Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor

The spin-Seebeck effect was recently discovered in a metallic ferromagnet and consists of a thermally generated spin distribution that is electrically measured utilizing the inverse spin Hall effect. Here this effect is reproduced experimentally in a ferromagnetic semiconductor, GaMnAs, which allows...

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Bibliographic Details
Published in:arXiv.org 2010-07
Main Authors: Jaworski, C M, Yang, J, Mack, S, Awschalom, D D, Heremans, J P, Myers, R C
Format: Article
Language:English
Subjects:
Charge distribution
Charge transport
Current distribution
Ferromagnetism
Hall effect
Phase transitions
Polarization (spin alignment)
Seebeck effect
Spatial distribution
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Summary:The spin-Seebeck effect was recently discovered in a metallic ferromagnet and consists of a thermally generated spin distribution that is electrically measured utilizing the inverse spin Hall effect. Here this effect is reproduced experimentally in a ferromagnetic semiconductor, GaMnAs, which allows for flexible design of the magnetization directions, a larger spin polarization, and measurements across the magnetic phase transition. The spin-Seebeck effect in GaMnAs is observed even in the absence of longitudinal charge transport. The spatial distribution of spin-currents is maintained across electrical breaks highlighting the local nature of the effect, which is therefore ascribed to a thermally induced spin redistribution.
ISSN:2331-8422
DOI:10.48550/arxiv.1007.1364