Abstract
Thermal cycling of thin foil samples is used to measure nuclear spin lattice relaxation of dilute58Co and60Co in iron at polarizing fields up to 1.3 T. The relaxation rates for the two isotopes differ by a factor of 7.1; the good agreement between the high field values for γ2C2, (2.93±0.15)·1015 K·s−1·T−2 (58Co) and (3.01±0.06)·1015K·s−1·T−2 (60Co) verifies the reliability of the experimental method. An enhancement factor model is introduced and shown to give an excellent reproduction of the observed field dependence of the relaxation.
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