Abstract
We have performed neutron-scattering experiments to study the magnetic excitations of Tm in its low-temperature ferrimagnetic-antiphase-domain (FAD) phase. Our measurements confirm our earlier finding that the excitation spectrum of Tm in its FAD phase consists of one magnon mode with limited dispersion (8.3--9.6 meV). This result suggests that the Hamiltonian is dominated by the crystal-field-anisotropy energy and that the exchange interaction is relatively weak. Two additional lower-energy excitations have also been observed, and they have been identified as originating from magnetovibrational scattering from the TA phonon.
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