Spin-orbit torque from a platinum strip actuates magnetostrictive nanomagnets on a piezoelectric substrate, generating a surface acoustic wave that the authors claim exceeds the sub-wavelength antenna efficiency limit by about 50 times.
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Experimental Demonstration of an Extreme Sub-Wavelength Nanomagnetic Acoustic Antenna Actuated by Spin-Orbit Torque from a Heavy Metal Nanostrip
Spin-orbit torque from a platinum strip actuates magnetostrictive nanomagnets on a piezoelectric substrate, generating a surface acoustic wave that the authors claim exceeds the sub-wavelength antenna efficiency limit by about 50 times.