Spin disorder in maghemite nanoparticles investigated using polarized neutrons and nuclear resonant scattering

Herlitschke, Marcus; Disch, Sabrina; Sergueev, I.; Schlage, Kai; Wetterskog, Erik; Bergstrom, Lennart; Hermann, Raphael P.

doi:10.1088/1742-6596/711/1/012002

Title: Spin disorder in maghemite nanoparticles investigated using polarized neutrons and nuclear resonant scattering

Journal Article · Wed May 11 00:00:00 EDT 2016 · Journal of Physics. Conference Series

DOI:https://doi.org/10.1088/1742-6596/711/1/012002· OSTI ID:1261381

Herlitschke, Marcus ^[1]; Disch, Sabrina ^[2]; Sergueev, I. ^[3]; Schlage, Kai ^[3]; Wetterskog, Erik ^[4]; Bergstrom, Lennart ^[5]; Hermann, Raphael P. ^[6]

Deutsches Elektronen-Synchrotron (DESY), Germany
Univ. of Cologne (Germany)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Uppsala Univ. (Sweden)
Stockholm Univ. (Sweden)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The manuscript reports the investigation of spin disorder in maghemite nanoparticles of different shape by a combination of polarized small-angle neutron scattering (SANSPOL) and nuclear forward scattering (NFS) techniques. Both methods are sensitive to magnetization on the nanoscale. SANSPOL allows for investigation of the particle morphology and spatial magnetization distribution and NFS extends this nanoscale information to the atomic scale, namely the orientation of the hyperfine field experienced by the iron nuclei. The studied nanospheres and nanocubes with diameters of 7.4nm and 10.6 nm, respectively, exhibit a significant spin disorder. This effect leads to a reduction of the magnetization to 44% and 58% of the theoretical maghemite bulk value, observed consistently by both techniques.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1261381

Journal Information:: Journal of Physics. Conference Series, Vol. 711; ISSN 1742-6588

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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