Enhancement of charge-to-spin current conversion in a Ni/Pt bilayer film detected by spin Peltier effect. (16th April 2020)

• Record Type: Journal Article
• Authors: Yamazaki, Takumi; Iguchi, Ryo; Nagano, Hosei; Uchida, Ken-ichi
• Is Part Of: Japanese journal of applied physics. Volume 59:Number 5(2020)
• Publication Date: 2020-04-16
• Subjects: spin current -- spin Peltier effect -- spin Hall effect -- Rashba–Edelstein effect -- interface -- lock-in thermography; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ab8025
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: We demonstrate the enhancement of charge-to-spin current conversion by a ferromagnet/paramagnet interface. The enhancement is confirmed by comparing the spin Peltier effect (SPE) between Ni/Pt/yttrium-iron-garnet (YIG) and Pt/YIG hybrid structures, where the SPE signal is proportional to the spin current generated in the Ni/Pt or Pt layer. The SPE signal normalized by charge current density for the Ni/Pt/YIG system increases by 65% compared to the Pt/YIG system, which cannot be explained by other thermoelectric and thermo-spin effects. This result suggests the presence of additive charge-to-spin current conversion at the Ni/Pt interface, providing simple ways to improve spin-injection efficiency.