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All Journal BERKALA FISIKA IPTEK The Journal for Technology and Science Indonesian Journal of Chemistry Molekul: Jurnal Ilmiah Kimia Risalah Fisika Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang Jurnal Serambi Abdimas Molekul: Jurnal Ilmiah Kimia
Wahyu Tri Cahyanto
Department Of Physics, Universitas Jenderal Soedirman, Jl. Dr. Soeparno, Karangwangkal, Purwokerto 53123, Indonesia
Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Environmental Science Materials Science & Nanotechnology Physics Other

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Journal : BERKALA FISIKA

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PENGARUH ADITIF BaCO3 PADA KRISTALINITAS DAN SUSEPTIBILITAS BARIUM FERIT DENGAN METODA METALURGI SERBUK ISOTROPIK Nugraha, Priska R.; Widanarto, Wahyu; Cahyanto, Wahyu Tri; Kuncoro, Handoko S.
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015
Publisher : BERKALA FISIKA

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Influences of concentration of BaCO3 on crystallinities and susceptibilities of barium ferrites using isotropic powder metallurgy method of fabrication is studied based on the characterization of X-Ray Diffraction (XRD), crystallite size distributions and hysteresis curve of Vibrating Sample Magnetometer (VSM).  In this study, Fe2O3 of Cilacap iron sands are doped with BaCO3 with various concentrations of 15%, 30% and 45% at 1100 °C of sintering temperature.  The results show that the addition of BaCO3 affects the formation of the multi-phase barium ferrite crystals and widen the crystallite size distribution, as well as lowering the saturations and the magnetic remanences. The optimum composition for barium ferrite magnets is obtained for 15% of BaCO3, with the highest mass susceptibility of 2.4 × 10-6 M3/Kg. Keywords: Barium hexaferrites, isotropic powder metallurgy, crystal characterizations, permanent magnets
PENINGKATAN SIFAT MAGNETIK MATERIAL HEMATIT MELALUI SUBTITUSI BARIUM DAN KONTROL TEMPERATUR SINTERING Widanarto, Wahyu; Fauzi, Fuzi Nurrahman; Cahyanto, Wahyu Tri; Effendi, Mukhtar
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

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Ferrite magnet or ceramic magnet is a competitive product in the magnet market due to low price, corrosion resistant and chemically stable. Barium hexa-ferrite magnet is one of ferrite magnet which is mostly used as magnetic storage and electronic devices based on nanotechnology. Barium hexa- ferrites are synthetized through solid state reaction method at sintering temperatures of 1100 °C with the composition (100-x)Fe2O3 : xBaCO3 , where x = 0 and 20 in mol % . Results of XRD characterization show that the diffraction peaks of XRD spectrum is dominated by the peaks of barium ferrite crystal with a hexagonal crystal system. Magnetic properties of Fe2O3 material doped with barium carbonate of 20 mol % and sintered at 1100 °C increase significantly compared to the others. This simple and inexpensive method is very promising for the manufacture of barium hexa-ferrite materials with natural ferrite as the main material.Keywords: Iron sand, barium ferrite, structure, magnetic properties
PERHITUNGAN ANALITIK PEMECAHAN SPIN RASHBA PADA QUANTUM DOT GaAs DALAM POTENSIAL PARABOLIK DUA DIMENSI Tri Cahyanto, Wahyu; Hidayanto, Eko
BERKALA FISIKA Vol 16, No 2 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

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Analytical calculation of Rashba spin-splitting on the GaAs-based quantum dots in the twodimensionalparabolic confinement. It has been investigated the spin splitting due to the Zeeman effectand a Rashba-type spin-orbit coupling on a disk-like GaAs-based quantum dot. Calculations weredone analytically considering the influence of an external magnetic field applied perpendicularly tothe dot. The result shows that spin-orbit interaction causes a “crossing” on the electron energy statesin the dot with the same angular momentum and different spin polarizations in a nonzero magneticfield. The calculated magnitudes of spin splitting and magnetic fields at the crossing level can be usedto discuss more realistic quantum dots model theoretically on the further research.Keywords: Rashba spin-orbit coupling, GaAs-based quantum dots, crossing levels
Co-Authors Abdul Basit Abraha, Kamsul Aris Haryadi, Aris Candra Kurniawan Eko Hidayanto Erfan Handoko Fibrika, Muhammad Syah Fuzi Nurrahman Fauzi, Fuzi Nurrahman Ghoshal, Sib Krishna Handoko S. Kuncoro, Handoko S. Hartono Hartono Haryadi, Aris Imam Fadli, Imam Mudrik Alaydrus Mukhtar Effendi Nurwantoro, Pekik Priska R. Nugraha, Priska R. Sehah Sehah Sunardi Sunardi Umi Pratiwi, Umi Wahyu Widanarto, Wahyu Yulin Elina