2012 Fiscal Year Final Research Report
Generation of Spin Current in Bipolar Conductors with Quasi-Zero Hall Coefficients
| Project/Area Number |
22360003
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Saitama University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
HONDA Zentaro 埼玉大学, 理工学研究科, 准教授 (30332563)
HASEGAWA Shigehiko 大阪大学, 産業科学研究所, 准教授 (50189528)
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| Co-Investigator(Renkei-kenkyūsha) |
KITAJIMA Akira 大阪大学, 産業科学研究所, 特任助教 (50532248)
OSHIMA Akihiro 大阪大学, 産業科学研究所, 特任准教授 (80398924)
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| Project Period (FY) |
2010 – 2012
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| Keywords | ローレンツ力 / 正常ホール効果 / 異常ホール効果 / 両極性伝導体 / スピン流 / ス ピントロニクス / 希土類金属 / 水素 |
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| Research Abstract |
The ordinary Hall effect (OHE), which is caused by an external magnetic field, was studied as a mechanism for the generation of spin current. It has been theoretically elucidated that, under an open-circuit condition, the OHE can contribute to spin-current generation when spin-polarized electrons and holes are simultaneously present as mobile carriers. This OHE contribution to spin current generation is caused by the steady-state kinematics of electrons and holes whose transverse velocities have the same direction. The experimental aspects of possible materials for the isomorphic electron and hole systems are argued on the basis of the experimental results of the magnetotransport measurements of the quasi-zero Hall coefficient (QZHC) conductors YH_2 and Gd_xY_<1-x>H_2. For experimental verification of spin current generation, we have investigated the influence of spin injection in these QZHC conductors by employing two type of Hall devices, the current channel region of which are (A) magneticmaterial Gd_xY_<1-x>H_2 (x≒0.4) and (B) nonmagnetic YH_2 but having Co source electrodes and a shortchannel length of approximately 10 μm. Huge anomalous Hall resistivity and positive transversemagnetoresistivity are observed in both Hall devices A and B, showing the generation of spin current.
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[Presentation] 水素吸蔵体Gd_xY_<1-x>H_2(x=0.19)の作製と磁化・ホール測定2012
Author(s)
平間弘晃,桜庭琢士,酒井政道,本多善太郎,早川昌志,大越朋哉,長谷川繁彦,北島彰,大島明博,樋口宏二,中村修
Organizer
第59回応用物理学関係連合講演会
Place of Presentation
早稲田大学早稲田キャンパス
Year and Date
2012-03-16
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[Book] 成果報告会要旨集2012
Author(s)
酒井政道,櫻庭琢士,大越朋哉,平間弘晃,大友貴史,春山翔太,長谷川繁彦,樋口宏二,北島彰,大島明博
Total Pages
26-27
Publisher
両極性伝導体Gd_xY_<1-x>H_2(x=0,0.4)におけるスピン注入と磁気抵抗文部科学省ナノテクノロジープラットフォーム事業,分子・物質合成プラットフォーム
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