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Spin injection into semiconductors from ferromagnetic materials

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This talk will start with an introduction to the field of spintronics, which aims to control electronic devices using the spin of the electron rather than the charge. The emphasis will be on ferromagnetic metal / semiconductor hybrid systems, including the resistance mismatch problem and results on all-electrical devices.

In detail, the talk will cover research carried out on the injection of spin polarized current into semiconductor p-i-n LEDs from iron and magnetite thin films. Measuring the polarization of the light emitted from the LED we can determine the polarization of the electrons across the semiconductor / metal interface. From iron films a polarization of 4.5 has been measured and from magnetite 1.6 . Reasons for the small size of the observed polarizations will be discussed.

This talk is part of the Semiconductor Physics Group Seminars series.

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