期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201805822
关键词
Dzyaloshinskii-Moriya interaction; spin Hall conductivity; spin Hall effect; spin-orbit torque
类别
资金
- Office of Naval Research [N00014-15-1-2449]
- NSF MRSEC program through the Cornell Center for Materials Research [DMR-1719875]
- Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA) [W911NF-14-C0089]
- SHINES, an Energy Frontier Research Center - U.S. Department of Energy (DoE), Office of Science, Basic Energy Science (BES) [DE-SC0012670]
- NSF [ECCS-1542081]
Despite their great promise for providing a pathway for very efficient and fast manipulation of magnetization, spin-orbit torque (SOT) operations are currently energy inefficient due to a low damping-like SOT efficiency per unit current bias, and/or the very high resistivity of the spin Hall materials. This work reports an advantageous spin Hall material, Pd1-xPtx, which combines a low resistivity with a giant spin Hall effect as evidenced with three independent SOT ferromagnetic detectors. The optimal Pd0.25Pt0.75 alloy has a giant internal spin Hall ratio of >0.60 (damping-like SOT efficiency of approximate to 0.26 for all three ferromagnets) and a low resistivity of approximate to 57.5 mu Omega cm at a 4 nm thickness. Moreover, it is found that the Dzyaloshinskii-Moriya interaction (DMI), the key ingredient for the manipulation of chiral spin arrangements (e.g., magnetic skyrmions and chiral domain walls), is considerably strong at the Pd1-xPtx/Fe0.6Co0.2B0.2 interface when compared to that at Ta/Fe0.6Co0.2B0.2 or W/Fe0.6Co0.2B0.2 interfaces and can be tuned by a factor of 5 through control of the interfacial spin-orbital coupling via the heavy metal composition. This work establishes a very effective spin current generator that combines a notably high energy efficiency with a very strong and tunable DMI for advanced chiral spintronics and spin torque applications.
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