Ex) Article Title, Author, Keywords
Ex) Article Title, Author, Keywords
Abstract : In this paper, changes in physical properties of MgZnO:In thin films grown on a sapphire substrate using the sol-gel method were investigated as per the concentrations of In and Mg precursors. The properties of the grown thin films were analyzed using XRD, UV-Vis, Hall effect, and XPS. According to the XRD results, all samples showed the c-axis preferential orientation growth. UV-Vis analysis confirmed that the samples exhibited a transmittance of >80% in the visible region. Through the Hall effect measurement, the resistance was found to decrease with the increasing In amount. According to the XPS analysis, when >5 mol% of In was added, the Mg content decreased. The O 1s binding energy was also investigated using XPS, and the bonding state of the thin film was observed by comparing the OI/OII ratio. When >5 mol% of In was added, it interfered with the generation of oxygen vacancy during the synthesis of Mg, thus decreasing the OI/OII ratio.
Abstract : This study examined the features of student-generated drawings to foster their understanding of sound transmission. In this regard, eighteen student-generated drawings constructed by the fifth and sixth elementary science gifted students were collected and analyzed. The students were asked to draw and explain sound transmission between a tuning fork and our ears. The researchers classified the types of student-generated drawings by focusing on `air particles' and `their interactions', which are invisible, and key ideas of sound transmissions, and then analyzed the features of the students' conceptions, as visually expressed in each type. Consequently, most students focused only on the collisions among air particles, the medium transmitting sound, without conceptualizing the particle vibrations, i.e., the back-and-forth movements of particles. For example, some students drew that the particles themselves vibrate, or the particles literally transmit vibrations as if handing over an object. Finally, the educational implications were discussed in terms of alternative conceptions for elementary and middle school students and how to teach sound transmission.
Abstract : We have fabricated copper thin films by using an electroplating method. Specifically, we added an organic additive, Ralufon#14, in the plating electrolyte and observed the variation of the material property of the plated copper caused by Ralufon#14 in the electrolyte. By the addition of Ralufon#14 the crystalline orientation, grain size, and electrical resistivity changed significantly. In addition, compared to the thin films plated with pure electrolyte, the films prepared with Ralufon#14 exhibited considerable increase of the optical reflectance. The changes in crystalline orientation, grain size, and optical reflectance do not show noticeable variation when we increase the concentration of Ralufon#14 in the electrolytes.
Abstract : We analyzed the correlation between the planar Hall effect and the exchange bias according to the temperature in the NiFe/IrMn layered structure. As a result, it was confirmed that the temperature dependence of the exchange bias caused by the spin structure of IrMn determines the sensor sensitivity of the planar Hall effect. Above the critical temperature, the magnetic anisotropic property decreases as the temperature increases owing to thermal fluctuation; accordingly, the sensor sensitivity of the planar Hall effect decreases. By contrast, at low temperatures near 3 K, the exchange bias rapidly increases owing to the spin glass phenomenon caused by IrMn; thus, the sensor sensitivity of the planar Hall effect rapidly decreases. Our fundamental research on exchange bias, an important factor in determining the sensitivity of planar Hall sensors, is expected to help design more capable planar Hall sensors.
Abstract : New Physics searches using a high energy collider experiment should be performed systematically, especially when interpreting a new signal with a specific new Physics model among different possibilities. A data-driven method should be used in a model-independent way to capture all scenarios. In this article, we demonstrate how one can achieve a systematic and model-independent data analysis by separating an analysis on a new Physics signature into a phase space structure and matrix amplitude of a process. For instance, we consider a process with two visible particles and dark matter candidate signal at the high energy hadron collider. Finally, we recommend a proposed method to combine with a machine learning network and an algorithm to probe the broad scope of Physics beyond the standard model efficiently.
Byeong-Hyeon JEONG, Ji-Sang PARK*
New Phys.: Sae Mulli 2020; 70(8): 630-636
https://doi.org/10.3938/NPSM.70.630
Woo Tae Hong, Hyun Kyoung Yang
New Phys.: Sae Mulli 2021; 71(3): 236-241
https://doi.org/10.3938/NPSM.71.236
Hyeong Seon PARK, Seong-Heum PARK, Hyunbok LEE, Heung-Sik KIM*
New Phys.: Sae Mulli 2020; 70(11): 920-927
https://doi.org/10.3938/NPSM.70.920