Magnon Modes of Microstates and Microwave-Induced Avalanche in Kagome Artificial Spin Ice with Topological Defects

V S Bhat; S Watanabe; K Baumgaertl; A Kleibert; M A W Schoen; C A F Vaz; D Grundler

doi:10.1103/PhysRevLett.125.117208

Magnon Modes of Microstates and Microwave-Induced Avalanche in Kagome Artificial Spin Ice with Topological Defects

Phys Rev Lett. 2020 Sep 11;125(11):117208. doi: 10.1103/PhysRevLett.125.117208.

Authors

V S Bhat^{1

2}, S Watanabe¹, K Baumgaertl¹, A Kleibert³, M A W Schoen³, C A F Vaz³, D Grundler^{1

4}

Affiliations

¹ Institute of Materials, Laboratory of Nanoscale Magnetic Materials and Magnonics, School of Engineering, École Polytechnique Fédérale de Lausanne EPFL, 1015 Lausanne, Switzerland.
² International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland.
³ Swiss Light Source, Paul Scherrer Institute, 5232 PSI Villigen, Switzerland.
⁴ Institute of Microengineering, Laboratory of Nanoscale Magnetic Materials and Magnonics, School of Engineering, École Polytechnique Fédérale de Lausanne EPFL, 1015 Lausanne, Switzerland.

PMID: 32975965
DOI: 10.1103/PhysRevLett.125.117208

Abstract

We investigate spin dynamics of microstates in artificial spin ice (ASI) in Ni_{81}Fe_{19} nanomagnets arranged in an interconnected kagome lattice using microfocus Brillouin light scattering, broadband ferromagnetic resonance, magnetic force microscopy, x-ray photoemission electron microscopy, and simulations. We experimentally reconfigure microstates in ASI using a 2D vector field protocol and apply microwave-assisted switching to intentionally trigger reversal. Our work is key for the creation of avalanches inside the kagome ASI and reprogrammable magnonics based on ASIs.