125 citations · 356 across the 14 of their papers we have counts for
14 papers
Ballistic spin-transport properties of magnetic tunnel junctions with MnCr-based ferrimagnetic quaternary Heusler alloys
Tufan Roy, Masahito Tsujikawa, Masafumi Shirai
We investigate the suitability of nearly half-metallic ferrimagnetic quaternary Heusler alloys, CoCrMnZ (Z=Al, Ga, Si, Ge) to assess the feasibility as electrode materials of MgO-b…
Anisotropic magnetism and electronic structure of trigonal EuAlGe single crystals
Santanu Pakhira, Asish K. Kundu, Farhan Islam +10
The magnetic and electronic properties of the layered Zintl-phase compound EuAlGe crystallizing in the trigonal CaAlSi-type structure are reported. Our neutron-diff…
Electronic and magnetic properties of the topological semimetal SmMgBi
Asish K. Kundu, Santanu Pakhira, Tufan Roy +7
Dirac semimetals show nontrivial physical properties and can host exotic quantum states like Weyl semimetals and topological insulators under suitable external conditions. Here, by…
Topological electronic structure of YbMgBi and CaMgBi
Asish K. Kundu, Tufan Roy, Santanu Pakhira +6
Zintl compounds have been extensively studied for their outstanding thermoelectric properties, but their electronic structure remains largely unexplored. Here, we present a detaile…
IrCrMnZ (Z=Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions: A first-principles study
Tufan Roy, Masahito Tsujikawa, Masafumi Shirai
We study IrCrMnZ (Z=Al, Ga, Si, Ge) systems using first-principles calculations from the perspective of their application as the electrode materials of MgO-based MTJs. These materi…
Ab-initio study of electronic and magnetic properties of MnRuZ/MgO (001) heterojunctions (Z= Al, Ga, Si, Ge)
Tufan Roy, Masahito Tsujikawa, Masafumi Shirai
Using first-principles calculations, we studied MnRuZ (Z=Al, Ga, Si, Ge) and their heterojunctions with MgO along (001) direction. All these alloys possess HgCuTi-type inve…
Lattice Softening in Metastable bcc CoxMn100-x(001) Ferromagnetic Layers for a Strain-Less Magnetic Tunnel Junction
Kelvin Elphick, Kenta Yoshida, Tufan Roy +8
In spintronics, one of the long standing questions is why the MgO-based magnetic tunnel junction (MTJ) is almost the only option to achieve a large tunnelling magnetoresistance (TM…
Structural and magnetic properties of epitaxial films of CoIrMnAl equiatomic quaternary Heusler alloy designed from first-principles calculation
Ren Monma, Tufan Roy, Kazuya Suzuki +4
MgO-barrier magnetic tunnel junctions with half-metallic Heusler alloy electrodes attracted much attentions for spintronics applications. However, a couples of issues related to ma…
High tunnel magnetoresistance and magnetism in metastable bcc CoMn-based magnetic tunnel junctions
Kazuma Kunimatsu, Tufan Roy, Jun Okabayashi +7
Co-rich CoMn alloys have hcp or fcc disordered phases and those ferromagnetic orderings are significantly deteriorated with increasing Mn concentration in bulk. On…
Magnetic tunnel junctions with a B2-ordered CoFeCrAl equiatomic Heusler alloy
Tomoki Tsuchiya, Tufan Roy, Kelvin Elphick +8
The equiatomic quaternary Heusler alloy CoFeCrAl is a candidate material for spin-gapless semiconductors (SGSs). However, to date, there have been no experimental attempts at fabri…
Electric-field-induced changes of magnetic moments and magnetocrystalline anisotropy in ultrathin cobalt films
Takeshi Kawabe, Kohei Yoshikawa, Masahito Tsujikawa +10
In this study, the microscopic origins of the voltage-controlled magnetic anisotropy (VCMA) in 3d-ferromagnetic metals are revealed. Using in-situ X-ray fluorescence spectroscopy t…
Electronic and magnetic properties of off-stoichiometric CoMnSi/MgO interfaces studied by x-ray magnetic circular dichroism
V. R. Singh, V. K. Verma, K. Ishigami +8
We have studied the electronic and magnetic states of Co and Mn atoms at the interface of the CoMnSi (CMS)/MgO (=0.69, 0.99, 1.15 and 1.29) magnetic tunnel junc…
Origin of perpendicular magneto-crystalline anisotropy in L10-FeNi under tetragonal distortion
Yoshio Miura, Sho Ozaki, Yasushi Kuwahara +3
We investigated the origin of perpendicular magneto-crystalline anisotropy (MCA) in L10 ordered FeNi alloy using first-principles density-functional calculations. We found that the…
A first-principles study of tunneling magnetoresistance in Fe/MgAl2O4/Fe(001) magnetic tunnel junctions
Yoshio Miura, Shingo Muramoto, Kazutaka Abe +1
We investigated the spin-dependent transport properties of Fe/MgAl2O4/Fe(001) magnetic tunneling junctions (MTJs) on the basis of first-principles calculations of the electronic st…