in most of the present work on magnetic insulators, Bi has been doped in YIG,
What is the reason for doping YIG with Bi.
Doping the YIG with bismuth leads to a strong increase of the magneto-optical effect (Faraday rotation of the plane of light polarization) and, as consequence, increasing of the optical contrast in optoelectronics devices. In addition, substitution Y by Bi can lead to a strong induced magnetic anisotropy. See, for example, paper “Design of high-coercivity epitaxial magnetic garnet films for thermomagnetic recording and nanotechnology” / Vladimir G. Kostishyn, Alexander T. Morchenko, Denis N. Chitanov // Journal of Alloys and Compounds 02/2014; 586:s317-s321. DOI:10.1016/j.jallcom.2013.09.058 and references to it.
Good luck to You,
Alexander Morchenko
The role of bismuth in YIG system is very strange. Since 1965, after discovery the anomalous enhancement in magneto optical property of Bi-YIG, scientists continusly investigate on Bi-YIG system. Recent study show eventhough the Bi3+ is a diamagnetic ion however in YIG system due to hybridization of Bi3+ 6p at dodecahedral site with Fe3+ 3d at octahedral site, it plays as a magnetic ion. You check below paper :
http://dx.doi.org/10.1016/j.jmmm.2015.08.009
http://dx.doi.org/10.1016/j.jmmm.2015.08.009
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