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Nuclear spin polarization by out-of-plane spin injection from ferromagnet into an InAs heterostructure

Published online by Cambridge University Press:  18 May 2012

Tomotsugu Ishikura ,
Takahiro Hiraki ,
Takashi Matsuda ,
Joungeob Lee  and
Kanji Yoh
Tomotsugu Ishikura
Affiliation:
Research Center of Integrated Quantum Electronics, Hokkaido University, Sapporo, Japan
Takahiro Hiraki
Affiliation:
Research Center of Integrated Quantum Electronics, Hokkaido University, Sapporo, Japan
Takashi Matsuda
Affiliation:
Research Center of Integrated Quantum Electronics, Hokkaido University, Sapporo, Japan
Joungeob Lee
Affiliation:
Research Center of Integrated Quantum Electronics, Hokkaido University, Sapporo, Japan
Kanji Yoh
Affiliation:
Research Center of Integrated Quantum Electronics, Hokkaido University, Sapporo, Japan
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Abstract

We have investigated an InAs channel Hall-bar structure with ferromagnetic spin injector in one of the current terminals. After magnetizing the Fe electrode, spin polarized electrons are injected through the edge of the isolation mesa structure and the anomalous Hall voltage is observed, when electrons are injected from the ferromagnetic terminal. However, when electrons are injected from the non-magnetic metal (Ti/Au) of opposite terminal, the Hall voltage disappeared to the variation error level due to the fabrication imperfections. This result suggests the possibility that out-of-plane spin injection from the channel edge lead to perpendicular nuclear magnetic field. It is presumably caused by nuclear spin polarization in InAs channel near the spin source edge through Overhauser effect. The estimated internal magnetic field was 2000 Gauss.

Keywords

spintronicIII-Vferromagnetic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1396: Symposium O – Compound Semiconductors for Generating, Emitting and Manipulating Energy , 2012 , mrsf11-1396-o07-29
Copyright
Copyright © Materials Research Society 2012

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