2 research outputs found
Tailoring of the Interfacial Dzyaloshinskii–Moriya Interaction in Perpendicularly Magnetized Epitaxial Multilayers by Crystal Engineering
The interplay between the interfacial crystalline structure
and
Dzyaloshinskii–Moriya interaction (DMI) was investigated by
Fe insertion in epitaxial Pt/Co/Ir perpendicular magnetized multilayers.
The experimental results with the support of first-principles calculation
indicate that the Fe/Ir interface exhibits a positive interfacial
DMI (iDMI) originating from the fcc crystalline structure inserted
by 2 monolayers (ML) Fe, while a negative one from the structure with
a layer shifting of 1-ML Fe insertion. The total iDMI of the multilayers
increases (decreases) due to the additive enhancement (competitive
counteraction) between the iDMI of Fe/Ir and Pt/Co interfaces. Comparing
the iDMI of single-crystalline and textured multilayers, the iDMI
of multilayers is found to be particularly sensitive to the crystallinity
nearby the heterointerfaces. This work is of vital importance to reveal
a deeper insight into the physical mechanism of the iDMI and provides
a viable strategy for tailoring the iDMI of the multilayers by crystal
engineering
Controllable Spin–Orbit Torque Induced by Interfacial Ion Absorption in Ta/CoFeB/MgO Multilayers with Canted Magnetizations
Electrically generated spin–orbit torque (SOT)
has emerged
as a powerful pathway to control magnetization for spintronic applications
including memory, logic, and neurocomputing. However, the requirement
of external magnetic fields, together with the ultrahigh current density,
is the main obstacle for practical SOT devices. In this paper, we
report that the field-free SOT-driven magnetization switching can
be successfully realized by interfacial ion absorption in perpendicular
Ta/CoFeB/MgO multilayers. Besides, the tunable SOT efficiency exhibits
a strong dependence on interfacial Ti insertion thicknesses. Polarized
neutron reflection measurements demonstrate the existence of canted
magnetization with Ti inserted, which leads to deterministic magnetization
switching. In addition, interfacial characterization and first-principles
calculations reveal that B absorption by the Ti layer is the main
cause behind the enhanced interfacial transparency, which determines
the tunable SOT efficiency. Our findings highlight an attractive scheme
to a purely electric control spin configuration, enabling innovative
designs for SOT-based spintronics via interfacial engineering