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.
Highlights
In the case of magnetic wires without heavy metal layers, domain wall (DW) driving forces can be explained by spin transfer torques (STTs),[5] on the other hand, that in perpendicular magnetized wires with heavy metal layers can be explained by spin orbit torques (SOTs).[20]
In the case of the Current induced domain wall motion (CIDWM) induced by the spin hall effect (SHE) and Dzyaloshinskii-Moriya interaction (DMI), the DWs should be changed to chiral Neel walls under the DMI effective field (HDMI).[20]
We investigated the current-induced domain wall motion in Pt/TbxCo1-x alloy wires with various Tb compositions
Summary
Current induced domain wall motion (CIDWM) is a subject of great interests because of its potential applications such as new magnetic memories and logic.[1,2,3] A number of experimental investigations for the CIDWM have been carried out using magnetic wires.[4,5,6,7,8,9,10,11,12,13,14] Recently, the CIDWM in perpendicular magnetized wires with heavy metal layer has been reported.[15,16,17,18,19,20,21,22] In the case of magnetic wires without heavy metal layers, domain wall (DW) driving forces can be explained by spin transfer torques (STTs),[5] on the other hand, that in perpendicular magnetized wires with heavy metal layers can be explained by spin orbit torques (SOTs).[20]. We investigated the CIDWM by the SOTs in rare-earth transition-metal magnetic wires.[23,24,25,26] Recently, we reported that Tb/Co multilayered wires have low threshold current density (Jth) for the CIDWM and high DW velocity.[27] We suggested that this result is attributed to large SOTs generated by extrinsic SHE from the Tb-Co inner interfaces.[27] On the other hand, in contrast to the Tb/Co multilayered wires, the CIDWM in Tb-Co alloy has not been clarified. In this study, we investigated the CIDWM in amorphous Tb-Co alloy wires with various Tb compositions
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