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Nuclear magnetic relaxation in the domain and domain wall of pure iron

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1550-235X, Vol: 56, Issue: 13, Page: 7835-7838
1997
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The nuclear magnetic relaxation times in the domain and domain wall of pure natural iron have been measured separately. We have witnessed that the spin-spin relaxation time (Formula presented) is longer than the spin-lattice relaxation time (Formula presented) in the domain wall. The ratio (Formula presented) increases and approaches 2 with decreasing rf pulse power level. This is due to the anisotropy in the fluctuation of the hyperfine field by single magnon processes or wall-type excitations. The measured spin-spin relaxation rate is well described by the sum of the nonsecular term and the dipole-dipole interaction term. © 1997 The American Physical Society.

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