Annual meeting of the Swiss Physical Society 2018

【817】 Exploration of Topological Defects in Kagome Artificial Spin Ice via Magnetic Force Microscopy and Brillouin Light Scattering Spectroscopy

Aug 30, 2018, 3:45 PM

15m

CE 1 (EPFL)

Talk Magnetism and Spintronics at the Nanoscale Magnetism and Spintronics at the Nanoscale

Speaker

Dr Vinayak Shantaram Bhat (Institute of Materials and Laboratory of Nanoscale Magnetic Materials and Magnonics, École polytechnique fédérale de Lausanne (EPFL))

Description

Topological defects in kagome artificial spin ice (KASI)—arrays of interconnected nanomagnets on kagome lattice—appear in the form of monopole-antimonopole pairs and Dirac strings in the switching regime. Experimental determination of spin-precession frequencies of nanobars confined by topological defects has been elusive so far. However their understanding is key towards utilization of KASI as a 2D magnonic crystal. We, for the first time, devise an experimental protocol to systematically study the frequency response of nanobars (810 nm long, 120 nm wide, and 25 nm thick) confined by topological defects in KASI using the combination of magnetic force microscopy and Brillouin light spectroscopy.The work was supported by SNSF via grant number 163016.