A. B. Drovosekov, N. M. Kreines, A. S. Barkalova, S. N. Nikolaev, A. V. Sitnikov, V. V. Rylkov, “Effect of slow ion relaxation at ferromagnetic resonance in a CoFeB–LiNbO metal-insulator nanocomposite”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2020, Volume 112, Issue 2,Pages <nobr>88

This article is cited in 5 papers

CONDENSED MATTER

Effect of slow ion relaxation at ferromagnetic resonance in a CoFeB–LiNbO metal-insulator nanocomposite

A. B. Drovosekov^a, N. M. Kreines^a, A. S. Barkalova^ab, S. N. Nikolaev^c, A. V. Sitnikov^d, V. V. Rylkov^ec

^a Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow, 119334 Russia
^b National Research University, Higher School of Economics, Moscow, 101000 Russia
^c National Research Center Kurchatov Institute, Moscow, 123182 Russia
^d Voronezh State Technical University, Voronezh, 394026 Russia
^e Institute of Radio Engineering and Electronics (Fryazino Branch), Russian Academy of Sciences, Fryazino, Moscow region, 141190 Russia

Abstract: Metal-insulator nanocomposite (CoFeB)$_x$(LiNbO$_3$)$_{100-x}$ films are studied by the ferromagnetic resonance method in the temperature range of 4–320 K. In the low-temperature region, the maximum of the ferromagnetic resonance linewidth and a negative dynamic shift of the absorption peak, typical of the mechanism of slow ion relaxation on magnetic impurities, are found. The observed magnetic relaxation features can be caused by paramagnetic Co and Fe ions, which are dispersed in the dielectric LiNbO$_3$ matrix and are exchange-coupled to ferromagnetic CoFeB granules. Experimental temperature dependences of the ferromagnetic resonance linewidth and shift are in good agreement with theoretical curves obtained within the proposed approach.

Received: 28.05.2020
Revised: 03.06.2020
Accepted: 04.06.2020

DOI: 10.31857/S1234567820140049