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4 November 2016 Strain engineered magnetic tunnel junctions and spin-orbit torque switching (Conference Presentation)
Yang Wu, Kulothungasagaran Narayanapillai, Mehrdad Elyasi, Xuepeng Qiu, Hyunsoo Yang
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Proceedings Volume 9931, Spintronics IX; 99311Z (2016) https://doi.org/10.1117/12.2237128
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States
Abstract
The efficient generation of pure spin currents and manipulation of the magnetization dynamics of magnetic structures is of central importance in the field of spintronics. The spin-orbit effect is one of the promising ways to generate spin currents, in which a charge current can be converted to a transverse spin current due to the spin-orbit interaction. We investigate the spin dynamics in the presence of strong spin-orbit coupling materials such as LaAlO3/SrTiO3 oxide heterostructures. Angle dependent magnetoresistance measurements are employed to detect and understand the current-induced spin-orbit torques, and an effective field of 2.35 T is observed for a dc-current of 200 uA. In order to understand the interaction between light and spin currents, we use a femtosecond laser to excite an ultrafast transient spin current and subsequent terahertz (THz) emission in nonmagnet (NM)/ferromagnet (FM)/oxide heterostructures. The THz emission strongly relies on spin-orbit interaction, and is tailored by the magnitude and sign of the effective spin Hall angle of the NM. Our results can be utilized for ultrafast spintronic devices and tunable THz sources.
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Yang Wu, Kulothungasagaran Narayanapillai, Mehrdad Elyasi, Xuepeng Qiu, and Hyunsoo Yang "Strain engineered magnetic tunnel junctions and spin-orbit torque switching (Conference Presentation)", Proc. SPIE 9931, Spintronics IX, 99311Z (4 November 2016); https://doi.org/10.1117/12.2237128
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KEYWORDS
Magnetism
Terahertz radiation
Spintronics
Heterojunctions
Switching
Ultrafast phenomena
Femtosecond phenomena
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