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External Field Dependence of Fe⁵⁷NMR in Pure Iron

Journal of Magnetics, Volume 1, Number 1, 30 Jun 1996, Pages 14-18

Joongheo Dho(Department of Physics, Korea Advanced Insitute of Science and Technology), Mincheol Kim(Department of Physics, Korea Advanced Insitute of Science and Technology), Soonchil Lee(Department of Physics, Korea Advanced Insitute of Science and Technology), Wonjong Lee(Department of material science, Korea Advanced Institute of Science and Technology), Yoonbae Kim(Korea Reaearch Institute of Standards and Science)

Abstract

The NMR spin echo in pure iron was measured as a function of external magnetic field up to 10 kgauss at room temperature. We observed the signal coming from a single domain formed over 7.5 kgauss which has not been detected in previous works. The resonance frequency shift with external field confirmed that the hyperfine field in iron is -330.2 kgauss. From the comparison of the magnetization curve with the domain wall signal and the resonance frequency in external field, we showed that NMR could give the useful qualitative information on the magnetization process. The extent of the internal strain removed by annealing, which can be hardly seen in hysteresis curves, was clearly shown up in the NMR line-width.

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