[en] In the present work the sign of Hsub(int) was measured for Ni₃[Fe(CN)₆]₂. The polycrystalline absorber was placed in an external longitudinal magnetic field of a superconducting solenoid. The temperature of the sample, 4.2K, was sufficiently below the Curie point Tsub(c)=19.5K and the magnitude of Hsub(ext) used was strong enough to orient the magnetic domains, also stronger than any possible induced fields. The Moessbauer experimental spectra are presented amounts to 265+-10 kOe, in agreement with earlier data. The observed expansion of the Zeeman pattern in the external field signifies the positive sign of Hsub(int)

[en] Density functional theory (DFT) calculations were performed to study the hydrogen adsorption over Ni₂-B (1 2 0) surface. The hydrogen adsorption energy was studied for both on-top and hollow sites. Adsorption energies calculated for all the sites were negative exhibiting their exothermic nature as well as stability. It was also deduced that the on top sites of both Ni and B were not stable sites. It was observed that though both threefold hollow sites as well as bridge sites were stable sites, the bridge site was more favored for hydrogen adsorption over threefold hollow site. The bridge site connecting Ni and B proved to be the most stable configuration for atomic hydrogen adsorption on Ni₂B (1 2 0) surface with bond length of 1.69 Å and 1.32 Å for Ni-H bond and B-H bond, respectively, and an adsorption energy of -0.30 eV. (author)

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[en] Evolution of the vortex lattice, the rhombus-square transition included, for LuNi₂B₂C in the field along the c crystal axis, is tracked by the decoration technique pushed up to the record high (for this method) field of 1480 Oe. Decoration images are analyzed with the help of the Fourier transform, which indicates disordered structures in small fields of a few Oe. In fields H<200 Oe the coexisting domains of different structures are observed. A technique based on the Fourier transform is employed to see the domains separately. The transition to the square lattice is recorded near 900 Oe. The results are in agreement with predictions of the nonlocal London theory

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[en] Three amorphous Ni₈₀B₂₀ samples have been produced by the melt-spinning technique using different wheel speeds. As a result, different amounts of quenched-in nuclei were formed in each sample. In this system, the density of quenched-in nuclei is reasoned to be proportional to the observed magnetic signal, and its influence on the crystallisation process is studied through differential scanning calorimetry

[en] Moessbauer spectroscopy measurements are performed at low temperatures on nickel ferrite nanoparticles. The thermal variation of the hyperfine splitting allows one to determine the anisotropy energy. Our results show that this energy is due to an enhanced surface contribution

[en] We present the static and dynamic results of engineered interlayer exchange coupled Ni₈₀Fe₂₀ (Py)/Ru continuous films and arrays of nanowires. We demonstrate a robust control of the coupling mechanism by varying the number of ferromagnetic layers and the thickness of Ru. We found that the antiferromagnetic coupling strength affects both the static and dynamic behaviors of the ferromagnetic layers (a strong antiferromagnetic coupling when the Ru thickness is 1 nm and negligible antiferromagnetic coupling when it is 1.4 nm). Most interestingly, multiple resonant modes were found for five-layer nanowires at remanence due to the interlayer exchange coupling. There is a good qualitative agreement between the experiment and the micromagnetic simulation. The results may suggest a novel way in the design of spintronic devices. (paper)

[en] We introduced a novel technique to fabricate a Microlattice-cored miniature sandwich panel with an ultralow density. This sandwich panel was made of a monolithic Ni-P foil without any bonding between the core and the faces. As a preliminary study, the mechanical properties were evaluated under compression in two different loading directions, and the effects of the face sheets added on the top and bottom were investigated in comparison to the conventional Microlattice without the face sheets. Under the out-of-plane compression, almost no difference was evident between the conventional Microlattice and the Microlattice sandwich in their compressive behaviors, because of the high friction with the compression platens. However, under the in-plane compression, the addition of the face sheets to the conventional Microlattice significantly increased the strength and stiffness, when the wall thickness was higher than a certain limit. Otherwise, the reinforcing effect became much less significant, because the very thin face sheets were easily buckled across the entire area even at the beginning of the loading.