  Resonant spin dynamics of topological spin textures are correlated with their
topological nature, which can be employed to understand this nature. In this
study, we present resonant spin dynamics of three-dimensional topological spin
texture, i.e., Neel and Bloch hopfions. Using micromagnetic simulations, we
stabilize Bloch and Neel hopfions with bulk and interfacial
Dzyaloshinskii-Moriya interaction (DMI), respectively. We identify the ground
state spin configuration of both hopfions, effects of anisotropies, geometric
confinements, and demagnetizing fields. To confirm topological nature, Hopf
number is calculated for each spin texture. Then, we calculate the resonance
frequencies and spin-wave modes of spin precessions under multiple magnetic
fields. Unique resonance frequencies and specific magnetic field dependence can
help to guide experimental studies to identify the three-dimensional
topological spin texture of hopfions in functioning chiral magnets when imaging
is not possible.
