SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.1: Poster
Thursday, March 30, 2023, 14:00–16:00, P2/EG
The spectrum of localized excitations of spin nanoclusters and their stability in a magnetic field — •Oksana Charkina1,2, Mikhail Bogdan2, and Igor Poltavsky1 — 1University of Luxembourg, L-1511 Luxembourg City, Luxembourg — 2B. Verkin ILTPE of NASU, Kharkiv, 61103, Ukraine
Engineering novel materials with predefined spectral and dynamical properties from recently synthesized giant magnetic molecules, permitting well-controlled exchange interaction, is essential for creating memory elements in modern computer technologies. To provide the necessary theoretical basis, we studied the structure and internal dynamics of spin nanoclusters limited by discrete domain walls in ferromagnetic chains placed in a magnetic field. The spin nanoclusters and their spectra of localized excitations are described analytically within the framework of the discrete Takeno-Homma equation [1], which fully accounts for the exchange interaction between spins. Explicit expressions for the internal mode oscillations were found, and the frequency dependences on the parameters of the exchange and the magnetic field were calculated. In addition, a stripe-like stability diagram and the Peierls energy barrier for the noncollinear discrete domain walls were established. We found that the magnetic field can effectively control the localization of information and energy on spin clusters. Our results can be used in developing spin-cluster resonance methods for investigating magneto-optical properties of a new class of low-dimensional metamaterials.
1. Takeno S. and Homma S., J.Phys.Soc.Jpn. 55, 2547 (1986).