Details

Autor(en) / Beteiligte

• Dubowik, J.
• Kuświk, P.
• Matczak, M.
• Bednarski, W.
• Stobiecki, F.
• Aleshkevych, P.
• Szymczak, H.
• Kisielewski, M.
• Kisielewski, J.

Titel

Ferromagnetic resonance and resonance modes in kagome lattices: From an open to a closed kagome structure

Ist Teil von

• Physical review. B, 2016-06, Vol.93 (22), Article 224423

Erscheinungsjahr

2016

Link zum Volltext

Quelle

APS: American Physical Society E-Journals (Physics)

Beschreibungen/Notizen

• We present ferromagnetic resonance (FMR) investigations of 20 nm thick permalloy (Ni sub(80) Fe sub(20)) elements (width W=200 nm, length L=470 nm, period a=500 nm) arranged in open and closed artificial kagome lattices. The measurements were done at 9.4 and 34 GHz to ensure a saturated or near-saturated magnetic state of the kagome structures. The FMR data are analyzed in the framework of an analytical macrospin model which grasps the essential features of the bulk and edge modes at these microwave frequencies and is in agreement with the results of micromagnetic simulations. Polar plots of the resonance fields versus the field angle made by the direction of the magnetic field with respect to the main symmetry directions of the kagome lattice are compared with the results of the analytical model. The measured FMR spectra with a sixfold rotational symmetry qualitatively reproduce the structure expected from the theory. Magnetic dipolar interactions between the elements of the kagome lattices result in the mixing of edge and bulklike excitations at 9.4 GHz and in a systematic deviation from the model, especially for the closed kagome lattice.