

 

New York City
March 2005

FERROMAGNETIC RESONANCE MEASUREMENTS OF ULTRATHIN FILMS

The dynamics of the magnetization in ultrathin films is attracting particular attention from physicists in particular with the development of spintronic devices. FMR is a very useful and efficient technique that provides a lot of information on the magnetic characteristics of a film. The frequency dependence of the resonance field enables to extract the g-factor, the anisotropy fields. The linewidth of the absorption curve allows the estimate of  the Gilbert damping, the investigation on the quality of the films, magnetic inhomogeneities and roughness.
We are carrying out measurements on magnetic layered films grown by electron-beam/thermal evaporation where the thickness ranges from 1nm up to 20nm. Home-made coplanar waveguides are used to generate homogeneous ac magnetic field.......... Read more

POSTDOCTORAL RESEARCH PROJECTS
                      since September 2003 (in progress)
Prof. Kent Research Group, Mesoscopic magnetism

                                             New York University, New York


The Coplanar Waveguide is mounted in a rectangular brass cavity. The system enables to conduct frequency broadband Ferromagnetic Resonance measurements (designed with PovRay).

 

PUBLICATIONS FROM MY CURRENT RESEARCH:
· Ferromagnetic resonance study of polycrystalline Fe1-x Vx alloy thin films
J-M. L. Beaujour, J. Z. Sun, A. D. Kent, accepted for publication in J. Appl. Phys.  (2008)
· Ferromagnetic resonance study of Co|Ni multilayers
J-M. L. Beaujour, W. Chen, K. Krycka, C-C. Kao, J. Z. Sun, A. D. Kent, Eur. Phys. J. B (March 2007)
· Magnetization damping in ultrathin polycrystalline Co films: evidence for non local effects
J-M. L. Beaujour, J. H. Lee, A. D. Kent, K. K. Krycka, C-C. Kao, Phys. Rev. B 74, 214405 (2006)
· Ferromagnetic resonance study of polycrystalline Cobalt ultrathin films
J-M. L. Beaujour, W. Chen, A. D. Kent, J. Z. Sun, J. Appl. Phys. 99, 08N503 (2006)

ACKNOWLEDGEMENTS IN FOLLOWING PUBLICATIONS:
· Spin-Transfer-Driven Ferromagnetic Resonance of Individual Nanomagnets
J. Sankey et al., Phys. Rev. Lett. 96, 227601 (2006)

Copyright ® 2004   www.jmbeaujour.com                          Please, send me an e-mail to report broken links.                             Last update: October 2007