Size dependence of Peltier cooling in ferromagnet/Au nanopillars. (9th July 2015)

• Record Type: Journal Article
• Authors: Bosu, Subrojati; Sakuraba, Yuya; Kubota, Takahide; Juarez-Acosta, Isaac; Sugiyama, Tomoko; Saito, Kesami; Olivares-Robles, Miguel A.; Takahashi, Saburo; Bauer, Gerrit E. W.; Takanashi, Koki
• Is Part Of: Applied physics express. Volume 8:Number 8(2015:Aug.)
• Publication Date: 2015-07-09
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.8.083002
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We study Peltier cooling in current-perpendicular-to-plane multilayer nanopillars with diameters D varying from 60 to 430 nm and made from Au and various ferromagnets (FMs): Heusler compounds Co2 MnSi and Co2 FeSi (CFS) and conventional FM metals Fe and Co. We report an enhanced effective Peltier coefficient Π CPP in resistance–current curves at small D (<120 nm). The maximum Π CPP value of about 165 mV, found for the CFS/Au interface with D ∼ 60 nm, is 24 times higher than the bulk Peltier coefficient Π bulk (∼7 mV) and corresponds to a high cooling power of 43.6 MW/cm 2 .