CuPt Alloy Thin Films for Application in Spin Thermoelectrics.

Abstract:

:Spin thermoelectrics represents a new paradigm of thermoelectricity that has a potential to overcome the fundamental limitation posed by the Wiedmann-Franz law on the efficiency of conventional thermoelectric devices. A typical spin thermoelectric device consists of a bilayer of a magnetic insulator and a high spin-orbit coupling (SOC) metal coated over a non-magnetic substrate. Pt is the most commonly used metal in spin thermoelectric devices due to its strong SOC. In this paper, we found that an alloy of Cu and Pt can perform much better than Pt in spin thermoelectric devices. A series of CuPt alloy films with different Pt concentrations were deposited on yttrium iron garnet (YIG) films coated gadolinium gallium garnet (GGG) substrate. Through spin Seebeck measurements, it was found that the Cu0.4Pt0.6/YIG/GGG device shows almost 3 times higher spin Seebeck voltage compared to Pt/YIG/GGG under identical conditions. The improved performance was attributed to the higher resistivity as well as enhanced spin hall angle of the CuPt layer.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Tian K,Tiwari A

doi

10.1038/s41598-019-40021-x

subject

Has Abstract

pub_date

2019-02-28 00:00:00

pages

3133

issue

1

issn

2045-2322

pii

10.1038/s41598-019-40021-x

journal_volume

9

pub_type

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