Ultralow-current-density and bias-field-free spin-transfer nano-oscillator

Zhongming Zeng*, Giovanni Finocchio, Baoshun Zhang, Pedram Khalili Amiri, Jordan A. Katine, Ilya N. Krivorotov, Yiming Huai, Juergen Langer, Bruno Azzerboni, Kang L. Wang, Hongwen Jiang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

149 Scopus citations


The spin-transfer nano-oscillator (STNO) offers the possibility of using the transfer of spin angular momentum via spin-polarized currents to generate microwave signals. However, at present STNO microwave emission mainly relies on both large drive currents and external magnetic fields. These issues hinder the implementation of STNOs for practical applications in terms of power dissipation and size. Here, we report microwave measurements on STNOs built with MgO-based magnetic tunnel junctions having a planar polarizer and a perpendicular free layer, where microwave emission with large output power, excited at ultralow current densities, and in the absence of any bias magnetic fields is observed. The measured critical current density is over one order of magnitude smaller than previously reported. These results suggest the possibility of improved integration of STNOs with complementary metal-oxide-semiconductor technology, and could represent a new route for the development of the next-generation of on-chip oscillators.

Original languageEnglish (US)
Article number1426
JournalScientific reports
StatePublished - 2013

ASJC Scopus subject areas

  • General


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