“Magnetic Resonance Force Microscopy: a spectroscopic tool for nano-objects ” by Olivier Klein (Service de Physique de l'État Condensé)

Date: 
Friday, August 22, 2014 - 3:00pm
Series: 
Condensed Matter Physics Seminar

In PAB room 4-330

Since the end of the nineties [1], the magnetic resonance group at the CEA-Saclay has led an effort to develop  a generic tool, combining magnetic force microscopy and magnetic resonance imaging, called magnetic resonance force microscopy (MRFM), whose purpose is to provide a spectroscopic signature on the individual nature of potentially buried nano-object. In this talk we will review the progress obtained by MRFM on the study of the magnetization dynamics [2] in circular nanodots (saturated and vortex ground state). The talk will concentrate on the fundamental problematic of phase synchronization of spin-transfert nano-oscillators [3]. The practical interest of phase-locking phenomena is that they are a powerful mean to improve the figure of merit of these very agile rf source.

Bibliography:

1.     “Mechanical detection of nuclear spin relaxation in a micron-size crystal”,O. Klein et al.  Eur. Phys. J. B 17, 57–68 (2000)

2.     “Ferromagnetic resonance force spectroscopy of individual submicron-size samples”, O. Klein et al. PRB 78, 144410 (2008)

3.     “Identification and selection rules of the spin-wave eigenmodes in a normally magnetized nano-pillar”. V. V. Naletov et al. PRB 84, 224423 (2011)