Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 9, Pages 1990-1993Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.1990
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Small-angle neutron scattering experiments on nanostructured Fe, Co, and Ni reveal grain-size dependent magnetic correlations across grain boundaries. In Fe, a minimum of the correlation length is observed for grain sizes of the order of the bulk domain-wall width where the coercive field has a maximum. The results are explained within a generalization of the random-anisotropy model that takes into account domain-wall formation within grains and reduced interface coupling.
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