Spin-wave contributions to nuclear magnetic relaxation in magnetic metals
Institute of Metal Physics, 620219 Ekaterinburg, Russia
Corresponding author: a firstname.lastname@example.org
Revised: 6 June 2000
Published online: 15 February 2001
The longitudinal and transverse nuclear magnetic relaxation rates and are calculated for three- and two-dimensional (3D and 2D) metallic ferro- and antiferromagnets (FM and AFM) with localized magnetic moments in the spin-wave temperature region. The contribution of the one-magnon decay processes is strongly enhanced in comparison with the standard T-linear Korringa term, especially for the FM case. For the 3D AFM case this contribution diverges logarithmically, the divergence being cut at the magnon gap due to magnetic anisotropy, and for the 2D AFM case as . The electron-magnon scattering processes yield and -terms in for the 3D AFM and 2D FM cases, respectively. The two-magnon ("Raman") contributions are investigated and demonstrated to be large in the 2D FM case. Peculiarities of the isotropic 2D limit (where the correlation length is very large) are analyzed.
PACS: 76.60.-k – Nuclear magnetic resonance and relaxation / 75.30.Ds – Spin waves
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001