EMA
EMA

Questions

Q&A 02.07.2025

  • Could you explain again the symmetry argument for the coupling of spin waves to rayleigh vs shear waves? (Mathias Weiler)
  • The reason for a K > 0 cubic anisotropy in bcc structures like Fe is clear because the electrons want to be far away from the other atoms. How does it look like for K < 0? Does it only exist in sc and fcc structures? (Mathias Weiler)
  • Slide 52. Do you think the ring shape after the second pulse is because of the magnetostriction of the material? (Stéphane Mangin)
  • I would like to have a more in depth discussion on the fundamentals of the magneto-optic absorption used in ultra-fast helicity independent magnetization switching (Aeres Ferreira or Stéphane Mangin ?)

Q&A 03.07.2025

  • We got to know that the thickness of the magnetic layer plays a crucial role in determining PMA. There is any particular range of thickness where anisotropy changes from perpendicular to in-plane anisotropy? (Stéphane Mangin or Bertand Dupé)

Q&A 04.07.2025

  • About multiferroics. As far as I've understood, when there is symmetry breaking in the crystal the lattice relaxes distorting in some way, similar as what happens in the Jahn Teller distortion? When this happens then the polarization creating ferroelectricity is a consequence of this new equilibrium distorted configuration. Is that correct? Also, could we start from a magnetic material and try different strain mechanisms to engineer multiferroic properties? (Eric Bousquet or Sebastian Meyer)
  • Can you explain the again the coupling between the polarization, the magnetization and the magnetic field. (Eric Bousquet or Sebastian Meyer)
  • when doing neutron diffraction, are real measurements biased by some " Bremsstrahlung" and, if yes, how is this noise being dealt with ? (Henrik Ronnow)
  • you showed that DMFT (which I don't remotely understand btw) can return correct quasiparticle peaks in strongly correlated cases. Once you have this response, can you back out its band index/spin/wavevector character to make a guess at its real many-body wavefunction? Or does it remain a little mysterious (Biblap Sanyal or Eric Bousquet)
  • Dednam et al. (10.1021/acsnano.2c11410) have shown that CISS can, in principle, emerge in non-chiral junctions if spatial symmetry is broken via the relative geometry of non-magnetic electrodes. In your opinion, what is the minimal symmetry breaking required at the interface to allow spin-selective transport in the absence of molecular chirality? Is STM a viable route to fabricate such asymmetric or even 3D electrode geometries, or would other techniques be more appropriate? (Aires Ferreira)
  • in experiments on chiral helices with of MoS2 nano sheets, contacted via indium-gallium eutectic (EGaIn), a rectifying behavior consistent with spin-selective transport is observed. In particular, a ‘double diode’ may be infered from current-voltage characteristics. Reversal of magnetization can be triggered by current-induced effects: could the observed switching in diode-like behavior be related to current-induced magnetization reversal in the underlying nichel domains? Specifically, in our setup we apply voltages up to +/-2 V, with currents typically ranging from E-05 A to E-02 A. The EGaIn contact area is approximately 50 um in diameter. Would local electric fields and current densities be sufficient to trigger switching of nichel domains? (Stéphane Mangin)

Q&A 08.07.2025

  • We can see PMA by varying Co thickness and SHE in Pt/Co System but what about Au/Co system? (Ekkes Brück)
  • Most memristor-based neuromorphic systems use spiking neural networks, why did you choose a spin reservoir computing approach instead for skyrmions? If I understood correctly, the signal shows spikes depending on space and time. (Jack Gartside)
  • In many reservoir computing applications, especially for complex classification tasks, the input signal often needs to be preprocessed to make it compatible with the electrical control of the device. To what extent can such preprocessing enhance or hide the true performance of the reservoir? Additionally, how can we fairly compare the performance of different reservoir computing systems? (Jack Gartside)