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All Journal Medula JUPE Jurnal Ekonomi & Kebijakan Publik ITEj (Information Technology Engineering Journals) JOIN (Jurnal Online Informatika) Halaman Olahraga Nusantara : Jurnal Ilmu Keolahragaan Jurnal SPORTIF : Jurnal Penelitian Pembelajaran Teknologi Indonesia E-Link: Jurnal Teknik Elektro dan Informatika Jurnal Pendidikan Jasmani (JPJ) Jurnal Teknologi Pendidikan : Jurnal Penelitian dan Pengembangan Pembelajaran Journal of Physical Activity and Sports (JPAS) Makara Journal of Science Molekul: Jurnal Ilmiah Kimia Neraca: Jurnal Ekonomi, Manajemen dan Akuntansi The Journal of Business and Management Research Aisyah Journal Of Physical Education Jurnal Pendidikan Jasmani, Olahraga dan Kesehatan (Jp.jok)
Candra Kurniawan
FBS UNP
Humanities Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Neuroscience Public Health Social Sciences Other

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Journal : Makara Journal of Science

 1 
Micromagnetic Study on the Magnetization Reversal of Barium Hexaferrite (BaFe12O19) Thin Film Djuhana, Dede; Oktri, Dita; Kurniawan, Candra
Makara Journal of Science Vol. 22, No. 4
Publisher : UI Scholars Hub

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Abstract

This study investigates a magnetization reversal mechanism based on the hysteresis curve of Barium Hexaferrite (BFO) thin film by micromagnetic simulation through parallel and perpendicular magnetization directions along the axes. The hexagonal shape of the BFO film was modeled with thicknesses of 5, 10, and 15 nm and a diameter size ranging from 50 to 100 nm. It was found that the coercivity field HC and the saturation field HS of the BFO film decreased as thediameter size increased and thickness decreased. It was observed that the nucleation field HN increased as the diametersize increased. An analysis of energies showed that the demagnetization energy was dominantly influenced by the diameter and thickness in comparison to the anisotropic energy. From the hysteresis curve, the switching time was also investigated. Interestingly, the switching time was faster for the thinner BFOs with a diameter under 70 nm. For particles larger than 70 nm in diameter, the switching time showed fluctuation irrespective of the BFO thickness. Based on these results, a diameter size of 70 nm is proposed as the critical size for producing the equal time for switching domain polarity.
Investigation of Microstructure and Magnetic Properties of Zn1-xMnxO and Zn0.98-xMnxFe0.02O (x = 0, 0.05, and 0.09) prepared by Solid-state Reaction Method Sebayang, Perdamean; Kurniawan, Candra; Lubis, Ridwan Y; Priyadi, Ignu; N, Nasruddin M; Aryanto, Didik
Makara Journal of Science Vol. 24, No. 2
Publisher : UI Scholars Hub

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Abstract

In this study, we investigated the microstructure and magnetic properties of Zn1-xMnxO and Zn0.98-xMnxFe0.02O (x = 0, 0.05, and 0.09) powders prepared by the solid-state reaction method. The starting material, which consisted of ZnO, Mn, and Fe powders, were wet milled for 3 hours using high-energy milling. We then used an X-ray diffractometer (XRD), scanning electron microscope, and vibrating sample magnetometer to investigate the effects of doping and co-doping on the microstructure, morphology, and magnetic properties, respectively. The XRD results suggest that Mn and Fe ions had substituted into the ZnO matrix, as illustrated by the resulting single-phase polycrystalline hexagonal wurtzite structures. The diffraction intensity was observed to decrease as the Mn composition increased. The analysis showed that the lattice parameters decreased due to Mn2+ and Fe3+ ion substitution in the ZnO matrix. The co-doping of Mn-Fe ions in the ZnO structure enhanced the magnetic properties, particularly due to the Zn0.89Mn0.09Fe0.02O composition. The increase in the Mn dopant and Mn-Fe co-dopant concentrations strongly contributed to the improved morphology and magnetic properties. Therefore, we can conclude that the presence of Mn and Fe co-dopants in the ZnO system contributed to its magnetic properties, as confirmed by high-saturation magnetization.
Co-Authors Agung Triayudi Andrameda, Yurian A Anggito Pringgo Tetuko Ardi Adji, Ardi Ayunita, Devi Badar, Muh Bagaskoro, Ki Priyo Daulay, Suryani Agustina Dede Djuhana Dewanti, Aqila Didik Aryanto Dina Rahmawati Erfan Handoko Farhati, Soraya Faturrahman, Syahid Fauziah Fauziah Finaldi, Rizky Akbar Firmansyah, Guntur Ghoshal, Sib Krishna Hadi Hadi Haniifah, Yumnaa Herman Tarigan Herpratiwi Herpratiw Husen, Sjamsiar Isnaini, Nurul Hidayatul Iswarini, Septi Jatmika, Jumaeda Juliyana, Ujang T Khairun Nisa Lazuardi Umar Lestari, Dinda Lubis, Ridwan Y Magfur, Mochammad Fadhli Marta Dinata Masno Ginting Mudrik Alaydrus Muhajirin , Muhajirin Mukhtar Effendi N, Nasruddin M Novriansyah Novriansyah, Novriansyah Nugraha, Pratama Dharmika Nurseto, Fransiskus Oktri, Dita Perdamean Sebayang Priyadi, Ignu Priyono, Dwi Purwanto, Budi A Putri, Chikal Nikmah Retno Supriyanti Riswandi Riswandi Rohmah, Mutia Nur Rohmah S, Fransiskus Nurseto S, Lungit Wicaksono Saniar, Elza Setiadi, Eko A Shinta, Tasya Dwi Siadari, Hecekiel Mangoloi Siswoyo, Joan Suwarli Tamtowi, Tomy Usman Pakasi Wahyu Tri Cahyanto Wahyu Widanarto, Wahyu Wicaksono , Lungit Wicaksono, Lungit Yaya Sonjaya