P. K. Rout

Charge transport and magnetic ordering in laser ablated Co2FeSi thin films epitaxially grown on (1 0 0) SrTiO3

We have successfully deposited epitaxial thin films of the Heusler alloy Co2FeSi on (1 0 0) cut SrTiO3 single crystal substrates by pulsed laser deposition. X-ray diffraction reveals the L21 cubic crystal structure for the films grown at 400 and 600 °C, with a better crystallographic quality at the higher growth temperature. The magnetic moment in saturation of the 600 °C grown film is 5.0 µB/fu at 5 K with the easy axis of magnetization in the (1 0 0) plane. Inplane hysteresis measurements suggest a soft magnetic state with a coercive field HC ≈ 250 Oe at 5 K for the 600 °C film which decreases on lowering the growth temperature. The normalized magnetization of thin films follows the well-known Bloch T3/2 law due to spin wave excitation. Electrical resistivity measurements on the films with the L21 crystal structure show a pronounced metallic behaviour down to the lowest temperature of measurement (≈5 K), and enhanced metallicity in the 600 °C film as indicated by its lower residual resistivity (≈0.16 µΩ cm) and higher residual resistivity ratio (RRR ≈ 1280). These results suggest that films grown at the higher temperature may be better suited for the fabrication of magnetic tunnel junctions.

Magnetoelastic coupling induced magnetic anisotropy in Co2(Fe/Mn)Si thin films

We report the influence of in-plane strain on uniaxial magnetic anisotropy of Co2(Fe/Mn)Si [CF(M)S] films grown on SrTiO3 (STO) and MgO by varying film thickness. The analysis of magnetic free energy functional for the films on STO showed the presence of magnetoelastic anisotropy with magnetostriction constant of 12.22 × 10−6 for CFS and 2.02 × 10−6 for CMS in addition to intrinsic magnetocrystalline anisotropy. Single-domain phase diagram reveals a gradual transition from in-plane to canted state with decreasing film thickness due to strain-induced tetragonal distortion. A maximum canting angle of 41.5° with respect to film plane is predicted for CFS (12 nm)/STO film.

Strain induced magnetic domain evolution and spin reorientation transition in epitaxial manganite films

The evolution of magnetic domain structure in epitaxial La0.625Ca0.375MnO3 films on (001) NdGaO3 is monitored as a function of temperature and magnetic field using magnetic force microscopy. We see two distinct regions of magnetic orientational order: one in-plane displaying contrast-less image and the other tilted away from the film plane forming a distinct stripe pattern. A strong domain splitting is observed at the boundary of two regions, which is resilient to reorientation with temperature and magnetic field. We propose a model magnetic free energy functional to explain the mechanism of domain splitting seen in manganite films.

Two-dimensional electron-gas-like charge transport at the interface between a magnetic Heusler alloy and SrTiO3

P. K. Rout, Himanshu Pandey, Lijun Wu, Anupam, P. C. Joshi, Z. Hossain, Yimei Zhu, and R. C. Budhani Condensed Matter Low Dimensional Systems Laboratory, Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India Brookhaven National Laboratory, Upton, NY 11973, USA CSIR-National Physical Laboratory, New Delhi 110012, India (P.K.R. and H.P. contributed equally to this research.) (Dated: May 2, 2014)

Interface superconductivity in La1.48Nd0.4Sr0.12CuO4/La1.84Sr0.16CuO4 bilayers

We identify a distinct superconducting phase at the interface of a La

Effect of pressure on itinerant magnetism and spin disorder in cubic FeGe

_{1.48}

Interface Superconductivity in La1.48Nd0.4Sr0.12CuO4/La1.84Sr0.16CuO4 Bilayers

Nd

Electronic reconstruction and enhanced superconductivity at La1.6−xNd0.4SrxCuO4/La1.55Sr0.45CuO4 bilayer interface

_{0.4}

Role of magnetoelastic coupling in magnetic anisotropy of Co

Sr

_{2}

_{0.12}