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• W2893080818 endingPage "053011" @default.
• W2893080818 startingPage "053011" @default.
• W2893080818 abstract "Abstract We consider analytically current-driven dynamics of magnetic Néel walls in heavy metal/ferromagnetic metal/oxide trilayers where strong spin–orbit coupling and interfacial Dzyaloshinskii–Moriya interaction (i-DMI) coexist. We show that field-like spin–orbit torque (FL-SOT) with effective field along <?CDATA ${bf{n}}times hat{{bf{J}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi mathvariant=bold>n</mml:mi> <mml:mo>×</mml:mo> <mml:mover accent=true> <mml:mrow> <mml:mi mathvariant=bold>J</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>ˆ</mml:mo> </mml:mrow> </mml:mover> </mml:math> ( n being the interface normal and <?CDATA $hat{{bf{J}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mover accent=true> <mml:mrow> <mml:mi mathvariant=bold>J</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>ˆ</mml:mo> </mml:mrow> </mml:mover> </mml:math> being the charge current direction) and i-DMI induced torque can both lead to Walker breakdown suppression meanwhile leaving the wall mobility (velocity versus current density) unchanged. However, i-DMI itself can not induce the ‘universal absence of Walker breakdown’ (UAWB) while FL-SOT exceeding a certain threshold can. Finitely-enlarged Walker limits before UAWB are theoretically calculated and well explain existing data. In addition, change in wall mobility and even its sign-inversion can be understood only if the anti-damping-like SOT is appended. For Néel walls in ferromagnetic-metal layer with both perpendicular and in-plane anisotropies, we have calculated the respective modifications of wall mobility under the coexistence of spin-transfer torque, SOTs and i-DMI. Analytics shows that in trilayers with perpendicular anisotropy strong enough spin Hall angle and appropriate sign of i-DMI parameter can lead to sign-inversion in wall mobility even under small enough current density, while in those with in-plane anisotropy this only occurs for current density in a specific range." @default.
• W2893080818 created "2018-10-05" @default.
• W2893080818 creator A5013244136 @default.
• W2893080818 creator A5047203889 @default.
• W2893080818 creator A5074916338 @default.
• W2893080818 date "2019-05-01" @default.
• W2893080818 modified "2023-10-04" @default.
• W2893080818 title "Understanding current-driven dynamics of magnetic Néel walls in heavy metal/ferromagnetic metal/oxide trilayers" @default.
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• W2893080818 doi "https://doi.org/10.1088/1367-2630/ab1ba9" @default.
• W2893080818 hasPublicationYear "2019" @default.
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