Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Roy, Tufan"'
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-based magnetic tunnel junctions (MTJ). Low magnetic moments of these al
Externí odkaz:
http://arxiv.org/abs/2307.16442
Autor:
Pakhira, Santanu, Kundu, Asish K., Islam, Farhan, Tanatar, M. A., Roy, Tufan, Heitmann, Thomas, Yilmaz, T., Vescovo, E., Tsujikawa, Masahito, Shirai, Masafumi, Prozorov, R., Vaknin, David, Johnston, D. C.
Publikováno v:
Phys. Rev. B 107, 134439 (2023); 16 pages
The magnetic and electronic properties of the layered Zintl-phase compound EuAl$_2$Ge$_2$ crystallizing in the trigonal CaAl$_2$Si$_2$-type structure are reported. Our neutron-diffraction measurements show that EuAl$_2$Ge$_2$ undergoes A-type antifer
Externí odkaz:
http://arxiv.org/abs/2301.09613
Autor:
Kundu, Asish K., Pakhira, Santanu, Roy, Tufan, Yilmaz, T., Tsujikawa, Masahito, Shirai, Masafumi, Vescovo, E., Johnston, D. C., Pasupathy, Abhay N., Valla, Tonica
Publikováno v:
Phys. Rev. B 106, 245131 (2022)
Dirac semimetals show nontrivial physical properties and can host exotic quantum states like Weyl semimetals and topological insulators under suitable external conditions. Here, by combining angle-resolved photoemission spectroscopy measurements (ARP
Externí odkaz:
http://arxiv.org/abs/2209.12109
Autor:
Kundu, Asish K., Roy, Tufan, Pakhira, Santanu, Wu, Ze-Bin, Tsujikawa, Masahito, Shirai, Masafumi, Johnston, D. C., Pasupathy, Abhay N., Valla, Tonica
Publikováno v:
npj quantum materials 7, 67 (2022)
Zintl compounds have been extensively studied for their outstanding thermoelectric properties, but their electronic structure remains largely unexplored. Here, we present a detailed investigation of the electronic structure of the isostructural therm
Externí odkaz:
http://arxiv.org/abs/2205.03678
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 materials have highly spin-polarized conduction electrons with partially occ
Externí odkaz:
http://arxiv.org/abs/2108.08501
Publikováno v:
J. Phys.: Condens. Matter 33 (2021) 145505 (9pp)
Using first-principles calculations, we studied Mn$_2$RuZ (Z=Al, Ga, Si, Ge) and their heterojunctions with MgO along (001) direction. All these alloys possess Hg$_2$CuTi-type inverse Heusler alloy structure and ferrimagnetic ground state. Our study
Externí odkaz:
http://arxiv.org/abs/2010.06761
Autor:
Elphick, Kelvin, Yoshida, Kenta, Roy, Tufan, Ichinose, Tomohiro, Kunimatsu, Kazuma, Tsuchiya, Tomoki, Tsujikawa, Masahito, Nagai, Yasuyoshi, Mizukami, Shigemi, Shirai, Masafumi, Hirohata, Atsufumi
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 (TMR) ratio at room temperature (RT) but not as large as the theoretical
Externí odkaz:
http://arxiv.org/abs/2010.04493
Autor:
Monma, Ren, Roy, Tufan, Suzuki, Kazuya, Tsuchiya, Tomoki, Tsujikawa, Masahito, Mizukami, Shigemi, Shirai, Masafumi
MgO-barrier magnetic tunnel junctions with half-metallic Heusler alloy electrodes attracted much attentions for spintronics applications. However, a couples of issues related to materials still remain to be resolved for practical uses. Recently, quar
Externí odkaz:
http://arxiv.org/abs/2010.04369
Autor:
Kunimatsu, Kazuma, Roy, Tufan, Okabayashi, Jun, Elphick, Kelvin, Tsuchiya, Tomoki, Ichinose, Tomohiro, Tsujikawa, Masahito, Hirohata, Atsufumi, Shirai, Masafumi, Mizukami, Shigemi
Co-rich Co$_{1-x}$Mn$_x$ alloys have hcp or fcc disordered phases and those ferromagnetic orderings are significantly deteriorated with increasing Mn concentration $x$ in bulk. On the other hand, those metastable bcc phases show properties attractive
Externí odkaz:
http://arxiv.org/abs/2010.03775
Autor:
Sadhukhan, Pampa, Barman, Sajal, Roy, Tufan, Singh, Vipin Kumar, Sarkar, Shuvam, Chakrabarti, Aparna, Barman, Sudipta Roy
Publikováno v:
Physical Review B 100, 235404 (2019)
The electronic structure of Au-Sn intermetallic layers of different compositions grown on Au(111) to the thickness of several nanometers has been studied in this work. The layer, interface and the substrate related components in the Au 4$f$ and Sn 4$
Externí odkaz:
http://arxiv.org/abs/1911.10002