Room temperature electrical spin injection into GaAs by an oxide spin injector.

Abstract:

:Spin injection, manipulation and detection are the integral parts of spintronics devices and have attracted tremendous attention in the last decade. It is necessary to judiciously choose the right combination of materials to have compatibility with the existing semiconductor technology. Conventional metallic magnets were the first choice for injecting spins into semiconductors in the past. Here we demonstrate the electrical spin injection from an oxide magnetic material Fe3O4, into GaAs with the help of tunnel barrier MgO at room temperature using 3-terminal Hanle measurement technique. A spin relaxation time τ ~ 0.9 ns for n-GaAs at 300 K is observed along with expected temperature dependence of τ. Spin injection using Fe3O4/MgO system is further established by injecting spins into p-GaAs and a τ of ~0.32 ns is obtained at 300 K. Enhancement of spin injection efficiency is seen with barrier thickness. In the field of spin injection and detection, our work using an oxide magnetic material establishes a good platform for the development of room temperature oxide based spintronics devices [corrected].

journal_name

Sci Rep

journal_title

Scientific reports

authors

Bhat SG,Kumar PS

doi

10.1038/srep05588

subject

Has Abstract

pub_date

2014-07-07 00:00:00

pages

5588

issn

2045-2322

pii

srep05588

journal_volume

4

pub_type

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