Field-induced magnetic structures in the chiral polar antiferromagnet Ni2_2InSbO6_6

We have performed $^{115}$In-NMR spectroscopy for Ni$_{2}$InSbO$_6$ with corundum-related crystal structure to reveal magnetic structures that develop in high magnetic fields. At low fields Ni$_{2}$InSbO$_6$ shows a helical magnetic order with a long wavelength because of its chiral and polar crystal structure. The field-induced magnetic state was not investigated by microscopic experiment because an extremely high magnetic field is required to modify the antiferromagnetically coupled helical structure. From the analysis of our $^{115}$In-NMR spectra obtained at high magnetic fields, we confirm that the canted antiferromagnetic structure appears in fields applied in the $[110]$ direction and the propagation vector of magnetic helix is rotated toward the field direction for fields in the $[001]$ direction. We discuss the effect of magnetic field that modifies the magnetic structure of an antiferromagnetic chiral magnet.Comment: 9 pages, 8 figures, accepted for publication from Phys. Rev.

A test-rework process yield performance model for estimation of printed wiring board assembly cost

This paper proposes a new test-rework process yield performance (TRePYP) model, combined with an assembly cost estimation algorithm, for an accurate representation of current practice in printed wiring board (PWB) assembly, especially in the design phase. The model captures the "dedicated" feature of PWB assembly activities and, instead of adopting lumped parameters, utilizes easy-to-measure process parameters so that both assembly performance and assembly cost can be evaluated. In the case study, changes in assembly cost due to lead-free conversion are estimated. Care is taken to ensure that the TRePYP method can account for both quality degradation issues and changes in the test-rework workload.Process yield Assembly cost Printed wiring boards Lead-free

Negative-chirality order in S = 1/2 kagome antiferromagnet CdCu3(OH)6(NO3)2·H2O

Neutron diffraction and nuclear magnetic resonance (NMR) measurements have been used to analyze the magnetic structure in the S = 1 2 kagome antiferromagnet CdCu 3 ( OH ) 6 ( NO 3 ) 2 ⋅ H 2 O . Below the magnetic ordering temperature T N ≃ 4 K , magnetic Bragg reflections at (101) and (100) were found in the neutron diffraction pattern, which suggests a q = 0 magnetic structure. Furthermore, the vector spin chirality for the q = 0 structure was successfully identified from the internal field direction obtained by the 14 N -NMR measurement, previous magnetization measurements, and magnetic symmetry analysis. Our findings point to a chirality-ordered magnetic structure with negative vector chirality and ⟨ 100 ⟩ anisotropy