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All Journal Jurnal Ikatan Alumni Fisika Universitas Negeri Medan Science and Technology Indonesia INDONESIAN JOURNAL OF APPLIED PHYSICS
Eko Arief Setiadi, Eko Arief
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Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Energy Environmental Science Materials Science & Nanotechnology Physics

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Pengaruh Ukuran Butir (garin size) pada pembuatan Bonded Magnet NdFeB Ritawanti, Arjuna; Muljadi, Muljadi; Febrianto, Erfin Yundra; Setiadi, Eko Arief
Jurnal Ikatan Alumni Fisika Universitas Negeri Medan Vol 2, No 1 (2016): Jurnal Ikatan Alumni Fisika Unimed Edisi Januari 2016
Publisher : Ikatan Alumni Fisika Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Telah dilakukan penelitian tentang pembuatan magnet permanen bonded NdFeB dengan polimer bakelit dilakukan dengan mencampurkan serbuk magnet Neodymiun Iron Boron (NdFeB) komersil tipe MQP-B+ dengan perekat menggunakan cetakan (moulding).Sebelum serbuk NdFeB di campur dilakukan pengayakan terhadap kedua serbuk .Komposisi bakelit sebesar 0, 2,5%,  5% dan 7,5 % berat dari massa total sampel 8 gram. Campuran ini kemudian dicetak dengan metode dry compression moulding dengan tekanan sampel 5 tonforce/cm² demgan menggunakan suhu hot press sebesar 120°C,140°C,160°C dan 180°C selama 30 menit.Disini untuk mengetahui pengaruh grain size di lakukan pengayakan dalam serbuk dalam ukuran 100 Mesh dan 200 Mesh. Setelah di dapatkan hasil sampel dalam bentuk pelet di simpan dalam ruang vakum  Desicator untuk menghindari dari pengaruh oksidasi.Uji fisis  dilakukan dalam penelitian ini  dengan  mengukur Bulk density dan melihat mikrostrukur dengan menggunakan SEM.Selanjutnya uji magnetisasi dilakukan untuk mengetahui sifat magnet yang terbaik dan karakterisasi magnet dilakukan  magnet dilakukan dengan mengunakan Permagraph C untuk mengetahui nilai  induksi remanensi (Br) dalam suatu medan magnet , koersivitas (Hc) dan Energi Produksi Maksimum (BH)max.Hasil penelitian di peroleh sifat magnet yang terbaik pada ukuran 100 Mesh Bakelit 2,5%wt pada suhu  Hot  press 160 °C menghasilkan nilai kuat magnet 1.633 Gauss, Br =3,72 kG,Hci = 7,557 KOe dan BHmax = 2,85 MGOe.
Micro-Magnetic Activity of the Fabricated MnFe2O4 via Co-Precipitation from Natural Iron Sand Rianna, Martha; Hussain, Muhammad Khalid; Sembiring, Timbangen; Guk-Guk, Herwati Permata Indah Raja; Sitorus, Kurnia Jesiska; Setiadi, Eko Arief; Tetuko, Anggito P.; Sebayang, Perdamean
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.221-227

Abstract

This study explores the micromagnetic behaviour of MnFe2O4 derived from natural iron sand through the coprecipitation method, without the need for calcination. Using manganese chlo-ride and iron sand as precursors, one can create MnFe2O4. Through the utilisation of X-ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Vibrating Sample Magnetometer (VSM), one can effectively analyse and understand the crystal structure, morphology, and magnetic properties. The crystal size was reduced by a fac-tor of 0.40 nm, as revealed by XRD crystal structure analysis. Additionally, the XRD results indicated the absence of impurities, confirming the presence of a single phase. In addition, the SEM analysis revealed that samples 1, 2, and 3 underwent agglomeration. The particles have a cubic shape. The analysis using EDX indicates that there are no other elements present in the Mn, Fe, and O. Additionally, the VSM analysis confirms that the sample exhibits magnetic hardness. Sample 1 exhibits exceptional magnetic properties, with Ms values of 217.53 emu/g, Mr 34.27 emu/g, and Hc 127.42 emu/g. Photoluminescence (PL) spectroscopy was used to observe the optical properties of MnFe2O4. Sample 1 exhibits a distinct emission spectrum at 440 nm, representing the purple band. Sample 2 displays a sharp emission spectrum at 448 nm, indicating the blue band. Lastly, Sample 3 demonstrates a clear emission spectrum at 427 nm, signifying the purple band.
Sintesis Nanopartikel Cobalt Ferrite (CoFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Sifat Kemagnetannya Setiadi, Eko Arief; Shabrina, Nanda; Budi Utami, Hesti Retno; Fahmi, Nur Fadhilah; Kato, Takeshi; Iwata, Satoshi; Suharyadi, Edi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 3, No 01 (2013): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v3i01.1216

Abstract

Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized by co-precipitation method with various synthesis temperature and concentration of NaOH. The structural characteristics and particle size of CoFe2O4 were determined by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM), its showed that nanoparticles well crystallized with various grain size which depend on synthesis parameters. The grain sizes estimated using the Scherrer formula were found that the grain size increased with increasing temperature synthesis and decreasing concentration of NaOH. Magnetic characterization of CoFe2O4 nanoparticles was investigated by using a Vibrating Sample Magnetometer (VSM). Sample with various concentration of NaOH showed that coercivity was decrease with the decrease of particle size. In other hand, samples with various synthesis temperature found that sample withsmallest grain size have high coersivity. The saturation magnetization increase when crystallinity increase. Based on the results, it can be concluded that magnetic characterization of CoFe2O4 was influenced by grain size and crystallinity.
Co-Authors Anggito P. Tetuko, Anggito P. Arjuna Ritawanti, Arjuna Budi Utami, Hesti Retno Edi Suharyadi Erfin Yundra Febrianto Fahmi, Nur Fadhilah Guk-Guk, Herwati Permata Indah Raja Hussain, Muhammad Khalid Martha Rianna Muljadi Muljadi Perdamean Sebayang Satoshi Iwata Shabrina, Nanda Sitorus, Kurnia Jesiska Takeshi Kato Timbangen Sembiring