Curriculum Vitae of Edgar Bonet Orozco

Contact information

Postal address:
Institut Néel
25 avenue des Martyrs
bâtiment D
BP 166
38042 Grenoble cedex 9
+33 476 88 10 96
+33 476 88 11 91


College École Normale supérieure de Lyon.
July 1993:
Licenciate in computer science.
July 1994:
Teaching diploma for high school (agrégation) in physics.
September 1996:
Master in statistical physics and non linear phenomena.
September 1997:
Summer school on magnetism of nanoscopic systems in Oradea, Rumania.
October 1999:
PhD in magnetism at Laboratoire Louis Néel.
December 1999 - October 2001:
Postdoc at Cornell University
Since November 2001:
Doing research at Laboratoire Louis Néel.

Summary of PhD work

The new technique of micro-SQUID allows us to measure the magnetization of very small particles, typically 10 to 20 nm in diameter. In my work I have used this technique to measure the magnetic properties of several samples. I spent a great time developing the new generation of our magnetometer. This new magnetometer is highly automated and gives us a great control on the experimental protocol. It was specially important to be able to sweep the applied field following an arbitrary path in the field space and to have a high precision for the switching field measurements. Currently, these measurements are performed with a time resolution of 25  ns.

I first used this new setup to measure magnetic astroids. These astroids are the locus in the field space of all the fields where a magnetization reversal can take place. Being directly related to the effective magnetic anisotropy, they are a good mean of knowing the anisotropy of individual nanoparticles. After measuring the first whole magnetic astroid in two dimensions, I found a way to perform measures in all directions of space. This allowed us to measure whole tri-dimensional astroids, which is important in order to find the magnetic anisotropy constants from the measured astroids.

I had many discussions with André Thiaville on the properties of magnetics astroids. We found algorithms to compute the theoretical astroids from the magnetic anisotropy and he could make a fit of one of our measures. I also performed some measures of the dynamics of the magnetization reversal in order to get experimental values of the Arrhenius prefactor tau0. I plan in the near future to compare these measures with the predicted dependence of tau0 deduced from the effective magnetic anisotropy.

Academic experience

From 1996 to 1998:
Lectures and practical training in electronics at Joseph Fourier University.



Language and computer skills