Spin-orbit-coupling induced torque in ballistic domain walls: Equivalence of charge-pumping and nonequilibrium magnetization formalisms

Z. Yuan, Paul J. Kelly

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)
90 Downloads (Pure)

Abstract

To study the effect of spin-orbit coupling (SOC) on spin-transfer torque in magnetic materials, we have implemented two theoretical formalisms that can accommodate SOC. Using the “charge-pumping” formalism, we find two contributions to the out-of-plane spin-transfer torque parameter β in ballistic Ni domain walls (DWs). For short DWs, the nonadiabatic reflection of conduction electrons caused by the rapid spatial variation of the exchange potential results in an out-of-plane torque that increases rapidly with decreasing DW length. For long DWs, the Fermi level conduction channel anisotropy that gives rise to an intrinsic DW resistance in the presence of SOC leads to a linear dependence of β on the DW length. To understand this counterintuitive divergence of β in the long DW limit, we use the “nonequilibrium magnetization” formalism to examine the spatially resolved spin-transfer torque. The SOC-induced out-of-plane torque in ballistic DWs is found to be quantitatively consistent with the values obtained using the charge-pumping calculations, indicating the equivalence of the two theoretical methods.
Original languageEnglish
Pages (from-to)224415/1-224415/13
Number of pages13
JournalPhysical review B: Condensed matter and materials physics
Volume93
DOIs
Publication statusPublished - 2016

Keywords

  • IR-101166
  • METIS-317034

Fingerprint Dive into the research topics of 'Spin-orbit-coupling induced torque in ballistic domain walls: Equivalence of charge-pumping and nonequilibrium magnetization formalisms'. Together they form a unique fingerprint.

Cite this