000308194 001__ 308194
000308194 005__ 20240928181440.0
000308194 0247_ $$aG:(GEPRIS)24982846$$d24982846
000308194 035__ $$aG:(GEPRIS)24982846
000308194 040__ $$aGEPRIS$$chttp://gepris.its.kfa-juelich.de
000308194 150__ $$aMagnetic microstructure and range of critical magnetic correlations in nanocrystalline gadolinium$$y2006 - 2014
000308194 371__ $$aProfessor Dr. Andreas Michels
000308194 450__ $$aDFG project G:(GEPRIS)24982846$$wd$$y2006 - 2014
000308194 5101_ $$0I:(DE-588b)2007744-0$$aDeutsche Forschungsgemeinschaft$$bDFG
000308194 680__ $$aWe will study the influence of internal interfaces (grain and phase boundaries) on the Curie transition and on the magnetic microstructure of nanocrystalline bulk gadolinium and nanocrystalline gadolinium alloys. High-quality nanocrystalline bulk gadolinium samples can now be prepared by the inert-gas condensation technique, and their magnetic properties will be investigated by means of magnetometry, specific-heat measurements, neutron diffraction, and in particular by measurements using magnetic small-angle neutron scattering on the low-capturing isotope 160gadolinium. Magneticfield dependent small-angle neutron scattering in conjunction with the theory of micromagnetics is a novel approach which allows one to determine the set of intrinsic interaction parameters of a ferromagnet such as exchange constant, anisotropy field, stray field, and a characteristic length of spin misalignment. By alloying nanocrystalline gadolinium with the highly anisotropic rare-earth metal terbium, we aim at tailoring increasing magnetic anisotropy and study its effect on the magnetic interactions. Furthermore, we propose to study the effect of grain-boundary chemistry on the magnetic behavior by alloying nanocrystalline gadolinium with the nonmagnetic element tantalum which exhibits a strong tendency to interfacial segregation. In particular, by varying the tantalum interfacial excess concentration, we are able to study the mechanism of exchange coupling across grain boundaries.
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000308194 909CO $$ooai:juser.fz-juelich.de:975069
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000308194 980__ $$aAUTHORITY