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Photoluminescence and Magneto-optical Properties of Zn1−xMnxO
율다세프,강태원,Vasiliy O. Pelenovich,Uygun V. Valiev 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
Zn1−xMnxO thin films on quartz substrates with a low concentration of Mn (1%) were prepared by using ultrasonic spray pyrolysis. Photoluminescence, optical absorption, and magnetic circular dichroism (MCD) measurements were conducted in order to study the optical and the magnetic properties of Zn0.99Mn0.01O. The free exciton lines are dominant in the spectra of these samples, which indicates a high crystal quality for the films. Magneto-optical measurements show a significant MCD at the band edge of Zn0.99Mn0.01O at room temperature.
Influence of Mn-oxide Nanoclusters on the Electric Properties of ZnO:Mn Films
Vadim Sh. Yalishev,홍사환,박배호,V. Pelenovich,율다세프 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
Polycrystalline ZnO:Mn films have been deposited on Si substrates by using ultrasonic spray pyrolysis methods. ZnO:Mn (3%) films show hysteretic behaviors in the I-V curves and these behaviors are related to charging and discharging of Mn-oxide nanoclusters. The conditions for hysteresis to appear depend on the sizes of the formed Mn-oxide nanoclusters close to the electrode interfaces.
Study of the Magnetic Phase Transition in ZnMnO by Using Specific Heat Capacity Measurements
율다세프,Shavkat U. Yuldashev,강태원,Vasiliy O. Pelenovich 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
The magnetic phase transition in diluted magnetic semiconductor Zn1−xMnxO was studied by using a specific heat capacity method. Zn1−xMnxO (x = 0.05) thin films were prepared by using ultrasonic spray pyrolysis. The films were additionally doped by nitrogen in order to obtain a ptype conductivity. The magnetization (M-H) measurements, obtained by using a SQUID showed a hysteresis loop at low temperatures, which demonstrated the existence of ferromagnetic ordering in these samples. The temperature dependence of the specific heat capacity (Cp), measured without an external magnetic field, revealed a pronounced λ-shaped peak at 75 K. Such a Cp dependence indicates a well-defined second-order magnetic phase transition in the nitrogen-doped Zn0.95Mn0.05O samples.
Thermal Diffusivity Study of Weak Ferromagnetism in Zn_(1−x)Co_xO
Khusan T. Igamberdiev,Shavkat U. Yuldashev,권영해,강태원,Vasiliy O. Pelenovich,Anatoly G. Shashkov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
Thermal diffusivity measurements have been conducted in order to study the origin of ferromagnetism in Zn_(1−x)Co_xO. Thin films of Zn_(1−x)Co_xO (x = 0.03) were deposited on Si (100) substrates by using ultrasonic spray pyrolysis. Magnetization M(H) measurements at low temperaturs show a hysteresis loop, which indicates the existence of ferromagnetic ordering in Zn<SUB>0.97</SUB>Co<SUB>0.03</SUB>O. However, the magnetic moment per Co ion is much lower than expected. A comparison of M(T) measured at zero-field-cooled (ZFC) and at field-cooled (FC) conditions shows a superparamagnetic-like behavior, and the blocking temperature is about 130 K. The temperature dependence of the thermal diffusivity of Zn_(0.97)Co_(0.03)O shows a pronounced lambda-shaped minimum at 130 K, which indicates the existence of a second-order phase transition at that temperature. The weak ferromagnetism in Zn_(0.97)Co_(0.03)O with a Curie temperature of 130 K is ascribed to an uncompensated magnetic moment at the surface of CoO nanoclusters with radii of about 1 nm.
Magnetic and Optical Properties of Zn1-xMnxO Thin Films Prepared by Using Ultrasonic Spray Pyrolysis
Shavkat U. Yuldashev,전희창,강태원,율다세프,Irina V. Khvan,Vasiliy O. Pelenovich 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
Diluted magnetic semiconductor Zn1-xMnxO (x = 0.05) thin films were prepared using ultrasonic spray pyrolysis. The films were additionally doped with nitrogen in order to obtain a p-type conductivity. Aqueous solutions of zinc acetate (0.5 mol/l), manganese acetate (0.5 mol/l) and ammonium acetate (2.5 mol/l) were used as sources of Zn, Mn and N, respectively. The hole concentration in the nitrogen-doped lms was in the range of 1015 -1018 cm-3 at room temperature. The dependence of the magnetization on the magnetic field (M-H) for the highly nitrogen-doped Zn0.95Mn0.05O sample showed a hysteresis loop at low temperatures. A Curie temperature of around 80 K for the sample with a hole concentration of 1018 cm-3 was determined from the temperature dependence of the magnetization.