Abstract
We demonstrate that spin transfer torque nano-oscillators (STNO) can act as wireless sensors for local current. The STNO acts as a transducer that converts weak direct currents into microwave field oscillations that we detect using an inductive coil. We detect direct currents in the range of 300–700 μA and report them wirelessly to a receiving induction coil at distances exceeding 6.5 mm. This current sensor could find application in chemical and biological sensing and industrial inspection.
We thank Dr. John Rodgers and Bisrat Adissie for providing access to the microwave equipment. We thank Juergen Langer and Berthold Ocker for magnetic multilayer deposition. We also gratefully acknowledge support from a NSF BRAIN EAGER grant (Grant No. DBI1450921) as part of the BRAIN initiative. The work of Yu-Jin Chen and Ilya Krivorotov on sample design and characterization was supported as part of the SHINES, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. # SC0012670.
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