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It is crucial to realize field-free, deterministic, current-induced switchingin spin-orbit torque magnetic random-access memory (SOT-MRAM) withperpendicular magnetic anisotropy (PMA). A tentative solution has emergedrecently, which employs the interlayer chiral exchange coupling or theinterlayer Dzyaloshinskii-Moriya interaction (i-DMI) to achieve symmetrybreaking. We hereby investigate the interlayer DMI in a Pt/Co multilayer systemwith orthogonally magnetized layers, using repeatedly stacked [Pt/Co]nstructure with PMA, and a thick Co layer with in-plane magnetic anisotropy(IMA). We clarify the origin and the direction of such symmetry breaking withrelation to the i-DMI effective field, and show a decreasing trend of the saideffective field magnitude to the stacking number (n). By comparing thecurrent-induced field-free switching behavior for both PMA and IMA layers, weconfirm the dominating role of i-DMI in such field-free switching, excludingother possible mechanisms such as tilted-anisotropy and unconventional spincurrents that may have arisen from the symmetry breaking.

Field-Free Switching in Symmetry Breaking Multilayers: The Critical Role of Interlayer Chiral Exchange