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Olivier KLEIN
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Olivier KLEIN 0169087540/7264 0169088786 olivier.klein cea.fr |
Functions:
CEA lead scientist in fundamental research on Condensed Matter - Senior lecturer at École Polytechnique.
Research Interests:
Project leader on the development of Magnetic Resonance Force Microscopy (MRFM) at the CEA in France. MRFMs are inspired by magnetic force microscope. A micron-size permanent magnet is affixed at the free end of a clamped cantilever and placed in the stray field of the sample. The resulting point load on the tip induces an elastic deformation of the cantilever. Changes in the deformation are monitored when the magnetic resonance is electromagnetically excited in the sample. Dimensional analysis shows that cantilevers are better detectors compared to coils when it comes to volume size below the micron scale. Ultra-soft cantilevers have achieved the sensitivity to detect single spin albeit in stringent conditions: vacuum, large field and sub-Kelvin temperatures.
Present-2004: Spin transfer effects and magnetic vortices.
2004-2000: Non-linear dynamics in ferromagnets. Spin relaxation mechanisms. Spin-wave confinement in sub-micron size structures.
2000-1996: Magnetic Resonance Imaging. Bubble and maze magnetic structures. Domain wall resistance.
1995-1993: Transport properties of single electron transistors. Magnetic properties of quantum dots created by the lateral confinement of two-dimensional electron gas in GaAs heterostructures. Evolution of their macrospin with magnetic field using the resonant tunneling potential as a probe.
1990-1993: Characterization of the microwave properties of superconductors and coherence effects: a characteristic peak that appears in the temperature dependence of the optical conductivity, which is a signature of the pairing symmetry in the condensate.
CV:
Olivier Klein is a lead scientist at the Service de Physique de l'État Condensé (CEA-Saclay in France). His areas of expertise are nanomagnetism, magnetic resonance, and near field probe techniques.
Born in 1965, Olivier Klein has joined the CEA in 1996 after a Ph.D. from UCLA dealing with the microwave properties of superconductors, followed by a PostDoctoral fellowship at MIT working on single electron transistors. Since, he obtained his Habilitation thesis from the University of Paris VI in 2004.
His current research interests are the microwave properties of ferromagnets for the field of nanomagnetism and spintronics. Olivier Klein has been the principal investigator in France of the Magnetic Resonance Force Microscopy technique. He is author or co-author of more than 50 papers in international journals and he has one patent. He supervised many PhD students, and since 2008, coordinated the European project MASTER.
Chronology:
- 1999-now: Senior researcher at the Service de Physique de l'Etat Condensé (CEA - Orme des merisiers).
- 1996-1999: Junior researcher at the Laboratoire des Solides Irradiés (Ecole Polytechnique).
- 1993-1995: Postdoctoral fellow in the Physics Department of the Massachusetts Institute of Technology.
- 1988-1993: Ph.D. in Physics at the University of California at Los Angeles.
- 1985-1988: Graduated from École Supérieure de Physique et Chimie de Paris.
Publications:
"Bistability of Vortex Core Dynamics in a Single Perpendicularly Magnetized Nanodisk"
G. de Loubens, A. Riegler, B. Pigeau, F. Lochner, F. Boust, K.Y. Guslienko, H. Hurdequint, L.W. Molenkamp, G. Schmidt, A. N. Slavin, V. S. Tiberkevich, N. Vukadinovic, and O. Klein Phys. Rev. Lett. 102, 177602 (2009)
"Ferromagnetic resonance force spectroscopy of individual submicron-size samples"
O. Klein, G. de Loubens, V. V. Naletov, F. Boust, T. Guillet, H. Hurdequint, A. Leksikov, A. N. Slavin, V. S. Tiberkevich, and N. Vukadinovic, Phys. Rev. B 78, 144410 (2008)
"Magnetic Resonance Studies of the Fundamental Spin-Wave Modes in Individual Submicron Cu/NiFe/Cu Perpendicularly Magnetized Disks"
G. de Loubens, V. V. Naletov, O. Klein, J. Ben Youssef, F. Boust, and N. Vukadinovic, Phys. Rev. Lett. 98, 127601 (2007)
"Ferromagnetic resonance spectroscopy of parametric magnons excited by a four-wave process"
V. V. Naletov, G. de Loubens, V. Charbois, O. Klein, V. S. Tiberkevich, and A. N. Slavin, Phys. Rev. B 75, 140405 (2007)
"Reduction of the spin-wave damping induced by nonlinear effects"
G. de Loubens, V. V. Naletov, and O. Klein, Phys. Rev. B 71, 180411 (2005)
"Measurement of the ferromagnetic relaxation in a micron-size sample"
O. Klein, V. Charbois, V. V. Naletov, and C. Fermon, Phys. Rev. B 67, 220407 (2003)
"Individual Domain Wall Resistance in Submicron Ferromagnetic Structures"
R. Danneau et al. Phys. Rev. Lett. 88, 157201 (2002)
"Anisotropy of Domain Wall Resistance"
M. Viret, Y. Samson, P. Warin, A. Marty, F. Ott, E. Søndergård, O. Klein, and C. Fermon Phys. Rev. Lett. 85, 3962 (2000)
"Exchange Effects in an Artificial Atom at High Magnetic Fields"
O. Klein, C. de C. Chamon, D. Tang, D. M. Abusch-Magder, U. Meirav, X.-G. Wen, and M. A. Kastner, and S. J. Wind, Phys. Rev. Lett. 74, 785 (1995)
"89Y NMR study of the anisotropy of the static and dynamic susceptibilities in YBa2Cu3O6+x"
H. Alloul, A. Mahajan, H. Casalta, and O. Klein, Phys. Rev. Lett. 70, 1171 (1993)
"Critical magnetic fields in the superconducting state of K3C60"
K. Holczer, O. Klein, G. Grüner, J. D. Thompson, F. Diederich, and R. L. Whetten, Phys. Rev. Lett. 67, 271 (1991)
"Electrodynamics of the superconducting state of kappa(BEDT-TTF)2Cu(NCS)2"
O. Klein, K. Holczer, G. Grüner, J. J. Chang, and F. Wudl, Phys. Rev. Lett. 66, 655 (1991)
Miscellaneous:
Former graduate students:
- Vincent Charbois "Détection mécanique de la résonance ferromagnétique" (2003).
- Grégoire de Loubens "Spectroscopie micro-onde d'une nanostructure métallique magnétique hybride" (2005).
- Antoine Vanhaverbeke "Corrélations entre hétérogénéités magnétiques et transport électrique dans des nanostructures" (2005).
- Simone Borlenghi (co-supervised with X. Waintal, theory and simulations).
Teaching:
Senior Lecturer at École Polytechnique.