Growth-dependent Interlayer Chiral Exchange and Field-free Switching

Abstract

Interfacial Dzyaloshinskii-Moriya interaction (DMI) has long been observed in normal metal/ferromagnetic multilayers, enabling the formation of chiral domain walls, skyrmions and other 2D antisymmetric spin textures confined within a single ferromagnetic layer, while more recent works on interlayer DMI reveal new pathways in realizing novel chiral 3D spin textures between two separate layers.Here, we report on interlayer DMI between two orthogonally magnetized ferromagnetic layers (CoFeB/Co) mediated by a Pt layer, and confirm the chiral nature of the observed effective field of up to 37 Oe through asymmetric hysteresis loops under in-plane field.We highlight the importance of growth-induced in-plane symmetry breaking, resulting in a sizable interlayer DMI and a universal characteristic vector through wedge deposition of the samples.We further perform deterministic current-driven magnetization switching in the perpendicularly magnetized Co layer utilizing solely the effective field from the interlayer DMI.These results demonstrate the potential of interlayer DMI in facilitating deterministic field-free switching in spin memory applications.

22 pages, 3 figures

References in corpus (1)

• Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature

Cited by in corpus (5)

• All-antiferromagnetic electrically controlled memory on silicon featuring large tunneling magnetoresistance
• Field-Free Switching in Symmetry Breaking Multilayers: The Critical Role of Interlayer Chiral Exchange
• Observation and formation mechanism of 360° domain wall rings in Synthetic Anti-Ferromagnets with interlayer chiral interactions
• Interlayer Dzyaloshinskii-Moriya interaction in synthetic ferrimagnets
• Antisymmetric interlayer exchange coupling spontaneously built in synthetic antiferromagnetic structure by film growth