2014年1月
Highly sensitive nanoscale spin-torque diode
NATURE MATERIALS
- 巻
- 13
- 号
- 1
- 開始ページ
- 50
- 終了ページ
- 56
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/NMAT3778
- 出版者・発行元
- NATURE PUBLISHING GROUP
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 (1.4mVmW(-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 12,000mVmW(-1) is achievable at room temperature, exceeding that of semiconductor diode detectors (3,800mVmW(-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.
- リンク情報
- ID情報
-
- DOI : 10.1038/NMAT3778
- ISSN : 1476-1122
- eISSN : 1476-4660
- Web of Science ID : WOS:000328942800018