Spin Waves in Ferrimagnets near the Angular Magnetization Compensation Temperature: A Micromagnetic Study
arxiv(2024)
摘要
Spin wave propagation along a ferrimagnetic strip with out-of-plane
magnetization is studied by means of micromagnetic simulations. The
ferrimagnetic material is considered as formed by two antiferromagnetically
coupled sublattices. Two critical temperatures can be defined for such systems:
that of magnetization compensation and that of angular momentum compensation,
both different due to distinct Landé factors for each sub-lattice. Spin waves
in the strip are excited by a spin current injected at one of its edges. The
obtained dispersion diagrams show exchange-dominated forward volume spin waves.
For a given excitation frequency, Néel vector describes highly eccentric
orbits, the eccentricity depending on temperature, whose semi-major axis are
oriented differently at distinct locations on the FiM strip.
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