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2,062 results on '"Miwa, S"'

217. Highly sensitive nanoscale spin-torque diode.

Author

Miwa, S., Ishibashi, S., Tomita, H., Nozaki, T., Tamura, E., Ando, K., Mizuochi, N., Saruya, T., Kubota, H., Yakushiji, K., Taniguchi, T., Imamura, H., Fukushima, A., Yuasa, S., and Suzuki, Y.

Subjects
*MICROWAVE devices, *TELECOMMUNICATION, *COLD (Temperature), *SEMICONDUCTOR devices, *FERROMAGNETIC resonance, *SEMICONDUCTOR diodes
Abstract

Highly sensitive microwave devices that are operational at room temperature are important for high-speed multiplex telecommunications. Quantum devices such as superconducting bolometers possess high performance but work only at low temperature. On the other hand, semiconductor devices, although enabling high-speed operation at room temperature, have poor signal-to-noise ratios. In this regard, the demonstration of a diode based on spin-torque-induced ferromagnetic resonance between nanomagnets represented a promising development, even though the rectification output was too small for applications (1.4 mV mW−1). Here we show that by applying d.c. bias currents to nanomagnets while precisely controlling their magnetization-potential profiles, a much greater radiofrequency detection sensitivity of 12,000 mV mW−1 is achievable at room temperature, exceeding that of semiconductor diode detectors (3,800 mV mW−1). Theoretical analysis reveals essential roles for nonlinear ferromagnetic resonance, which enhances the signal-to-noise ratio even at room temperature as the size of the magnets decreases. [ABSTRACT FROM AUTHOR]

Published
2014
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232. Heterovalent ZnSe/GaAs Interfaces

Author

Yao, T., primary, Lu, F., additional, Cho, M.W., additional, Koh, K.W., additional, Zhu, Z., additional, Kuo, L.H., additional, Yasuda, T., additional, Ohtake, A., additional, Miwa, S., additional, Kimura, K., additional, and Nakajima, K., additional

Published
1997
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