Enhanced Broad-band Radio Frequency Detection in Nanoscale Magnetic Tunnel Junction by Interface Engineering

Like Zhang, Bin Fang, Jialin Cai, Weican Wu, Baoshun Zhang, Bochong Wang, Pedram Khalili Amiri, Giovanni Finocchio, Zhongming Zeng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Broad-band radio frequency (RF) detection is of great interest for its potential applications in wireless charging and energy harvesting. Here, we demonstrate that the bandwidth of broad-band RF detection in spin-torque diodes based on magnetic tunnel junctions (MTJs) can be enhanced through engineering the interface perpendicular magnetic anisotropy (PMA) between the CoFeB free layer and the MgO tunnel barrier. An ultrawide RF detection bandwidth of over 3 GHz is observed in the MTJs, and the broad-band RF detection behavior can be modulated by tuning the free layer PMA. Furthermore, a wide RF detection bandwidth (about 1.8 GHz) can be realized even without any external bias field for free layers with a thickness of about 1.65 nm. Finally, the dependence of the broad-band RF detection bandwidth on external magnetic field and RF power is discussed. Our results pave the way for RF energy harvesting for future portable nanoelectronics.

Original languageEnglish (US)
Pages (from-to)29382-29387
Number of pages6
JournalACS Applied Materials and Interfaces
Volume11
Issue number32
DOIs
StatePublished - Aug 14 2019

Keywords

  • broad-band detection
  • energy harvesting
  • magnetic tunnel junction
  • perpendicular magnetic anisotropy
  • radio frequency detection
  • spin-torque diode

ASJC Scopus subject areas

  • Materials Science(all)

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