Strong temperature-dependent thermoelectric power of IrMn3 thin films of different thicknesses

IrMn3 thin films were experimentally characterized by thermoelectric power and resistivity as a function of temperature and sample thickness. The Seebeck coefficient shows strong temperature dependence and the value increases with temperature up to 350 K. An empirical Boltzmann sigmoid function can...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2020-10, Vol.54 (1)
Main Authors: Hu, Junfeng, Kothari, Mukund Krishna, Eimer, Sylvain, Zhao, Weisheng, Yu, Haiming, Ansermet, Jean-Philippe
Format: Article
Language:English
Subjects:
antiferromagnet
Boltzmann sigmoid function
thermoelectric power
transition
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Summary:IrMn3 thin films were experimentally characterized by thermoelectric power and resistivity as a function of temperature and sample thickness. The Seebeck coefficient shows strong temperature dependence and the value increases with temperature up to 350 K. An empirical Boltzmann sigmoid function can fit our data remarkably well. The temperature-dependent resistivity shows a similar behavior as the thermoelectric power, i.e. both these two properties exhibit a transitional behavior at some critical temperature range, which is further confirmed by the magnetic susceptibility measurements.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/abbbb8