Size dependence of Peltier cooling in ferromagnet/Au nanopillars

作者：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

来源：Applied Physics Express, 2015, 8(8): 083002.

DOI：10.7567/APEX.8.083002

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 Co2MnSi and Co2FeSi (CFS) and conventional FM metals Fe and Co. We report an enhanced effective Peltier coefficient Pi(CPP) in resistance-current curves at small D (<120 nm). The maximum Pi(CPP) value of about 165 mV, found for the CFS/Au interface with D similar to 60 nm, is 24 times higher than the bulk Peltier coefficient Pi(bulk) (similar to 7mV) and corresponds to a high cooling power of 43.6 MW/cm(2).

• 出版日期2015-8