| Budget Amount *help |
¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
Fiscal Year 2013: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2011: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
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| Research Abstract |
Vertical cavity surface emitting lasers (VCSELs) driven by electrical spin injection have been investigated. We focused on the circularly polarized lasing and lasing threshold reduction caused by spin polarization in the active region of the VCSELs. We have investigated molecular beam epitaxy growth of Fe and FePt layers on GaAs(110) surfaces for the spin injection electrodes, and characterized the structures and magnetic properties of the layers. We succeeded in the spin injection into GaAs(110) quantum wells at low temperature. However, the degree of the circular polarization of the emission observed was about 5% which was unexpectedly low. A high degree of circular polarization, which was expected because of the long spin relaxation time of the electrons in GaAs(110) quantum wells, was not observed.
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