Room Temperature Ferromagnetism in InGaN Nanostructures Induced by Cr+ ion Implantation

Nanomaterials
Zheng WangChang Liu

Abstract

This paper presents the magnetic properties of chrome ion (Cr+) implanted InxGa1-xN (x = 0.1, 0.3, 0.5 and 1.0) nanostructures grown by molecular beam epitaxy (MBE). The Cr+ implantation was conducted at 110 keV with three doses, namely 2.6 × 1015, 5.3 × 1015, and 1.3 × 1016 ions/cm2. The as-grown nanostructures exhibited diamagnetism before and after ion implantation without annealing. However, after annealing, the nanostructures exhibited ferromagnetism at room temperature. The saturation magnetization (Ms) and coercive force (Hc) increase with increasing Cr+ dose. The Ms of the InN nanorods with diameters of 100-160 nm is larger than that of those with small diameters of 60-80 nm. For InGaN nanostructures, the indium concentration-that is, the band structure-is more important than the diameters of the nanorods for the same doping level of Cr ions. The Ms of InGaN nanorods with an indium concentration of 10% reaches its maximum. The zero-field cooled (ZFC) and field-cooled (FC) curves show that nanostructures have no parasitic magnetic phases.

References

Dec 31, 2005·Physical Review Letters·X Y CuiC Stampfl
Jun 4, 2008·Physical Review Letters·Pratibha DevPeihong Zhang
Dec 3, 2010·Journal of Nanoscience and Nanotechnology·Kemin WuChang Liu
Dec 14, 2011·Advances in Colloid and Interface Science·Abhijit BiswasFranz Faupel
Jun 10, 2015·Nanoscale Research Letters·Youn Ho ParkHeon-Jin Choi
Sep 16, 2015·Journal of Nanoscience and Nanotechnology·Basanta RoulA Sundaresan

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