Magnetic and electrical properties of RCo2Mn (R=Ho, Er) compounds

The RCo2Mn (R= Ho and Er) alloys, crystallizing in the cubic MgCu2-type structure, are isostructural to RCo2 compounds. The excess Mn occupies both the R and the Co atomic positions. Magnetic, electrical and heat capacity measurements have been done in these comounds. The Curie temperature is found to be 248 K and 222 K for HoCo2Mn and ErCo2Mn respectively, which are considerably higher than that of the corresponding RCo2 compounds. Saturation magnetization values calculated in these samples are less compared to that of the corresponding RCo2 compounds. Heat capacity data have been fitted with the nonmagnetic contribution with Debye temperature =250 K and electronic coefficient=26 mJ mol^-1K^-2.Comment: 13 pages, 5 figures, 2 table

Effect of seed layer thickness on the Ta crystalline phase and spin Hall angle

In this study, extensive large-scale model pavement experiments consisting of a total of twenty-one pavement sections overlying different subgrade conditions (poor to firm) were conducted to determine the traffic benefit ratio (TBR). TBR is quantified as the ratio of a cumulative number of load cycles to reach a defined deformation/failure state in the reinforced section to that of the unreinforced section with the same pavement geometry and material constitutions. Biaxial geogrids made up of polyester and polypropylene of varying tensile strengths were considered. The controlled experimentation was carried out in a large-sized test chamber of dimensions equal to 1.5 m in length, 1.5 m in width, and 1.0 m in depth. To simulate the wheel loading on the pavement in a real field condition, repetitive loading was applied in the form of haversine loading using a linear actuator system of 100 kN capacity. Based on the studies, geogrid placed at one-third thickness of the base layer was found to be the optimal depth of reinforcement. TBRs of the reinforced pavement were found to range from 1 to 52. The study, however, recommends the use of TBR ranging from 1.5 to 4 for a conservative design. Finally, the TBR-based design of pavements was illustrated through a worked-out example for given input parameters. The thickness of aggregate layers was found to reduce by 7.5–29% for the range of California bearing ratios and TBRs considered in this study. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature

Anomalous magnetoresistive behavior in Ni44Co2Mn43In11 alloy

We conducted the temperature (T) and magnetic field (H) dependence of resistivity (ρ) on Ni44Co2Mn43In11 compound under the magnetic field (H=) 0-70 kOe in the temperature range T=150-380 K. Several novel anomalies are observed in the ρ(T,H) behaviour of this compound which upto our knowledge were not reported earlier in these systems. An unusual change in ρ(T) associated with a positive manetoresistance (MR) is also observed just above the martensite transformation (MT) in the temperature range of T=308-320 K. In addition, an anomalous field dependence of the MR is observed in temperature region T=305-310 K, where ρ increases with H after reaching minimum. Furthermore, a large MR up to -65 % is observed across its room temperature MT which can be beneficial for practical applications. The possible origin of the observed MR behaviour is discussed in terms enhanced magnetic scattering