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Spin-charge conversion in NiMnSb Heusler alloy films

Half-metallic Heusler alloys are attracting considerable attention because of their unique half-metallic band structures, which exhibit high spin polarization and yield huge magnetoresistance ratios. Besides serving as ferromagnetic electrodes, Heusler alloys also have the potential to host spin-cha...

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Autores principales: Wen, Zhenchao, Qiu, Zhiyong, Tölle, Sebastian, Gorini, Cosimo, Seki, Takeshi, Hou, Dazhi, Kubota, Takahide, Eckern, Ulrich, Saitoh, Eiji, Takanashi, Koki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6910839/
https://www.ncbi.nlm.nih.gov/pubmed/31853493
http://dx.doi.org/10.1126/sciadv.aaw9337
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author Wen, Zhenchao
Qiu, Zhiyong
Tölle, Sebastian
Gorini, Cosimo
Seki, Takeshi
Hou, Dazhi
Kubota, Takahide
Eckern, Ulrich
Saitoh, Eiji
Takanashi, Koki
author_facet Wen, Zhenchao
Qiu, Zhiyong
Tölle, Sebastian
Gorini, Cosimo
Seki, Takeshi
Hou, Dazhi
Kubota, Takahide
Eckern, Ulrich
Saitoh, Eiji
Takanashi, Koki
author_sort Wen, Zhenchao
collection PubMed
description Half-metallic Heusler alloys are attracting considerable attention because of their unique half-metallic band structures, which exhibit high spin polarization and yield huge magnetoresistance ratios. Besides serving as ferromagnetic electrodes, Heusler alloys also have the potential to host spin-charge conversion. Here, we report on the spin-charge conversion effect in the prototypical Heusler alloy NiMnSb. An unusual charge signal was observed with a sign change at low temperature, which can be manipulated by film thickness and ordering structure. It is found that the spin-charge conversion has two contributions. First, the interfacial contribution causes a negative voltage signal, which is almost constant versus temperature. The second contribution is temperature dependent because it is dominated by minority states due to thermally excited magnons in the bulk part of the film. This work provides a pathway for the manipulation of spin-charge conversion in ferromagnetic metals by interface-bulk engineering for spintronic devices.
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spelling pubmed-69108392019-12-18 Spin-charge conversion in NiMnSb Heusler alloy films Wen, Zhenchao Qiu, Zhiyong Tölle, Sebastian Gorini, Cosimo Seki, Takeshi Hou, Dazhi Kubota, Takahide Eckern, Ulrich Saitoh, Eiji Takanashi, Koki Sci Adv Research Articles Half-metallic Heusler alloys are attracting considerable attention because of their unique half-metallic band structures, which exhibit high spin polarization and yield huge magnetoresistance ratios. Besides serving as ferromagnetic electrodes, Heusler alloys also have the potential to host spin-charge conversion. Here, we report on the spin-charge conversion effect in the prototypical Heusler alloy NiMnSb. An unusual charge signal was observed with a sign change at low temperature, which can be manipulated by film thickness and ordering structure. It is found that the spin-charge conversion has two contributions. First, the interfacial contribution causes a negative voltage signal, which is almost constant versus temperature. The second contribution is temperature dependent because it is dominated by minority states due to thermally excited magnons in the bulk part of the film. This work provides a pathway for the manipulation of spin-charge conversion in ferromagnetic metals by interface-bulk engineering for spintronic devices. American Association for the Advancement of Science 2019-12-13 /pmc/articles/PMC6910839/ /pubmed/31853493 http://dx.doi.org/10.1126/sciadv.aaw9337 Text en Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Wen, Zhenchao
Qiu, Zhiyong
Tölle, Sebastian
Gorini, Cosimo
Seki, Takeshi
Hou, Dazhi
Kubota, Takahide
Eckern, Ulrich
Saitoh, Eiji
Takanashi, Koki
Spin-charge conversion in NiMnSb Heusler alloy films
title Spin-charge conversion in NiMnSb Heusler alloy films
title_full Spin-charge conversion in NiMnSb Heusler alloy films
title_fullStr Spin-charge conversion in NiMnSb Heusler alloy films
title_full_unstemmed Spin-charge conversion in NiMnSb Heusler alloy films
title_short Spin-charge conversion in NiMnSb Heusler alloy films
title_sort spin-charge conversion in nimnsb heusler alloy films
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6910839/
https://www.ncbi.nlm.nih.gov/pubmed/31853493
http://dx.doi.org/10.1126/sciadv.aaw9337
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