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Olivier KLEIN

Tél. : 04 38 78 58 02
Fax : 04 38 78 21 27
olivier.kleincea.fr

Functions:

CEA lead scientist in fundamental research on Condensed Matter

Responsability:

  • CEA-director of research
  • Group leader on spintronics of magnetic insulators at the CEA-Grenoble
  • Founder of the Magnetic Resonance Force Microscopy group at the CEA-Saclay
  • Senior expert in magnetic resonance spectroscopy for national and european agencies. Scientific officer for the CEE.

Research:

Olivier Klein has been the project leader in Europe on the development of Magnetic Resonance Force Microscopy (MRFM). The aim was to develop innovative tool to perform spectroscopy of magnetic nano-objects. 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.

In the past five years, he has been active in the spectroscopy of topological singular magnetic objects (e.g. vortices) as well as opening spintronics to magnetic oxides (e.g. YIG), which offer improved dynamical properties compared to their metallic counter-parts.

CV:

Olivier Klein is currently director of research at SPINTEC, CEA-Grenoble. After his graduation from ESPCI-Paris Tech in 1989, he obtained in 1993 a Ph.D. from UCLA studying the microwave properties of superconductors, followed by a PostDoctoral fellowship at MIT working on single electron transistors in GaAs. He has joined the CEA in 1996 to develop Magnetic Resonance Force Microscopy in France. Since, he obtained his Habilitation thesis from the University of Paris VI in 2004. After ten years at the Service de Physique de l’État Condensé (CEA-Saclay) devoted to the spectroscopy of magnetic nano-objects, he moved to SPINTEC (CEA-Grenoble) in 2014 where is current interest is spintronics of magnetic oxides. His areas of expertise are nanomagnetism, magnetic resonance, microwave spectroscopy and near field probe techniques.

Diploma:

  • Habilitation to direct research from Univ. P. et M. Curie Paris VI (2004)
  • Ph.D in physics from UCLA (1993)
  • Engineer from ESPCI – Paris Tech (1989)

Professional experience:

  • Present-2014: SPINTEC. Spin transfer effects in magnetic insulators. Engineering of the spin-wave spectrum
  • 2014-2000: Service de Physique de l’État Condensé, Saclay France. Magnetic resonance force spectroscopy on . Spin-wave confinement in nano-structures. Spin relaxation mechanisms. Non-linear dynamics in ferromagnets.
  • 2000-1996: École Polytechnique, Palaiseau France. Paramagnetic Resonance Imaging. Bubble and maze magnetic structures. Domain wall resistance.
  • 1995-1993: MIT, Cambridge USA. 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: UCLA, Los Angeles USA. 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.

Teaching:

  • 2000-2014 Senior lecturer at École Polytechnique on Condensed Matter Physics.

Scientific Publications:


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 150 papers in international journals and he has two patents. He supervised 12 PhD students

The sum of the times cited of his papers is greater than 3000. His h-index is currently 28.

Recent publications:

  1. “Full Control of the Spin-Wave Damping in a Magnetic Insulator Using Spin-Orbit Torque”
    A. Hamadeh, O. d’Allivy Kelly, C. Hahn, H. Meley, R. Bernard, A. H. Molpeceres, V. V. Naletov, M. Viret, A. Anane, V. Cros, S. O. Demokritov, J. L. Prieto, M. Muñoz, G. de Loubens, and O. Klein Phys. Rev. Lett. 113, 197203 (2014)
  2. “Origin of Spectral Purity and Tuning Sensitivity in a Spin Transfer Vortex Nano-Oscillator”
    A. Hamadeh, N. Locatelli, V. V. Naletov, R. Lebrun, G. de Loubens, J. Grollier, O. Klein, and V. Cros. Phys. Rev. Lett. 112, 257201 (2014)
  3. “Probing the Anharmonicity of the Potential Well for a Magnetic Vortex Core in a Nanodot”
    O. V. Sukhostavets, B. Pigeau, S. Sangiao, G. de Loubens, V. V. Naletov, and O. Klein,* at al. Phys. Rev. Lett. 111, 247601 (2013)
  4. “Detection of Microwave Spin Pumping Using the Inverse Spin Hall Effect”
    C. Hahn, G. de Loubens, M. Viret, and O. Klein et al. Phys. Rev. Lett. 111, 217204 (2013)
  5. “Measurement of the Dynamical Dipolar Coupling in a Pair of MagneticNanodisks Using a Ferromagnetic Resonance Force Microscope” B. Pigeau, C. Hahn, G. de Loubens, V. V. Naletov, and O. Klein Phys. Rev. Lett. 109, 247602 (2012)
  6. “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)
  7. “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)
  8. “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)
  9. “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)
  10. “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)
  11. “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)
  12. “Individual Domain Wall Resistance in Submicron Ferromagnetic Structures”
    R. Danneau et al. Phys. Rev. Lett. 88, 157201 (2002)
  13. “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)
  14. “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)
  15. “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)
  16. “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)
  17. “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)

Former graduate students:

  • Christian Hahn “Magnetization dynamics and pure spin currents in YIG/normal metal strucutres” (2014)
  • Abbass Hamadeh “Synchronization of spin-transfer nano-oscillators”(2014)
  • Benjamin Pigeau “Magnetic vortex dynamics in nanostructures” (2012)
  • Simone Borlenghi (co-supervised with X. Waintal, theory and simulations) (2011).
  • Antoine Vanhaverbeke “Corrélations entre hétérogénéités magnétiques et transport électrique dans des nanostructures” (2005).
  • Grégoire de Loubens “Spectroscopie micro-onde d’une nanostructure métallique magnétique hybride” (2005).
  • Vincent Charbois “Détection mécanique de la résonance ferromagnétique” (2003).

Miscellaneous:

In 2008 he coordinated the European project MASTER. In 2010 he organized the 3rd nano-MRI conference in Paris. In 2011, he co-organized a workshop on “Challenges and opportunities of Spin-Transfer Nano-Oscillators”.

PRL_88_157201_02.pdf JAP_89_6781_01.pdf EPJB_17_57_00.pdf PRL_98_127601-1.pdf PRB_78_144410.pdf Bistability of vortex core dynamics in a single perpendicularly magnetized nanodisk, PRL 102 (2009) 177602 (pdf).