Origin and control of high-temperature ferromagnetism in semiconductors - Condensed Matter > Materials ScienceReportar como inadecuado




Origin and control of high-temperature ferromagnetism in semiconductors - Condensed Matter > Materials Science - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The extensive experimental and computational search for multifunctionalmaterials has resulted in the development of semiconductor and oxide systems,such as Ga,MnN, Zn,CrTe, and HfO2, which exhibit surprisingly stableferromagnetic signatures despite having a small or nominally zero concentrationof magnetic elements. Here, we show that the ferromagnetism of Zn,CrTe, andthe associated magnetooptical and magnetotransport functionalities, aredominated by the formation of Cr-rich Zn,CrTe metallic nanocrystals embeddedin the Cr-poor Zn,CrTe matrix. Importantly, the formation of thesenanocrystals can be controlled by manipulating the charge state of Cr ionsduring the epitaxy. The findings provide insight into the origin offerromagnetism in a broad range of semiconductors and oxides, and indicatepossible functionalities of these composite systems. Furthermore, theydemonstrate a bottom-up method for self-organized nanostructure fabricationthat is applicable to any system in which the charge state of a constituentdepends on the Fermi-level position in the host semiconductor.



Autor: Shinji Kuroda, Nozomi Nishizawa, Koki Takita, Masanori Mitome, Yoshio Bando, Krzysztof Osuch, Tomasz Dietl

Fuente: https://arxiv.org/







Documentos relacionados