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RISS 인기검색어
- 검색키워드
- 저자 : Nur Aji Wibowo (검색결과 3 건)
- 무료
- 기관 내 무료
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Low Writing Field on Perpendicular Nano-ferromagnetic
Nur Aji Wibowo,Ferdy S Rondonuwu,Budi Purnama 한국자기학회 2014 Journal of Magnetics Vol.19 No.3
For heat-assisted magnetic recording, magnetization reversal probabilities of nano-Pt/MnSb multilayer film with perpendicular magnetic anisotropy under thermal pulse activation were investigated numerically by solving the Landau-Lifshift Gilbert Equation. Magnetic parameters of nano-Pt/MnSb multilayer were used with anisotropy energy of 3 × 10<SUP>5</SUP> erg/cc and saturation magnetization of 2100 G, which offer more than 10 y data stability at room temperature. Scheme of driven magnetic field and thermal pulse on writing mechanism was designed closely to real experiment. This study found that the chosen material is potential to be used as a high density magnetic storage that requires low writing field less than two-hundreds Oersted through definite heating and cooling interval. The possibility of writing data with a zero driven magnetic field also became an important result. Further study is recommended on the thickness of media and thermal pulse design as the essential parameters of the reversal magnetization.
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Nur Aji Wibowo,Didit Budi Nugroho,Cucun Alep Riyanto 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
A temperature-dependent micromagnetic study has been conducted to examine the spin dynamics of the perpendicularly magnetized nanodot in a thermally induced magnetic switching (TIMS) scheme. The magnetic parameters used in this study represent the properties of BaFe. The impact of writing-temperatures below the Curie point on the magnetization reversal characteristic of nanodot with three damping levels, which related to the minimum writing-field as well as the zero-field-switching probability, were discussed systematically. The spins configuration of the nanodot was also presented to visualize the modes of the magnetization switching. The simulation reveals that the writing-field decreases concerning with the writing-temperature and reaches its lowest value at the temperature of 0.4 % below its Curie point. During the heating phase, the mechanism of demagnetization is coupled with the writing-temperature. Meanwhile, the magnetic damping takes over the role in the magnetic switching mechanism during the freezing.
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Photoacoustic Tomography System for Roughly Painted Micro Objects
Andreas Setiawan,Fransiscus Dalu Setiaji,Gunawan Dewantoro,Nur Aji Wibowo 한국전자파학회JEES 2019 Journal of Electromagnetic Engineering and Science Vol.19 No.3
Subsurface imaging is challenging; it is difficult to detect objects visually. In this research, a novel non-contact photoacoustic (PA) imaging system was developed to detect subsurface objects. The Rosencwaig-Gersho (RG) model was successfully employed to capture microobject images covered by rough paint. The experiments were conducted using a copper ring with a 1-mm diameter fully coated by rough paint with an average thickness of 2.3 μm. The resulting PA images exhibited up to 72% consistency despite the rough paint; the shapes of the objects were clearly recognized before and after coating. To conduct the experiment, simulations and image acquisitions were arranged. Then, the system capability to produce tomographic images was improved by adjusting the thermal diffusion lengths, and subsurface object images were successfully acquired at depths of 2.0, 2.6, 9.8, and 52 μm. The detailed composition of image slices displayed the structure profile of subsurface objects appropriately.
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