Effective optical Faraday rotations of semiconductor EuS nanocrystals with paramagnetic transition-metal ions.
Novel EuS nanocrystals containing paramagnetic Mn(II), Co(II), or Fe(II) ions have been reported as advanced semiconductor materials with effective optical rotation under a magnetic field, Faraday rotation. EuS nanocrystals with transition-metal ions, EuS:M nanocrystals, were prepared by the reduction of the Eu(III) dithiocarbamate complex tetraphenylphosphonium tetrakis(diethyldithiocarbamate)europium(III) with transition-metal complexes at 300 °C. The EuS:M nanocrystals thus prepared were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), inductively coupled plasma atomic emission spectroanalysis (ICP-AES), and a superconducting quantum interference device (SQUID) magnetometer. Enhanced Faraday rotations of the EuS:M nanocrystals were observed around 550 nm, and their enhanced spin polarization was estimated using electron paramagnetic resonance (EPR) measurements. In this report, the magneto-optical relationship between the Faraday rotation efficiency and spin polarization is discussed.
Faculty of Engineering, Hokkaido University, N13 W8, Sapporo, Hokkaido 060-8628, Japan. hasegaway@eng.hokudai.ac.jp
Yasuchika
Y
Hasegawa
Masashi
M
Maeda
Takayuki
T
Nakanishi
Yoshihiro
Y
Doi
Yukio
Y
Hinatsu
Koji
K
Fujita
Katsuhisa
K
Tanaka
Hitoshi
H
Koizumi
Koji
K
Fushimi