Tunneling Spin Injection (IMAGE) University of California - Riverside Caption Atomically-thin insulating barriers greatly improve spin injection into graphene. Top image shows flow of electrons (dotted line) when no insulator is used. Flow of electron spin polarization is greatly improved (bottom image) when a magnesium oxide insulator is used as shown. Credit Kawakami lab, UC Riverside. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.