Induced magnetic moment of Eu3+ ions in GaN

Kachkanov, Vyacheslav V. and Wallace, M. J. M.J. and Van Der Laan, Gerrit G. and Dhesi, Sarnjeet S. S.S. and Cavill, Stuart A. S.A. and Fujiwara, Yasufumi Y. and O'Donnell, Kevin Peter K.P. (2012) Induced magnetic moment of Eu3+ ions in GaN. Scientific Reports, 2 (Decemb). ISSN 2045-2322

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    Abstract

    Magnetic semiconductors with coupled magnetic and electronic properties are of high technological and fundamental importance. Rare-earth elements can be used to introduce magnetic moments associated with the uncompensated spin of 4f-electrons into the semiconductor hosts. The luminescence produced by rare-earth doped semiconductors also attracts considerable interest due to the possibility of electrical excitation of characteristic sharp emission lines from intra 4f-shell transitions. Recently, electroluminescence of Eu-doped GaN in current-injection mode was demonstrated in p-n junction diode structures grown by organometallic vapour phase epitaxy. Unlike most other trivalent rare-earth ions, Eu3+ ions possess no magnetic moment in the ground state. Here we report the detection of an induced magnetic moment of Eu3+ ions in GaN which is associated with the 7F2 final state of 5D0→7F2 optical transitions emitting at 622 nm. The prospect of controlling magnetic moments electrically or optically will lead to the development of novel magneto-optic devices.