Observation of a thermally enhanced magnetoresistance in NiFe

Y. Cao; C. Feng; D. X. Liu; L. J. Wang; G. Yang; J. Y. Zhang; B. Zhao; S. L. Jiang; Q. Q. Liu; K. Yang; A. B. Zelalem; G. H. Yu

doi:10.1063/1.4948310

AIP Advances (Apr 2016)

Observation of a thermally enhanced magnetoresistance in NiFe

Y. Cao,
C. Feng,
D. X. Liu,
L. J. Wang,
G. Yang,
J. Y. Zhang,
B. Zhao,
S. L. Jiang,
Q. Q. Liu,
K. Yang,
A. B. Zelalem,
G. H. Yu

Affiliations

Y. Cao: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
C. Feng: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
D. X. Liu: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
L. J. Wang: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
G. Yang: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
J. Y. Zhang: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
B. Zhao: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
S. L. Jiang: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
Q. Q. Liu: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
K. Yang: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
A. B. Zelalem: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
G. H. Yu: Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China

DOI: https://doi.org/10.1063/1.4948310
Journal volume & issue: Vol. 6, no. 4
pp. 045314 – 045314-5

Abstract

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A thermally enhanced magnetoresistance (ThMR) was designed and obtained by simultaneously applying charge and heat currents to a NiFe thin film. From the measurement we observed that the magnetoresistance value was as high as -22600% when the input charge current and applied temperature gradient was 0.966 μA and 2.5 °C/mm, respectively. This ThMR can be controllable by adjusting the relative values of the input charge and heat currents. On increasing the input charge current from 0.85 to 1.05 μA by fixing the temperature gradient at 2.5 °C/mm, the ThMR first increased from 9% to 183% and then decreased from -259% to -13%, at intervals of ∼0.96 μA. This can be explained by the spin-dependent transport phenomenon i.e., scattering induced sign difference between magnetoresistance and magnetothermopower in NiFe.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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