title: Remarkable magneto-optical properties of europium selenide nanoparticles with wide energy gaps.
abstract: The enhanced magneto-optical properties of nanoscaled lanthanide chalogenide semiconductors which have a wide energy gap were observed at around 500 nm for the first time. The nanoscaled semiconductors, Eu(1-x)Se nanoparticles 1 (cubic shapes) and 2 (spherical shapes), were synthesized by the thermal reduction of Eu(III) ion with organic ligands containing Se atoms. The resulting Eu(1-x)Se nanoparticles were characterized by X-ray diffraction, high-resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, superconducting quantum interference devices magnetometer, and microwave induced plasma atomic emission spectroscopy measurements. The particle grain sizes of 1 and 2 were estimated to be 11 and 20 nm, respectively. The concentration-normalized Veldet constants (the magnitude of the Faraday effect) of Eu(1-x)Se nanoparticles were much larger than those of corresponding bulk EuSe and EuS nanoparticles.
authors.affiliation: Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan. hasegawa@ms.naist.jp
authors.forename: Yasuchika
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Taka-aki
authors.initials: TA
authors.lastname: Adachi
authors.forename: Atsushi
authors.initials: A
authors.lastname: Tanaka
authors.forename: Mohammad
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authors.lastname: Afzaal
authors.forename: Paul
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authors.lastname: O'Brien
authors.forename: Takahiro
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authors.lastname: Doi
authors.forename: Yukio
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authors.lastname: Hinatsu
authors.forename: Koji
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authors.lastname: Fujita
authors.forename: Katsuhisa
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authors.lastname: Tanaka
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kawai