Translational mode excitation of a nano-skyrmion lattice by radio-frequency scanning tunneling microscopy

Hung-Hsiang Yang^1*, Marie Hervé², Louise Desplat³, Volodymyr P. Kravchuk¹, Timofey Balashov⁴, Philipp Markus¹, Patrick Buhl⁵, Paul Antoine Hervieux³, Markus Garst¹, Bertrand Dupé^6,7

¹Physical Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany
²Institut des NanoSciences de Paris, Sorbonne University and CNRS-UMR7588, Paris, France
³Institute Physical And Chemistry Materials De Strasbourg, University of Strasbourg, Strasbourg, France
⁴II. Physikalisches Institut B, RWTH Aachen University, Aachen, Germany
⁵Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany
⁶Fonds de la Recherche Scientifique, FNRS, Bruxelles, Belgium
⁷Nanomat/Q-mat/CESAM, University of Liège, Sart Tilman, Belgium

* Presenter:Hung-Hsiang Yang, email:hung-hsiang.yang@kit.edu

Recent developments of implementing radio-frequency voltage modulation into a scanning tunneling microscope have revealed great insights into the spin dynamics of single atoms. However, up to now most of the observed single-atom electron spin resonance relied on the modulated tip-subject displacements for generating ac magnetic fields. The accessible systems, thereby, are limited to single spins adsorbed on insulating thin films specifically on the MgO surfaces. Here, we demonstrated an alternative utilizing the spin-transfer torque for inducing effective ac magnetic fields and in turn expanding the experiments towards the ferromagnetic resonance regime on a skyrmion lattice.

Keywords: radio-frequency scanning tunneling microscopy, spin-polarized scanning tunneling microscopy, nano-skyrmion lattice