Inversion of the domain wall propagation in synthetic ferrimagnets

Reference: A. Hamadeh, P. Pirro, J.-P. Adam et al., Appl. Phys. Lett. 111, 022407 (2017).

In collaboration with colleagues at the Institut Jean Lamour (Nancy), we investigated domain wall propagation in synthetic ferrimagnets under applied magnetic fields. Depending on the relative alignment of the two component layers (parallel or antiparallel), different velocity versus field regimes are observed. This behaviour results from the competition between the external applied field and the interlayer coupling. This work has just appeared in Applied Physics Letters.

New ANR projects funded!

The NOMADE group has secured funding for two projects in the latest ANR Call for Projects:

  • Chaos-based information processing with magnetic nano-oscillators (CHIPMuNCS), which will be coordinated by Joo-Von Kim and involve colleagues at the Laboratoire Matériaux Optiques, Photonique et Systèmes (CentraleSupélec/Univ. Lorraine), Institut Jean Lamour (CNRS/Univ. Lorraine), and Unité Mixte de Physique CNRS/Thales.
  • Topological properties of magnetic skyrmions and opportunities for novel spintronic devices (TOPSKY), which will be coordinated by Vincent Cros of Unité Mixte de Physique CNRS/Thales and involve colleagues from the Laboratoire de Physique des Solides (CNRS/Univ. Paris-Sud), Institut Néel (CNRS/Univ. Grenoble), Laboratoire Charles Coulomb (CNRS/Univ. Montpellier), and the CEA Saclay.

Postdoc offer: Magnetoresistive detection of confined spin waves in domain walls

Context

A periodic disturbance in local ferromagnetic ordering can propagate in a magnetic material in the form of a wave called a spin wave or a magnon. “Magnonics” is a field of research for the forthcoming beyond CMOS era; it harnesses magnons to transmit and process information using sophisticated spin wave devices and conduits. The standard spin wave conduits rely on spin waves in in-plane magnetized materials. There the spin waves are difficult to guide in curved conduits because of their anisotropic dispersion properties. Besides, miniaturization to deep sub-micron dimensions is a challenge as spin waves are sensitive to structural changes such as lithography-induced roughness at the conduit edges.

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