Kyushu University Academic Staff Educational and Research Activities Database
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Yuichiro Kurokawa Last modified date:2019.06.27





Homepage
http://mag.ed.kyushu-u.ac.jp/indexE.html
Academic Degree
Ph. D. in Engineering
Country of degree conferring institution (Overseas)
No
Field of Specialization
spintronics, nanotechnology
Research
Research Interests
  • Investigation of magnetic domain wall memory
    Investigation of spin logic

    keyword : spintronics
    2017.04.
Academic Activities
Papers
1. Yuichiro Kurokawa, Masakazu Wakae, Satoshi Sumi, Hiroyuki Awano, Kohei Ohnishi, Hiromi Yuasa, Spin-orbit torque-driven current-induced domain wall motion in Gd-Fe magnetic wires, Japanese Journal of Applied Physics, 10.7567/1347-4065/aafa91, 58, 3, 2019.03, We fabricated Gd-Fe/Ta/sub. and W/Gd-Fe/Ta/sub. perpendicular magnetized magnetic wires and investigated current-induced domain wall motion (CIDWM) in them. The propagation field of the Gd-Fe wires is low (∼3 mT), and the wires were found to have a low threshold current density (∼3.1 ×1010 A m-2) of CIDWM. The directions of the CIDWM in Gd-Fe/Ta and W/Gd-Fe/Ta wires are opposite to each other, indicating that the CIDWM in both wires is driven by spin-orbit torque because the spin Hall torque generated by the Ta underlayer and W cap layer oppose each other..
2. Masakazu Wakae, Yuichiro Kurokawa, Hiromi Yuasa, Observation of spin-orbit torque-induced magnetization switching in Gd-Fe perpendicular magnetized wire with in-plane exchange bias field, Japanese Journal of Applied Physics, 10.7567/1347-4065/aaf877, 58, 2019.01, We fabricated a Ta/Gd-Fe/Ta and a Ta/Gd-Fe/Ir22Mn78/Co90Fe10/Ta multilayered magnetic wire and investigated spin-orbit torque current-induced magnetization switching in these wires. Magnetization switching in the Ta/Gd-Fe/Ir22Mn78/Co90Fe10/Ta multilayered magnetic wire can be observed by an electric current even if the external in-plane magnetic field is not applied at all. Moreover, we successfully observed the periodical magnetization switching in the Ta/Gd-Fe/Ir22Mn78/Co90Fe10/Ta multilayered magnetic wire in zero magnetic field. This indicates that the present wire is a promising material to realize magnetic random access memory with low power consumption..
3. Yuichiro Kurokawa, Hiroyuki Awano, Multilayered current-induced domain wall motion in Pt/Tb-Co/Ta/Tb-Co/Pt magnetic wire, AIP ADVANCES, 10.1063/1.5017814, 8, 2, 2018.02, We fabricated a Pt (3 nm)/Tb0.28Co0.72 (4 nm)/Ta (4 nm)/Tb0.26Co0.74 (4 nm)/Pt
(3 nm) multilayered magnetic wire and investigated current-induced domain wall
motion within it.We found that the Hall resistance of the Pt/Tb-Co/Ta/Tb-Co/Pt wire
has four stable levels under a magnetic field of zero. Moreover, we observed that the
domain walls in both the upper and lower ferromagnetic layers are controlled by a
single current source. This indicates that Pt/Tb-Co/Ta/Tb-Co/Pt wire can be used in
multi-level magnetic wire memory..
4. Yuichiro Kurokawa, Akihiro Shibata, Hiroyuki Awano, Enhancement of spin orbit torques in a Tb-Co alloy magnetic wire by controlling its Tb composition, AIP ADVANCES, 10.1063/1.4974280, 7, 5, 2017.05.
5. Yuichiro Kurokawa, Ryogo Yoshimura, Satoshi Sumi, Hiroyuki Awano, Thermal reduction of the threshold current density for current-induced domain wall motion in Tb-Co magnetic alloy wire, AIP ADVANCES, 10.1063/1.4979727, 7, 3, 2017.03.
6. Yuichiro Kurokawa, Masaya Kawamoto, Hiroyuki Awano, Current-induced domain wall motion attributed to spin Hall effect and Dzyaloshinsky-Moriya interaction in Pt/GdFeCo (100 nm) magnetic wire, JAPANESE JOURNAL OF APPLIED PHYSICS, 10.7567/JJAP.55.07MC02, 55, 7, 2016.07.
Presentations
1. Yuichiro Kurokawa, Masakazu Wakae, Masahiro Itoh, Satoshi Sumi, Hiroyuki Awano, Kohei Ohnishi, Hiromi Yuasa, Investigation of Y-shaped magnetic wire logic device by current-induced domain wall motion, 第66回応用物理学会春季学術講演会, 2019.03.
2. Masakazu Wakae, Masahiro Itoh, Yuichiro Kurokawa, Kohei Ohnishi, Hiromi Yuasa, Observation of spin-orbit torque magnetization switching in Gd-Fe perpendicular magnetized wire with IrMn cap layer, 第66回応用物理学会春季学術講演会, 2019.03.
3. Yuichiro Kurokawa, Current-induced domain wall motion in rare-earth transition-metal alloy magnetic wire for future memory, CARN-OSAKA Annual Workshop 2018, 2018.12.
4. Yuichiro Kurokawa, Satoshi Sumi, Hiroyuki Awano, Hiromi Yuasa, Multilayered current-induced domain wall motion for high density magnetic memory, 9th Joint European Magnetic Symposia, 2018.09.
5. Masakazu Wakae, Yuichiro Kurokawa, Hiromi Yuasa, Observation of Spin-Orbit Torque Magnetization Switching in Gd-Fe Perpendicular Magnetized Wire without External Magnetic Field, 2018 International Conference on Solid State Devices and Materials, 2018.09.
6. Masakazu Wakae, Yuichiro Kurokawa, Hiromi Yuasa, Observation of spin-orbit torque magnetization switching in Gd-Fe perpendicular magnetized wire without external magnetic field, 第65回 応用物理学会 春季学術講演会, 2018.03.
7. Yuichiro Kurokawa, Masakazu Wakae, Ryogo Yoshimura, Hiroyasu Kondo, Satoshi Sumi, Hiroyuki Awano, Hiromi Yuasa, Investigation of current-induced domain wall motion in Gd-Fe wire with low domain wall propagation filed, 第65回 応用物理学会 春季学術講演会, 2018.03.
8. Yuichiro Kurokawa, Current-induced domain wall motion in rare-earth transition-metal alloy magnetic wire, SKKU and Kyushu university Joint Workshop, 2018.01.
Membership in Academic Society
  • The Magnetics Society of Japan
  • The Japan Society of Applied Physics
  • The Physical Society of Japan