Efficient thermal spin injection using CoFeAl nanowires and its application

研究成果: 著書/レポートタイプへの貢献会議での発言

抄録

The manipulation of spin current is a central issue in the operation of spintronic devices because the spin current plays key role both in spin-dependent transports and spin-transfer switching. Recently, a heat utilization for creating the spin current has been paid considerable attention, leading to an emerging field, spin caloritronics. One of the representative phenomena is thermal spin injection, in which excess heat can be used to produce the spin current because of the spin-dependent Seebeck coefficient [1]. However, the generation efficiency of the thermally excited spin current was quite low because of the low spin-dependent Seebeck coefficient of conventional ferromagnetic metals. The Seebeck coefficient is strongly correlated to the band structure around the Fermi level, and, under the simple approximation in metals, the coefficient is known to be proportional to the energy derivative of the logarithmic density of state (DOS) at the Fermi level. In a ferromagnetic material, since the DOS shows different features between the up and down spins, one can separately consider the moving directions of the up-spin electrons and the down-spin electrons. Therefore, in the ferromagnetic material with a large difference in the DOS between up and down spins, the sign of the Seebeck coefficient for the up-spin electron can be reversed from that for the down-spin electron. In such a situation, the up-spin and down-spin electrons flow in opposite directions, as shown in Fig. 1(a, b). Therefore, the generation efficiency of the spin current due to thermal spin injection is significantly enhanced by the large spin-dependent Seebeck coefficient.

元の言語英語
ホスト出版物のタイトル2015 IEEE International Magnetics Conference, INTERMAG 2015
出版者Institute of Electrical and Electronics Engineers Inc.
ISBN(電子版)9781479973224
DOI
出版物ステータス出版済み - 7 14 2015
イベント2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, 中国
継続期間: 5 11 20155 15 2015

その他

その他2015 IEEE International Magnetics Conference, INTERMAG 2015
中国
Beijing
期間5/11/155/15/15

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Seebeck coefficient
Nanowires
Ferromagnetic materials
Electrons
Fermi level
Magnetoelectronics
Band structure
Metals
Hot Temperature
Derivatives

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

これを引用

Kimura, T. (2015). Efficient thermal spin injection using CoFeAl nanowires and its application. : 2015 IEEE International Magnetics Conference, INTERMAG 2015 [7157260] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INTMAG.2015.7157260

Efficient thermal spin injection using CoFeAl nanowires and its application. / Kimura, Takashi.

2015 IEEE International Magnetics Conference, INTERMAG 2015. Institute of Electrical and Electronics Engineers Inc., 2015. 7157260.

研究成果: 著書/レポートタイプへの貢献会議での発言

Kimura, T 2015, Efficient thermal spin injection using CoFeAl nanowires and its application. : 2015 IEEE International Magnetics Conference, INTERMAG 2015., 7157260, Institute of Electrical and Electronics Engineers Inc., 2015 IEEE International Magnetics Conference, INTERMAG 2015, Beijing, 中国, 5/11/15. https://doi.org/10.1109/INTMAG.2015.7157260
Kimura T. Efficient thermal spin injection using CoFeAl nanowires and its application. : 2015 IEEE International Magnetics Conference, INTERMAG 2015. Institute of Electrical and Electronics Engineers Inc. 2015. 7157260 https://doi.org/10.1109/INTMAG.2015.7157260
Kimura, Takashi. / Efficient thermal spin injection using CoFeAl nanowires and its application. 2015 IEEE International Magnetics Conference, INTERMAG 2015. Institute of Electrical and Electronics Engineers Inc., 2015.
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