High-power coherent microwave emission from magnetic tunnel junction nano-oscillators with perpendicular anisotropy

Zhongming Zeng*, Pedram Khalili Amiri, Ilya N. Krivorotov, Hui Zhao, Giovanni Finocchio, Jian Ping Wang, Jordan A. Katine, Yiming Huai, Juergen Langer, Kosmas Galatsis, Kang L. Wang, Hongwen Jiang

*Corresponding author for this work

Research output: Contribution to journalArticle

97 Scopus citations

Abstract

The excitation of the steady-state precessions of magnetization opens a new way for nanoscale microwave oscillators by exploiting the transfer of spin angular momentum from a spin-polarized current to a ferromagnet, referred to as spin-transfer nano-oscillators (STNOs). For STNOs to be practical, however, their relatively low output power and their relatively large line width must be improved. Here we demonstrate that microwave signals with maximum measured power of 0.28 μW and simultaneously narrow line width of 25 MHz can be generated from CoFeB-MgO-based magnetic tunnel junctions having an in-plane magnetized reference layer and a free layer with strong perpendicular anisotropy. Moreover, the generation efficiency is substantially higher than previously reported STNOs. The results will be of importance for the design of nanoscale alternatives to traditional silicon oscillators used in radio frequency integrated circuits.

Original languageEnglish (US)
Pages (from-to)6115-6121
Number of pages7
JournalACS nano
Volume6
Issue number7
DOIs
StatePublished - Jul 24 2012

Keywords

  • magnetic tunnel junction
  • magnetoresistance
  • microwave
  • perpendicular anisotropy
  • spin-transfer nano-oscillators

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Zeng, Z., Amiri, P. K., Krivorotov, I. N., Zhao, H., Finocchio, G., Wang, J. P., Katine, J. A., Huai, Y., Langer, J., Galatsis, K., Wang, K. L., & Jiang, H. (2012). High-power coherent microwave emission from magnetic tunnel junction nano-oscillators with perpendicular anisotropy. ACS nano, 6(7), 6115-6121. https://doi.org/10.1021/nn301222v