Curriculum Vitae of Edgar Bonet Orozco
- Postal address:
- Institut Néel
25 avenue des Martyrs
38042 Grenoble cedex 9
- +33 476 88 10 96
- +33 476 88 11 91
- College École Normale supérieure
- 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
- October 1999:
- PhD in magnetism at Laboratoire
- December 1999 - October 2001:
- Postdoc at Cornell University
- Since November 2001:
- Doing research
at Laboratoire Louis Néel.
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.
- From 1996 to 1998:
- Lectures and practical training in electronics at
Joseph Fourier University.
- W. Wernsdorfer, E. Bonet, K. Hasselbach, A. Benoît, B. Barbara,
N. Demoncy, A. Loiseau, H. Pascard and D. Mailly, Experimental Evidence
of the Néel-Brown Model of Magnetization Reversal, Phys. Rev.
Lett. 78, 1791 (1997).
- W. Wernsdorfer, E. Bonet, K. Hasselbach, A. Benoît, D. Mailly, O. Kubo,
H. Nakano and B. Barbara, Macroscopic Quantum Tunneling of Magnetization
of Single Ferrimagnetic Nanoparticles of Baryum Ferrite, Phys. Rev.
Lett. 79, 4014 (1997).
- W. Wernsdorfer, E. Bonet, B. Barbara, A. Benoît, D. Mailly, N. Demoncy,
H. Pascard, O. Kubo and H. Nakano, Magnetization Reversal of Individual
Nanoparticles -- Macroscopic Quantum Tunneling of Magnetization, IEEE
Transactions on Magnetics 34, 973 (1998).
- E. Bonet, W. Wernsdorfer, B. Barbara, K. Hasselbach, A. Benoît
and D. Mailly, Single Particle Measurement Showing Agreement with the
Model of Uniform Rotation, IEEE Transactions on Magnetics
34, 979 (1998).
- Poster presentation at JMC5, 1996, Orléans;
- Oral presentation at GDR agrégats, 1996, Toulousee;
- Oral presentation Nucleation and magnetization reversal in a nanowire
or a nanoparticle at low temperature at Colloque Louis Néel, june 1997,
Banyuls sur Mer;
- Oral presentation Single Particle Measurement Showing Agreement with
the Model of Uniform Rotation at Joint Conference MMM-Intermag,
january 1998, San Francisco;
- Poster presentation at CMD17-JMC6 conference, august 1998, Grenoble;
- Poster presentation at Nanoscience Seminar, november 1998, Saclay;
- Oral presentation Measuring the effective anisotropy of individual
nanoparticles at GDR POMMES, december 1998, Gif sur Yvette.
- Spanish (mother tongue), French, English.
- Programming in C and other languages.
- Good knowledge in LATEX, Unix, networks...
- Experience in computerizing an experimental setup.