Abstract
The spin filtering phenomenon allows one to obtain highly spin-polarized charge carriersgenerated from nonmagnetic electrodes using magnetic tunnel barriers. The exponentialdependence of tunnel current on the tunnel barrier height is operative here. The magnetic,semiconducting europium chalcogenide compounds have strikingly demonstrated this effect.The possibility of employing ferrites and other methods opens the potential for display ofthis phenomenon at room temperature, which can be expected to lead to hugeprogress in spin injection and detection in semiconductors. But first, extremelychallenging material-related issues have to be addressed. This review covers the field.
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