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Grain-size dependence of intergranular magnetic correlations in nanostructured metals

Löffler, Jörg F. and Wagner, Werner and Kostorz, Gernot (2000) Grain-size dependence of intergranular magnetic correlations in nanostructured metals. Journal of Applied Crystallography, 33 (3). pp. 451-455. ISSN 0021-8898. doi:10.1107/S0021889800099970.

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Magnetic small-angle neutron scattering experiments were performed on nanostructured Fe, Co and Ni samples of varying grain size, produced by inert-gas condensation. The experiments show that the spontaneous spatial magnetic correlations forming in zero-field extend over many individual grains. These correlations depend strongly on grain size. In Fe, they have a minimum at a grain size of around 35 nm and increase sharply for smaller grain sizes. The crossover occurs at grain sizes comparable with L_(crit) = πδ, where δ is the bulk domain-wall width. For grain sizes below L_(crit), the results are explained on the basis of the random-anisotropy model, which takes into account that the magnetic alignment between the grains competes with the anisotropies of the individual grains. Above L_(crit), where domain walls can form within one grain, the magnetization direction corresponds to the anisotropy direction varying from grain to grain, and the magnetic correlation length increases approximately linearly with grain size. Furthermore, the measurements on Fe, Co and Ni show that the spatial magnetic correlations measured by SANS are always larger than L_(crit). This is in agreement with results of theoretical studies showing that nonuniform magnetization configurations can only exist in grains with sizes D > L_(crit).

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Additional Information:© 2000 International Union of Crystallography. The SANS experiments were performed in collaboration with A. Wiedenmann (HMI Berlin). The authors acknowledge stimulating discussions with H. B. Braun (PSI Villigen) and A. Wiedenmann. The work was supported by the Swiss National Science Foundation and by the Alexander von Humboldt Foundation via the Feodor Lynen Program (J. L.).
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Swiss National Science Foundation (SNSF)UNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20160914-093335391
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Official Citation:Loffler, J. F., Wagner, W. & Kostorz, G. (2000). J. Appl. Cryst. 33, 451-455
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70335
Deposited By: Tony Diaz
Deposited On:29 Sep 2016 23:32
Last Modified:11 Nov 2021 04:27

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