期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202112561
关键词
Dzyaloshinskii-Moriya interaction; ferrimagnets; field-free switching; spin-orbit torque; tilted magnetic anisotropy
类别
资金
- National Research Foundation of Korea [NRF-2020R1A2C2005932, NRF-2021M3H4A6A02045430, NRF-2021M3F3A2A01037663]
- National Research Foundation of Korea [2021M3H4A6A02045430] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study demonstrates a field-free spin-orbit torque (SOT) switching method for perpendicular magnetization and explores the possibility of controlling the tilted magnetic anisotropy in multilayers. This is of great significance for the development of spintronics memory and logic devices.
Efficient current-induced switching of perpendicular magnetization is an essential task in spintronics for realizing high-performance information processing and for storage device application. However, the spin-orbit torque (SOT) by injection of in-plane polarized spins cannot deterministically switch the magnetization of ferromagnetic thin films with perpendicular magnetic anisotropy (PMA) without an additionally applied in-plane external magnetic field to break the symmetry of the PMA. Considering the difficulties of applying the magnetic field to the localized area only within a device structure, it is essential to contrive a facile field-free SOT switching mechanism. Here, deterministic field-free SOT switching of perpendicular magnetization is achieved in amorphous and ferrimagnetic Gd/Co multilayers accompanied by a tilted magnetic anisotropy axis. This tilted anisotropy originates from the combined contributions of many internal anisotropies in different orientations from the multilayers and is shown to be controllable. It is expected that the introduction of controlled tilted anisotropy into Gd/Co multilayers over the entire film surface in the present study can be extended to the development of wafer-scale technologies for the spintronics memory and logic devices.
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