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Magnetic droplet nucleation with a homochiral Néel domain wall
Kim, Sanghoon,Jang, Peong-Hwa,Kim, Duck-Ho,Ishibashi, Mio,Taniguchi, Takuya,Moriyama, Takahiro,Kim, Kab-Jin,Lee, Kyung-Jin,Ono, Teruo American Physical Society 2017 Physical Review B Vol.95 No.22
<P>We investigate the effect of the Dzyaloshinskii-Moriya interaction (DMI) on magnetic domain nucleation in a ferromagnetic thin film with perpendicular magnetic anisotropy. We propose an extended droplet model to determine the nucleation field as a function of the in-plane field. The model can explain the experimentally observed nucleation in a Co/Ni microstrip with an interfacial DMI. The results are also reproduced by micromagnetic simulation based on the string model. The electrical measurement method proposed here can be widely used to quantitatively determine the DMI energy density.</P>
Temperature dependence of spin Hall magnetoresistance in W/CoFeB bilayer
Okuno, Takaya,Taniguchi, Takuya,Kim, Sanghoon,Baek, Seung-heon Chris,Park, Byong-Guk,Moriyama, Takahiro,Kim, Kab-Jin,Ono, Teruo Institute of Pure and Applied Physics 2016 Japanese Journal of Applied Physics Vol. No.
<P>We investigate the temperature dependence of the spin Hall magnetoresistance (SMR) in a W/CoFeB bilayer. The SMR is found to increase with decreasing temperature. An analysis based on the SMR theory suggests that the spin Hall angle of W and/or the spin polarization of CoFeB can be the origin of the temperature dependence of the SMR. We also find that the spin diffusion length and the resistivity of W do not significantly vary with temperature, which indicates the necessity of further study on the electron transport mechanism in W films to reveal the origin of the spin Hall effect in W. (C) 2016 The Japan Society of Applied Physics</P>
Origin of threshold current density for asymmetric magnetoresistance in Pt/Py bilayers
Li, Tian,Kim, Sanghoon,Lee, Seung-Jae,Lee, Seo-Won,Koyama, Tomohiro,Chiba, Daichi,Moriyama, Takahiro,Lee, Kyung-Jin,Kim, Kab-Jin,Ono, Teruo JAPAN SOCIETY OF APPLIED PHYSICS 2017 Applied physics express Vol.10 No.7
<P>The asymmetric magnetoresistance (MR) in Py/Pt bilayers is investigated. It increases linearly with respect to the current density up to a threshold and increases more rapidly above this threshold. To reveal the origin of the threshold behavior, we investigate the magnetic field dependence of the asymmetric MR. It is found that the magnetic field strongly suppresses the asymmetric MR only above the threshold current density. Micromagnetic simulation reveals that the reduction of magnetization due to the spin-torque oscillation can be the origin of the threshold behavior of the asymmetric MR. (C) 2017 The Japan Society of Applied Physics</P>
Low Magnetic Damping of Ferrimagnetic GdFeCo Alloys
Kim, Duck-Ho,Okuno, Takaya,Kim, Se Kwon,Oh, Se-Hyeok,Nishimura, Tomoe,Hirata, Yuushou,Futakawa, Yasuhiro,Yoshikawa, Hiroki,Tsukamoto, Arata,Tserkovnyak, Yaroslav,Shiota, Yoichi,Moriyama, Takahiro,Kim, American Physical Society 2019 Physical Review Letters Vol.122 No.12