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Park, Je Wook
원자제어 저차원 전자계 연구단
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Spin-Dependent Thermoelectric Power of Nanoislands

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Title
Spin-Dependent Thermoelectric Power of Nanoislands
Author(s)
Jewook Park; Felix Lüpke; Jun Jiang; Xiao-Guang Zhang; An-Ping Li
Subject
nanomagnetism, ; Scanning tunneling thermovoltage microscopy (STVthM), ; Seebeck coefficient, ; spin-polarized scanning tunneling microscopy, ; surface magnetism, ; thermovoltage
Publication Date
2020-07
Journal
NANO LETTERS, v.20, no.7, pp.4910 - 4915
Publisher
AMER CHEMICAL SOC
Abstract
© 2020 American Chemical Society.The Seebeck effect explains the generation of electric voltage as a result of a temperature gradient. Its efficiency, defined as the ratio of the generated electric voltage to the temperature difference, is sensitive to local inhomogeneities that alter the scattering rate and the density of the conduction electrons. Spin-polarized Seebeck tunneling generates a distinct thermovoltage in spin-up and spin-down charge transport channels, which, as a key to spin caloritronics, focuses on transport phenomena related to spin and heat. Here, we report spatially resolved measurement of the spin-dependent thermovoltage in a tunneling junction formed by ferromagnetic Co nanoislands and a Ni tip using spin-dependent scanning tunneling thermovoltage microscopy (SP-STVthM). We resolve the nanoscale thermoelectric powers with respect to spin polarization, nanoisland size, stacking order of Co layers on a Cu substrate, and local sample heterogeneities. The observed thermally generated spin voltages are supported by first-principles and model calculations
URI
https://pr.ibs.re.kr/handle/8788114/7761
DOI
10.1021/acs.nanolett.0c00972
ISSN
1530-6984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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