Spin-Torque Manipulation for Hydrogen Sensing

Hongyu An, Satoshi Haku, Yuito Kageyama, Akira Musha, Yuya Tazaki, Kazuya Ando

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


External manipulation of spin-orbit torques (SOTs) promises not only energy-efficient spin-orbitronic devices but also versatile applications of spin-based technologies in diverse fields. However, the external electric-field control, widely used in semiconductor spintronics, is known to be ineffective in conventional metallic spin-orbitronic devices due to the very short screening length. Here, an alternative approach to control the SOTs by using gases is shown. It is demonstrated that the spin-torque generation efficiency of a Pd/Ni81Fe19 bilayer can be reversibly manipulated by the absorption and desorption of H2 gas, which appears concomitantly with the change of the electrical resistance. It is found that compared with the change of the Pd resistance induced by the H2 absorption, the change of the spin-torque generation efficiency is almost an order of magnitude larger. This result provides a new method to externally manipulate the SOTs and paves a way for developing more sensitive hydrogen sensors based on the spin-orbitronic technology.

Original languageEnglish
Article number2002897
JournalAdvanced Functional Materials
Issue number30
Publication statusPublished - 2020 Jul 1


  • hydrogen sensing
  • spin-orbit torque
  • spin-orbitronics
  • spin-torque ferromagnetic resonance

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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