Small-Angle Neutron Scattering of Nanocrystalline Terbium with Random Paramagnetic Susceptibility

Balaji, G.; Ghosh, Sheuly; Döbrich, Frank; Eckerlebe, H.; Weißmüller, J.

doi:10.1103/physrevlett.100.227202

Cited by 9 publications

(14 citation statements)

References 18 publications

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“…The SANS technique has also been used to study a wide range of magnetic materials, for instance (in the last 10-15 years) magnetic SANS has been employed for investigating the microstructures of amorphous alloys [37][38][39][40][41], hard and soft magnetic nanocomposites [31,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57], elemental nanocrystalline 4f [58][59][60] and 3d magnets [61][62][63][64][65][66][67][68], the process of dynamic nuclear polarization [69][70][71], the flux-line lattice of superconductors [72,73], precipitates in steels [74][75][76][77], fractal magnetic domain structures in NdFeB permanent magnets [78], the spin structures of ferrofluids, nanoparticles, and nanowires [79][80][81]…”

Section: Introductionmentioning

confidence: 99%

Magnetic small-angle neutron scattering of bulk ferromagnets

Michels

2014

J. Phys.: Condens. Matter

109

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We summarize recent theoretical and experimental work in the field of magnetic small-angle neutron scattering (SANS) of bulk ferromagnets. The response of the magnetization to spatially inhomogeneous magnetic anisotropy and magnetostatic stray fields is computed using linearized micromagnetic theory, and the ensuing spin-misalignment SANS is deduced. Analysis of experimental magnetic-field-dependent SANS data of various nanocrystalline ferromagnets corroborates the usefulness of the approach, which provides important quantitative information on the magnetic-interaction parameters such as the exchange-stiffness constant, the mean magnetic anisotropy field, and the mean magnetostatic field due to jumps ΔM of the magnetization at internal interfaces. Besides the value of the applied magnetic field, it turns out to be the ratio of the magnetic anisotropy field Hp to ΔM, which determines the properties of the magnetic SANS cross-section of bulk ferromagnets; specifically, the angular anisotropy on a two-dimensional detector, the asymptotic power-law exponent, and the characteristic decay length of spin-misalignment fluctuations. For the two most often employed scattering geometries where the externally applied magnetic field H0 is either perpendicular or parallel to the wave vector k0 of the incoming neutron beam, we provide a compilation of the various unpolarized, half-polarized (SANSPOL), and uniaxial fully-polarized (POLARIS) SANS cross-sections of magnetic materials.

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Section: Introductionmentioning

confidence: 99%

Magnetic small-angle neutron scattering of bulk ferromagnets

Michels

2014

J. Phys.: Condens. Matter

109

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“…By contrast, the understanding of magnetic SANS is still at its beginning, although magnetic SANS has previously demonstrated great potential for resolving the spin structures of various magnetic materials. For instance (in the last decade), magnetic SANS has been employed for studying the microstructures of magnetic nanocomposites [10][11][12][13][14][15][16][17][18][19], amorphous alloys [20][21][22][23], and of elemental nanocrystalline bulk ferromagnets [24][25][26][27][28][29][30][31][32][33][34][35], the process of dynamic nuclear polarization [36], imaging of the flux-line lattice in superconductors [37,38], precipitates in steels [39], nanocrystalline rare-earth metals with random paramagnetic susceptibility [40], fractal magnetic domain structures in NdFeB permanent magnets [41], spin structures of ferrofluids, nanoparticles, and nanowires [42][43][44][45][46][47][48][49][50][51][52], magnetostriction in FeGa alloys…”

Section: Introductionmentioning

confidence: 99%

Micromagnetic simulation of magnetic small-angle neutron scattering from two-phase nanocomposites

Michels

Erokhin

Berkov

et al. 2014

Journal of Magnetism and Magnetic Materials

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The recent development of a micromagnetic simulation methodology-suitable for multiphase magnetic nanocomposites-permits the computation of the magnetic microstructure and of the associated magnetic small-angle neutron scattering (SANS) cross section of these materials. In this review article we summarize results on the micromagnetic simulation of magnetic SANS from two-phase nanocomposites. The decisive advantage of this approach resides in the possibility to srutinize the individual magnetization Fourier contributions to the total magnetic SANS cross section, rather than their sum, which is generally obtained from experiment. The procedure furnishes unique and fundamental information regarding magnetic neutron scattering from nanomagnets.

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“…As is well known, the anisotropy of the susceptibility tensor in rare-earth-based metals gives rise to a pronounced and peculiar field dependence of the SANS cross section in the paramagnetic temperature regime (T > T C ). Paramagnetic SANS has first been experimentally and theoretically investigated by Balaji et al [55] on terbium and then later by Döbrich et al [56] on holmium and gadolinium. With increasing field the SANS cross section increases, usually quite strongly, due to the pronounced magnetic anisotropy of these systems.…”

Section: Resultsmentioning

confidence: 99%