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Univ. Paris-Saclay
Magnetism, Frustration and Disorder
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In "Magnetism, Frustration and Disorder" group, our research interests are centered around the physics of ‘Complex Matters’. Currently, our research activities focus on the glass transitions and associated out-of-equilibrium dynamics in frustrated magnetic systems and structural glasses. In both cases, the individual elements (magnetic moments, molecular configurations)  cannot simultaneously minimize their respective energies globally, therefore the system as a whole will continues to "age" indefinitely searching for its true ground state.

 

Frustrated magnetic systems can either be disordered as in spin- and superspin- glasses (magnetic nano-object assemblies) or ordered as in the Kagome lattices. In addition, we study low temperature magnetic properties in a variety of materials such as superconductors and carbon nanotubes.

Within the "magnetism" branch of our group, we are currently investigating the following topics:

  • The FDT (Fluctutation and Dissipation Theorem) Violation in the Superspin Glass state of Frozen Ferrofluids

  • The Dynamical Correlation Length Growth in Superspin Glass State and Anisotropy Effects
  • Emergence of Collective Magnetic State in Supercrystals of Co Nanoparticles
  • Direct observation of magnetization reversal in magnetic nano-pillars (soon)

Our present "team members"

New: PhD research opportunity (in French)


 

The experimental techniques used in our lab include:

  CRYOGENIC S600 SQUID magnetometer - DC and AC magnetization and susceptibility measurements in applied magnetic field up to 5.5 Tesla. contact ( or )
  Dilution Refridgerator SQUID magnetometer - DC magnetization measurements down to 90 mK and up to 8000G. contact ( )
Micrometric magnetic field probe (2DEG micro-Hall sensor)- local magnetization measurements at low temperatures (4.2 K < T < 200K) and in magnetic fields. contact ( or )
Linear/Non-linear dielectric spectrometer (20 < T < 300K and 0.01Hz < f < 200kHz). contact ( or )
 

Maj : 26/10/2010 (930)

Voir aussi
Transition Vitreuse dans un Ferrofluide : En mettant des nanoparticules magnétiques en suspension dans un liquide, on obtient un ferrofluide.

 

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