Zobrazeno 1 - 10
of 250
pro vyhledávání: '"Shirai, Masafumi"'
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:
Tsuchiya, Tomoki, Roy, Tufan, Elphick, Kelvin, Okabayashi, Jun, Bainsla, Lakhan, Ichinose, Tomohiro, Suzuki, Kazuya, Tsujikawa, Masahito, Shirai, Masafumi, Hirohata, Atsufumi, Mizukami, Shigemi
Publikováno v:
Phys. Rev. Materials 3, 084403 (2019)
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 fabricating a junction device. This paper reports a fully epitaxial (001)-o
Externí odkaz:
http://arxiv.org/abs/1905.04070