http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Djati Handoko,김동현 한국물리학회 2012 새물리 Vol.62 No.5
The photocurrent on a Si photodiode caused at reverse bias by a linearly polarized diode laser has been systematically investigated by varying the bias voltage, the laser power, and the lock-in modulation frequency. Interestingly, the noise characteristics of the measured photocurrent exhibit a 1/f noise behavior with a scaling exponent of 0.94 ± 0.08 for all bias voltages from -4 V to -15 V, implying the existence of universality class for the 1/f noise characteristics in a photodiode detection signal irrespective of the bias voltage.
Djati Handoko,Duy-Truong Quach,이상혁,심재호,김동현,이경민,정종율,김남동,신현준 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.11
We report our investigation on the magnetic-domain structure of a Co/Pt multilayer with perpendicular magnetic anisotropy under a horizontal in-plane field by using a high-resolution scanning transmission X-ray microscope (STXM) developed at Pohang Accelerator Laboratory. The ruggedshaped striped magnetic-domain structure that was initially formed under a field cycle along the out-of-the plane magnetic easy axis was found to be stretched and elongated along the direction of the horizontal in-plane field. As the in-plane field was strengthened, the striped pattern exhibited an anisotropic domain growth with further stretching and aligning, as well as with a modification of the magnetic-domain’s width.
Handoko, Djati,Duy-Truong Quach,Sang-Hyuk Lee,Kyung Min Lee,Jong-Ryul Jeong,Dong Seok Yang,Dong-Hyun Kim IEEE 2016 IEEE transactions on magnetics Vol.52 No.2
<P>We have discovered that there exist dynamic scaling behaviors for the nucleation and the saturation field in hysteresis loop of Co/Pt multilayer thin films. The dynamic hysteresis measurement was carried out with variation of sweeping rate of cycling fields, which reveals that not only the coercivity and the loop area, well known as the Steinmetz law, but also the nucleation and the saturation field exhibit similar scaling behaviors. We have systematically analyzed the scaling factor of nucleation, coercivity, and saturation phase with respect to the Co sublayer thickness. Local structural configuration depending on the Co sublayer thickness were examined by extended X-ray absorption fine structure, implying that damping parameter and interface effect modifies the coercivity and nucleation scaling factor but does not significantly induce the change in saturation scaling factors.</P>
Lin Huang,Iwan Sugihartono,Djati Handoko,양동석,Candra Kurniawan,Erfan Handoko,김동현 한국물리학회 2019 Current Applied Physics Vol.19 No.3
We have investigated the correlation between structural and magnetic properties of M-type BaFe12O19 thin films (∼1.4 μm) with Co-Ti (magnetic/non-magnetic) and Co-Ni(magnetic/magnetic) substitution, as BaFe12- 2xCoxTixO19 and BaFe12-2xCoxNixO19 (0≤x≤1). With structural properties sensitively related to the magnetic properties, where ferro-ferri phase transition is involved, it has been found that magnetic properties can be substantially controlled by substitution concentration.
Nanometer-scale local probing of X-ray absorption spectra of Co/Pt multilayer film
Quach, Duy-Truong,Pham, Duc-Thang,Handoko, Djati,Shim, Je-Ho,Eon Kim, Dong,Lee, Kyung-Min,Jeong, Jong-Ryul,Kim, Namdong,Shin, Hyun-Joon,Kim, Dong-Hyun Elsevier 2018 PHYSICA B-CONDENSED MATTER - Vol.532 No.-
<P><B>Abstract</B></P> <P>We report our local X-ray absorption spectra (XAS) measurement mapping for a Co/Pt multilayer using scanning transmission microscopy with 25-nm spatial resolution and 0.1-eV spectral resolution. We have systematically analyzed the two-dimensional XAS intensity variation over the corresponding magnetic domain patterns, revealing a XAS profile across the magnetic domain wall as well as the simultaneous high-throughput measurement of local XAS spectra.</P>