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4 October 2022 Enhancing spin-orbit torque efficiency via orbital currents (Conference Presentation)
Chen-Yu Hu, Yu-Fang Chiu, Chia-Chin Tsai, Chao-Chun Huang, Kuan-Hao Chen, Cheng-Wei Peng, Chien-Min Lee, Ming-Yuan Song, Yen-Lin Huang, Shy-Jay Lin, Chi-Feng Pai
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Proceedings Volume PC12205, Spintronics XV; PC1220518 (2022) https://doi.org/10.1117/12.2634506
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
5d transition metal Pt is one of the classical spin Hall materials for efficient generation of spin-orbit torques (SOTs) in Pt/ferromagnetic layer (FM) heterostructures. However, for a long while with tremendous engineering endeavors, the damping-like SOT efficiencies (ξDL) of Pt and Pt alloys are still limited to ξDL<0.5. Here we present that with proper alloying elements, particularly 3d transition metals V and Cr, the strength of the high spin Hall conductivity of Pt (σSH∼6.45×105(ℏ/2e)Ω−1⋅m−1) can be developed. Especially for the Cr-doped case, an extremely high ξDL∼0.9 in a Pt0.69Cr0.31/Co device can be achieved with a moderate Pt0.69Cr0.31 resistivity of ρxx∼133μΩ⋅cm. A low critical SOT-driven switching current density of Jc∼3.16×106A⋅cm−2 is also demonstrated. The damping constant (α) of Pt0.69Cr0.31/FM structure is also found to be reduced to 0.052 from the pure Pt/FM case of 0.078. The overall high σSH, giant ξDL, moderate ρxx, and reduced α of such Pt-Cr/FM heterostructure makes it promising for versatile extremely low power consumption SOT memory applications.
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Chen-Yu Hu, Yu-Fang Chiu, Chia-Chin Tsai, Chao-Chun Huang, Kuan-Hao Chen, Cheng-Wei Peng, Chien-Min Lee, Ming-Yuan Song, Yen-Lin Huang, Shy-Jay Lin, and Chi-Feng Pai "Enhancing spin-orbit torque efficiency via orbital currents (Conference Presentation)", Proc. SPIE PC12205, Spintronics XV, PC1220518 (4 October 2022); https://doi.org/10.1117/12.2634506
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KEYWORDS
Chromium
Magnetism
Heterojunctions
Metals
Platinum
Transition metals
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