dmi – Joo-Von Kim

Imaging antiferromagnets with a single spin magnetometer

20 September 201720 September 2017 admin

A consortium of research groups from the Universtié de Montpellier, Université Paris-Saclay, Universität Basel, CEA Saclay, and the Synchrotron SOLEIL has demonstrated the first real-space imaging of antiferromagnetic spin spirals in the multiferroic material bismuth iron oxide. The technique involves quantum sensing with a single spin magnetometer. A nice overview of this work can be found on the Oxitronics Group (UMPhy CNRS-Thales) website and on phys.org.

Reference: I. Gross et al., Nature 549, 252–256 (2017).

New post on our group website on our recent paper https://t.co/NZuW8ZR79T… https://t.co/cG6o4DDtvm… pic.twitter.com/XLpcr28pVN

— Oxitronics (@oxitronics) September 20, 2017

Quantum #sensors decipher #magneticordering in a new semiconducting material https://t.co/6ykF9w9gwd @unibasel @nature

— Phys.org (@physorg_com) September 13, 2017

Last modified 20/09/17

Spin Wave Power Flow and Caustics in Ultrathin Ferromagnets with the Dzyaloshinskii-Moriya Interaction

26 June 201628 June 2017 admin

Reference: J.-V. Kim, R. L. Stamps, and R. E. Camley, Phys. Rev. Lett. 117, 197204 (2016).

We examined how the Dzyaloshinskii-Moriya interaction (DMI) influences the flow of spin waves in ultrathin films using analytical theory and micromagnetics simulations. With a point source field excitation, we find a number of different propagation regimes, such as caustics and interference patterns that are asymmetric as a result of the DMI. This work has just appeared in Physical Review Letters.

Last modified 28/06/17

Role of nonlinear anisotropic damping in the magnetization dynamics of topological solitons

26 July 201526 July 2015 admin

Reference: J.-V. Kim, Phys. Rev. B 92, 014418 (2015).

By including the Rashba interaction into a model for nonlinear feedback damping, I studied how the dynamics of magnetic solitons, such as domain walls, vortices, and skyrmions, might be affected by additional torques resulting from this damping. This work has just appeared in Physical Review B.

Last modified 26/07/15

Narrow Magnonic Waveguides Based on Domain Walls

23 June 201523 June 2015 admin

Reference: F. Garcia-Sanchez et al., Phys. Rev. Lett. 114, 247206 (2015).

By using spin wave theory and micromagnetics simulations, we have shown that localized eigenmodes of magnetic domain walls can act as efficient waveguides for spin waves in ultrathin films. This work has just appeared in Physical Review Letters.

Last modified 23/06/15

Interfacial Dzyaloshinskii-Moriya interaction in perpendicularly magnetized Pt/Co/AlOx ultrathin films measured by Brillouin light spectroscopy

21 May 201516 June 2015 admin

Reference: M. Belmeguenai et al., Phys. Rev. B 91, 180405(R) (2015).

Our recent study on the strength of the Dzyaloshinskii-Moriya interaction in ultrathin Pt/Co/AlOx films has just appeared in Physical Review B.

Last modified 16/06/15