Tuning optical and ferromagnetic properties of thin GdN films by nitrogen-vacancy centers

Reddithota Vidyasagar (), Shinya Kitayama, Hiroaki Yoshitomi, Takashi Kita, Takahiro Sakurai and Hitoshi Ohta

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 2, 1-4

Abstract: AlN/GdN/AlN double heterostructures were grown on c-sapphire substrates using a reactive rf sputtering method under high vacuum conditions. The optical absorption spectrum of the GdN shows a clear fundamental band edge of GdN around 800 nm; this transition is attributed to the minority spin band energy of GdN at the X point. Nitrogen vacancy centers cause a blue-shift of the optical band edge of GdN, which could be ascribed to both the band filling, and the electron-hole interactions resulting from the free carriers generated by nitrogen vacancies. Temperature-dependent magnetization measurements demonstrate a clear change in the magnetization values of GdN with respect to the N 2 partial pressure. Nitrogen vacancy centers in the thin GdN film raise the Curie temperature from 31 K to 39 K, which has been accurately measured by the Arrott plots. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Keywords: Topical issue: Excitonic Processes in Condensed Matter; Nanostructured and Molecular Materials. Guest editors: Maria Antonietta Loi; Jasper Knoester and Paul H. M. van Loosdrecht (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1140/epjb/e2012-30566-3

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