Enhancement of spin orbit torques in a Tb-Co alloy magnetic wire by controlling its Tb composition

Yuichiro Kurokawa; Akihiro Shibata; Hiroyuki Awano

doi:10.1063/1.4974280

Enhancement of spin orbit torques in a Tb-Co alloy magnetic wire by controlling its Tb composition

Yuichiro Kurokawa, Akihiro Shibata, Hiroyuki Awano

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

We investigated the current-induced domain wall motion (CIDWM) in Pt(3 nm)/Tb_xCo_1-x(6 nm) alloy wires with various Tb composition (x). We found that the threshold current density (J_th) for the CIDWM in the Tb_xCo_1-x alloy wires decreases with increasing x. In particular, the J_th with x = 0.37 is almost 3 times smaller than that with x = 0.23. We estimated Dzyaloshinskii-Moriya interaction (DMI) effective field (H_DMI) by measuring CIDWM in a longitudinal magnetic field. We found that DMI constant (D) estimated by the H_DMI also strongly depends on x. The size of the DMI may be modified by changing electronegativity or local atomic arrangement in Tb-Co alloy. These results suggest that Tb can induce strong H_DMI and effectively affect CIDWM in Tb_xCo_1-x alloy wires.

Original language	English
Article number	055917
Journal	AIP Advances
Volume	7
Issue number	5
DOIs	https://doi.org/10.1063/1.4974280
Publication status	Published - May 1 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.4974280

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title = "Enhancement of spin orbit torques in a Tb-Co alloy magnetic wire by controlling its Tb composition",

abstract = "We investigated the current-induced domain wall motion (CIDWM) in Pt(3 nm)/TbxCo1-x(6 nm) alloy wires with various Tb composition (x). We found that the threshold current density (Jth) for the CIDWM in the TbxCo1-x alloy wires decreases with increasing x. In particular, the Jth with x = 0.37 is almost 3 times smaller than that with x = 0.23. We estimated Dzyaloshinskii-Moriya interaction (DMI) effective field (HDMI) by measuring CIDWM in a longitudinal magnetic field. We found that DMI constant (D) estimated by the HDMI also strongly depends on x. The size of the DMI may be modified by changing electronegativity or local atomic arrangement in Tb-Co alloy. These results suggest that Tb can induce strong HDMI and effectively affect CIDWM in TbxCo1-x alloy wires.",

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AU - Kurokawa, Yuichiro

AU - Shibata, Akihiro

AU - Awano, Hiroyuki

PY - 2017/5/1

Y1 - 2017/5/1

N2 - We investigated the current-induced domain wall motion (CIDWM) in Pt(3 nm)/TbxCo1-x(6 nm) alloy wires with various Tb composition (x). We found that the threshold current density (Jth) for the CIDWM in the TbxCo1-x alloy wires decreases with increasing x. In particular, the Jth with x = 0.37 is almost 3 times smaller than that with x = 0.23. We estimated Dzyaloshinskii-Moriya interaction (DMI) effective field (HDMI) by measuring CIDWM in a longitudinal magnetic field. We found that DMI constant (D) estimated by the HDMI also strongly depends on x. The size of the DMI may be modified by changing electronegativity or local atomic arrangement in Tb-Co alloy. These results suggest that Tb can induce strong HDMI and effectively affect CIDWM in TbxCo1-x alloy wires.

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Enhancement of spin orbit torques in a Tb-Co alloy magnetic wire by controlling its Tb composition

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