About the influence of nuclear interactions on longitudinal magnetic relaxation of ⁵⁷Fe nuclei in YIG films

• Main Authors: Polulyakh, S.N., Sergeev, N.A.
• Format: Article
• Language: English
• Published: НТК «Інститут монокристалів» НАН України 2006
• Series: Functional Materials
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/144373

The effect of impurity ions on nuclear magnetic relaxation has been considered. It is supposed that an impurity ion introduces an excess electron (or a hole). As a result, magnetic ions with strong spin-orbital interaction appear and magnetization direction distribution becomes inhomogeneous. Thermally activated jumps of the excess electron from one magnetic ion to another generate fluctuations in the magnetization direction. The interaction between the fluctuating magnetization and magnetic nuclei results in the appearance of regions of fast nuclear magnetic relaxation. Spin diffusion contributes to the longitudinal relaxation rate also for nuclei being outside the impurity regions. Taking into account the spin diffusion dependence on nuclear interactions, we have derive the dependence of longitudinal relaxation rate on nuclear interactions, what was observed experimentally in [1]. An assumption about unintentional technological impurities is sufficient to explain the experimental data.