Toward realizing a thermopile made of the chiral anti-ferromagnet Mn3Sn, focused ion beam (FIB) lithography was employed to microfabricate a thermoelectric element consisting of a Ta/Al2O3/Mn3Sn layered structure. In this device, the Ta layer acts as a heater producing Joule heat diffusing across the Al2O3 insulating layer into the thin Mn3Sn layer. The measured Nernst signal exhibits a clear hysteresis in an applied temperature gradient and magnetic field at 300 K, and its magnitude is proportional to the square of the electrical current applied to the Ta heater. The spontaneous, zero field voltage signal in the device is of the order of a few μV, which is almost the same order of magnitude as observed in the bulk single-crystal Mn3Sn under a temperature gradient. The anomalous Nernst coefficient SANE of the microfabricated element was determined using a temperature gradient simulated by finite-element modeling. The obtained value of is 0.27 μV/K, which is in good agreement with that of the reported experimental value of SANE (0.3 μV/K) for bulk single-crystal Mn3Sn. This result indicates that FIB microfabrication does not significantly alter the thermoelectric properties of bulk Mn3Sn. As the chiral antiferromagnet produces almost no stray field, our study opens the avenue for the fabrication of an efficient thermopile by densely packing the microfabricated antiferromagnetic elements.
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13 November 2017
Research Article|
November 13 2017
Anomalous Nernst effect in a microfabricated thermoelectric element made of chiral antiferromagnet Mn3Sn
Hideki Narita;
Hideki Narita
a)
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8681, Japan
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Muhammad Ikhlas;
Muhammad Ikhlas
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8681, Japan
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Motoi Kimata;
Motoi Kimata
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8681, Japan
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Agustinus Agung Nugroho
;
Agustinus Agung Nugroho
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8681, Japan
2
Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung
, Jl. Ganesha 10, Bandung, Indonesia
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Satoru Nakatsuji;
Satoru Nakatsuji
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8681, Japan
3
JST CREST
, K's Gobancho 6F 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan
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YoshiChika Otani
YoshiChika Otani
b)
1
Institute for Solid State Physics, University of Tokyo
, Kashiwa 277-8681, Japan
3
JST CREST
, K's Gobancho 6F 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan
4
Center for Emergent Matter Science
, RIKEN, Wako, Saitama 351-0198, Japan
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Appl. Phys. Lett. 111, 202404 (2017)
Article history
Received:
August 18 2017
Accepted:
October 25 2017
Citation
Hideki Narita, Muhammad Ikhlas, Motoi Kimata, Agustinus Agung Nugroho, Satoru Nakatsuji, YoshiChika Otani; Anomalous Nernst effect in a microfabricated thermoelectric element made of chiral antiferromagnet Mn3Sn. Appl. Phys. Lett. 13 November 2017; 111 (20): 202404. https://doi.org/10.1063/1.5000815
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