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Ferromagnetism and Luminescence of Diluted Magnetic Semiconductors GaGdN and AlGdN

Published online by Cambridge University Press:  01 February 2011

Shuichi Emura ,
Masahiro Takahashi ,
Hiroyuki Tambo ,
Akira Suzuki ,
Tetsuya Nakamura ,
Yi-Kai Zhou ,
Shigehiko Hasagawa  and
Hajime Asahi
Shuichi Emura
Affiliation:
[email protected]@gmail.com, ISIR, United States
Masahiro Takahashi
Affiliation:
[email protected], ISIR, Ibaraki, Japan
Hiroyuki Tambo
Affiliation:
[email protected], ISIR, Ibaraki, Japan
Akira Suzuki
Affiliation:
[email protected], Research Organaization of Science and Engineering, Kusatsu, Japan
Tetsuya Nakamura
Affiliation:
[email protected], SPring-8/JASRI, Sayou, Japan
Yi-Kai Zhou
Affiliation:
[email protected], ISIR, Ibaraki, Japan
Shigehiko Hasagawa
Affiliation:
[email protected], ISIR, Ibaraki, Japan
Hajime Asahi
Affiliation:
[email protected], ISIR, Ibaraki, Japan
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Abstract

The magnetic characteristics of the dilute magnetic system GaGdN are investigated by mainly soft-X-ray magnetic circular dichroism (MCD) in energy range of 1160 – 1240 eV. The strong MCD signals up to 30 % at 15K are observed. The temperature dependence of its intensity is not on simple Curie-Weiss curve and depicts three-step curve. A step around 40 – 100K suggests a new magnetic phase. The luminescence spectrum of GaGdN at low temperature is divided into three parts consisting of two broad bands around 432 nm and 503 nm and a sharp peak at 652 nm. This sharp line is assigned to the intra-transition of f – f orbital owing to the weak temperature dependence of the intensity and peak position. AlGdN grown by molecular beam epitaxy produces luminescence at 318.5 nm. X-ray absorption fine structure is examined to survey the occupancy of the Gd ion in the grown specimens.

Keywords

ferromagneticGdspintronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1111: Symposium D – Rare-Earth Doping of Advanced Materials for Photonic Applications , 2008 , 1111-D03-01
Copyright
Copyright © Materials Research Society 2009

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References

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