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The magnetic properties of the title compound have been studied by measurements of the nuclear spin‐lattice relaxation time T1, the uniform magnetization M, and by quasielastic and inelastic neutron scattering. The field and temperature dependence of T1 and the wave‐number dependence of the magnon excitation energy can be satisfactorily described by linear spin‐wave theory. A good description of M, however, requires a contribution from kink solitons. The available evidence suggests that, in contrast to the linear excitations, the nonlinear excitations in CHAB for B∥c can be described very well by a classical model, which is consistent with the interpretation of earlier heat‐capacity measurements.

Influence of linear and nonlinear excitations in the ferromagnetic S=1/2 chain system [C6H11NH3]CuBr3 (CHAB)