The role of magnetic polarons in ferromagnetic GdN
Franck Natali, Ben Ruck, Joe Trodahl, Do Le Binh, Stephane Vezian,, Benjamin Damilano, Yvon Cordier, Fabrice Semond, and Claire Meyer
TL;DR
This paper investigates how magnetic polarons centered on nitrogen vacancies influence the magnetic and charge transport properties of ferromagnetic GdN, helping to reconcile experimental and theoretical Curie temperatures.
Contribution
It reveals the role of magnetic polarons in GdN, extending understanding of ferromagnetic semiconductors and addressing a long-standing discrepancy in Curie temperature predictions.
Findings
Magnetic polarons are formed around nitrogen vacancies in GdN.
The formation of magnetic polarons explains the Curie temperature discrepancy.
The study extends concepts applicable to ferromagnetic semiconductors like EuO.
Abstract
We report an interplay between magnetism and charge transport in the ferromagnetic semiconductor GdN, pointing to the formation of magnetic polarons centred on nitrogen vacancies. The scenario goes some way to resolving a long-standing disagreement between the measured and predicted Curie temperature in GdN. It further constitutes an extension of concepts that relate closely to the behaviour of ferromagnetic semiconductors generally, and EuO in particular.
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