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All Journal Jurnal Ilmu Dasar BERKALA SAINSTEK JURNAL FISIKA ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Penelitian Pendidikan IPA (JPPIPA) INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Pendidikan Fisika dan Keilmuan (JPFK) Jurnal Ilmu Fisika Majalah Ilmiah Matematika dan Statistika (MIMS) Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Journal of Energy, Material, and Instrumentation Technology PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Newton-Maxwell Journal of Physics TEFLICS InSTEM

Lutfi Rohman

Jurusan Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Jember (UNEJ)

Author-ID : 3652611

Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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Study of the Ferromagnetic Magnetite Resonance (Fe3O4) Forms of Thin Films Using Micromagnetic Simulation Salsabila, Syefira; Rohman, Lutfi; Purwandari, Endhah
Computational And Experimental Research In Materials And Renewable Energy Vol 3 No 1 (2020): May
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v3i1.26414

Fe3O4 is the strongest magnet among other iron oxides. Magnetite Fe3O4 is applied as a permanent magnet. The hysteresis curve of the permanent magnet Fe3O4 has a coercivity field that is not too large so that the material has a good chance to be applied as an absorbent material for RADAR waves. Micromagnetic simulations were carried out on Fe3O4 material in the form of thin film against hysteresis curves and ferromagnetic resonances at various thickness variations and side length variations, and the relationship was seen with changes in the bandwidth of the radar wave absorption frequency if the thickness variation of the simulated material had the same multiple as the experimental material. The thickness variations in this study were 60 nm, 90 nm, and 120 nm, where the variations in the experiment were 0.6 mm, 0.9 mm, and 1.2 mm. Micromagnetic simulation runs were performed to obtain the hysteresis curve and resonance frequency of the Fe3O4 material. The simulation results show that the resonant frequency increases with increasing thickness (fixed side length). Meanwhile, the relationship between the resonant frequency and the side length of the thin film is inversely related. Changes in the resonant frequency of Fe3O4 material are closely related to changes in the absorption frequency band of Fe3O4 material. The hysteresis curve obtained shows that the Fe3O4 material is a hard magnetic material. Changes in the resonant frequency of Fe3O4 material are closely related to changes in the absorption frequency band of Fe3O4 material. The hysteresis curve obtained shows that the Fe3O4 material is a hard magnetic material. Changes in the resonant frequency of Fe3O4 material are closely related to changes in the absorption frequency band of Fe3O4 material. The hysteresis curve obtained shows that the Fe3O4 material is a hard magnetic material.

Study of Phenomenon STT (Spin Transfer Torque) on Permalloy NiFe Material Shaped Nanowire Using Micromagnetic Simulation Ni’mah, Khiptiatun; Rohman, Lutfi; Purwandari, Endhah
Computational And Experimental Research In Materials And Renewable Energy Vol 2 No 1 (2019): May
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v2i1.20555

STT is a process of controlling the spin currents in spintronic. This simulation aims to know the properties of NiFe permalloy materials' properties by studying STT phenomenon-shaped nanowire that can be applied in storage devices, like MRAM. The material's magnetic properties include magnetization value, energy in the ferromagnetic system, and the speed of the domain wall movement, obtained by injecting the electric current density through a micromagnetic simulation using the NMAG program. This simulation's result is that the domain wall's position will shift faster along the nanowire when we inject current density to the nanowire. Current density injection will produce a domain wall pressure on the domain structure, resulting in a change in the material's magnetization value. The graph of magnetization relation to time (M-t), shown along with the increasing electric current density, we obtain oscillation magnetization change will increase. The larger the given diameter, the total energy generated will increase, demagnetization energy tends to be greater than the energy exchange. The greater the polarization of the material provided at the same diameter, the speed of the domain wall movement will be greater too.

Analysis of Tensile Strenght and Shear Modulus of GRE Pipe using Ansys Puspita, Dita; Arofah, Siti Lailatul; Hidayah, Elok; Rohman, Lutfi; Syarifah, Ratna Dewi
Computational And Experimental Research In Materials And Renewable Energy Vol 1 No 1 (2018): November
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v1i1.19544

Composite materials (GRE pipe) had been applied in various industries. These kind application are based on the advantages of composite properties, that are lightweight, high corrosion resistance and low cost. In order to make a lightweight and strong materials, some materials that light and stiff had been widely used, lie fiber glass, epoxy and the other. These materials (fiber glass and epoxy) are synthetic and non-biodegradable, but give some advantages in composite to make composite more stiff, light and strong. Mechanical properties of fiber glass composites had been doing based on theory through modeling. Theoretical results obtained showed that maximum stress and shear modulus value of GRE pipe are less than each components (glass fiber and epoxy resin). Each value of maximum stress and shear modulus are 584,57 MPa and 46,15 MPa.

Magnetic Susceptibility of Ferromagnetic Alloy Material Co (1-x) Ni (x) Nanocube and Nanosphere Models Wahyudi, Imam; Rohman, Lutfi; Purwandari, Endhah
Computational And Experimental Research In Materials And Renewable Energy Vol 2 No 2 (2019): November
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v2i2.28539

A hard disk is a data storage medium composed of a thin layer of magnetic material. Hard drives take advantage of the characteristics of magnetic materials that are stable to heat and have sensitivity to magnetic fields. One of the best materials to use a thin layer ferromagnetic on a hard disk is CoNi alloy. Hard drives with larger storage capacities require magnetic materials with high magnetic susceptibility values and Curie temperatures to obtain the best magnetic properties. The magnetic susceptibility of alloy ferromagnetic material Co (1- x) Ni (x) nanocube and nanosphere is calculated using vampire-based micro magnetic simulation. The research was conducted using a literature review on the parameters of the CoNi alloy material, and then it was simulated in the vampire program. The data generated from the simulation are magnetic susceptibility (1/tesla) and temperature (K). The spectrum of the magnetic susceptibility graph that shifts to the right as the Ni (x) composition decreases, it is assumed that the higher Curie temperature is produced. Otherwise, The increase in Ni (x) composition causes the magnetic susceptibility spectrum to shift to the left, with the Curie temperature's predicted value getting minor than the other. The nanocube-shaped material has a higher susceptibility value than the nanosphere-shaped material in terms of each Ni (x) composition variation at its maximum magnetic susceptibility.

Electric Power Analysis and System Optimization of Micro-Hydro Power Plants at the Sentool Plantation, Jember Irvan Siswanto; Artoto Arkundato; Lutfi Rohman; Bowo Eko Cahyono
Jurnal Inovasi Sains dan Teknologi untuk Masyarakat Vol. 1 No. 1 (2023): Mei
Publisher : Faculty of Mathematics and Natural Sciences, University of Jember. Jl. Kalimantan No.37, Krajan Timur, Jemberlor, Kec. Sumbersari, Jember Regency, East Java 68121

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/instem.v1i1.360

Sentool Plantation is a plantation area, agro-industrial and agro-tourism are located in Suci Village, Panti District, Jember Regency. This area is at the foot of Mount Argopuro with abundant water sources. In this area there is a river flow that can be utilized as a micro-hydro power plant (PLTMH). PLTMH is a relatively easy power plant to make and apply in rural areas or villages. PLTMH was chosen as an alternative energy source with the principle of developing renewable energy Therefore, in this community service activity want to effort to analyze potency of electric power generation and optimization of the MHP System at the Sentool Plantation which is useful as a consideration PLTMH development to meet the electricity needs of the local community and electricity needs for the development of agro-tourism. Power potential analysis process and optimization of the PLTMH system is carried out with two stages of data analysis, namely the calculation of the potential power theoretical and simulation using HOMER Energy software. HOMER Energy is used for profit simulation. The greatest potency generated power is 53.12 kWh with a discharge of 0.398 m3/s and the smallest is 18.05 kWh with a discharge of 0.135 m3/s. Simulations using HOMER Energy software produce system configurations PLTMH with an estimated capital cost of IDR 48,600,000, operational costs and maintenance 42,900,000 per year, NPC of IDR -2,557,215,000, LCoE of IDR-573.63. PLTMH has a capacity of 37.1 kW with annual production of 290,573 kW, get a profit of IDR 212,747,987.50 from the sale of energy. The results of the calculation of the water discharge, the height of the water fall and the generated power are quite high, the water flow in the Sentool Plantation is technically feasible to build a micro-hydro power plant (PLTMH).

Molecular Dynamics Study for Inhibition of Iron Corrosion in High-Temperature Liquid PbBi with Nobel Gas Inhibitors Sa’adah, Umi; Arkundato, Artoto; Rohman, Lutfi
Jurnal ILMU DASAR Vol 17 No 2 (2016)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Molecular dynamics is a popular method to observe the movement of interacting molecules. In this study molecular dynamics method was used to observe the phenomenon of iron corrosion and analyze effect of noble gases as a corrosion inhibitor for iron in liquid metal PbBi. Physical quantities are evaluated from the results of this study including: Mean Square Displacement (MSD), the diffusion coefficient, and for the crystal structure is visualized using Ovito program. The ron is placed in the middle high temperature liquid PbBi, the noble gases is injected into the liquid metal. Based on the three kinds of the noble gases (helium, neon, and argon) thhat injected into the molten metal PbBi, it obtained that Argon is the most effective in inhibiting the corrosion of iron. Argon is able to reduce the corrosion rate of 80.29% iron for temperature of 1023K. One reason to use the noble gas because these gases are difficult to react with other elements. Keywords: Molecular Dynamics, Corrosion in Liquid metals, Nobel Gases, Inhibitors

Study of A Phenomenon STT (Spin Transfer Torque) on the Material La0.7Sr0.3MnO3 Shaped Nanowire Using Micromagnetic Simulation Rohman, Lutfi; Musyarofah, L.; Purwandari, Endhah
Jurnal ILMU DASAR Vol 18 No 2 (2017)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

STT (Spin Transfer Torque) can be referred to as a process of manipulation and control of spin current in the field of spintronics. When the material is ferromagnetic nanowire La0.7Sr0.3MnO3injected currents will move the domain wall with accompanying changes of spin currents. In mikromagnetik simulation shows that the application is capable of producing flow velocity or pressure of domain wall in the direction of electron flow. The domain wall pressure generating magnetization changes with increasing current density occurs. To that end, the simulation research was done in order to obtain the effect of the injection of electric current to the magnetization of the material. This phenomenon is simulated by modeling the material into the 3D geometry. The greater the current density is given the domain wall velocity or pressure on the nanowire faster so that the magnetization process is also faster. Changes in the velocity of the fastest domain wall is obtained when the material is injected with a current density as well as M-t get a graph showing oscillation pattern that is denser when the current is increased. Furthermore, the total energy analysis with variations in size diameter of 10 nm, 20 nm and 30 nm. The results show that with increasing diameter, total energy tends to increase. Keywords: spin transfer torque, La0.7Sr0.3MnO3, magnetisation, domain wall, ferromagnetic

Studi Resonansi Feromagnetik BaFe12O19 Menggunakan Simulasi Mikromagnetik Wicaksono, Angga; Rohman, Lutfi; Supriyanto, Edy
BERKALA SAINSTEK Vol 6 No 1 (2018)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v6i1.7771

Barium Hexaferit (BaFe12O19) adalah magnet keramik golongan ferit. Ferit diaplikasikan sebagai magnet permanen dan mempunyai struktur hexagonal close-pakced (HCP). Kurva histerisis magnet permanen jenis ini memiliki koersivitas yang relatif tidak besar sehingga senyawa tersebut juga berpeluang cukup baik untuk diaplikasikan sebagai media penyimpanan data (magnetic recording) berupa patterned media. Penelitian ini mengkaji sifat-sifat magnetik bahan BaM berbentuk hexagonal terhadap kurva histerisis dan sifat resonansi feromagnetik pada berbagai variasi ukuran (meliputi : ketebalan dan diagonal hexagonal). Running simulasi mikromagnetik dilakukan untuk mendapatkan kurva histerisis dan frekuensi resonansi bahan BaM. Frekuensi resonansi meningkat (heksagonal diagonal tetap pada 12 nm) dengan bertambahnya ketebalan bahan BaM (misal pada ketebalan 24 nm diperoleh frekuensi resonansi sebesar 21,7 GHz dan pada ketebalan 36 nm diperoleh frekuensi resonansi sebesar 22,4 GHz), hal ini dikarenakan dengan bertambahnya ukuran ketebalan bahan BaM posisi spin terlihat sangat teratur. Sedangkan hubungan frekuensi resonansi dengan diagonal hexagonal yaitu kebalikannya.Kata Kunci: BaFe12O19, Simulasi mikromagnetik, Frekuensi resonansi

Effect of Nitrogen Composition on Band Gap Energy and Photocatalytic Activity of TiO2-N/Zeolite Composite Al Islam, Hanif Mufti; Sutisna, Sutisna; Rohman, Lutfi
Jurnal ILMU DASAR Vol 26 No 1 (2025)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v26i1.51887

In this study, the application and performance of TiO2-N/Zeolite composites for MB photodegradation under UV irradiation have been reviewed. To improve the removal performance, the TiO2-N/Zeolite composite was varied based on the concentration ratio of urea to TiO2, where urea is a precursor of nitrogen. UV-Vis DRS tests were also carried out to compare and evaluate differences in band gap energy for each variant, analysis of degradation results and MB removal mechanisms by TiO2-N/Zeolite composites are described in this study. The aim of this research is to determine the effect of the urea to TiO2 concentration ratio (urea:TiO2), on the photocatalytic activity of the TiO2-N/Zeolite composite and also its physical characteristics, namely band gap energy. Thus, as a comparison, TiO2 and TiO2-N were also tested for photocatalytic activity and band gap energy physical characteristics. The conclusion obtained from this research is that the smaller the nitrogen composition in the TiO2-N/Zeolite composite, the greater the photocatalytic activity capability in degrading MB, in this case the TiO2-N/Zeolite (1.5) sample has the best photocatalytic activity. The next conclusion is that the higher the nitrogen composition in the TiO2-N/Zeolite composite, the smaller the band gap energy.

Antena Mikrostrip Double E-Shaped dengan Frekuensi 3,3 GHz untuk Aplikasi WiMax MUTMAINNAH, MUTMAINNAH; NUR OCTAVINA, CHOIRINA RACHMA; ROHMAN, LUTFI; FIRDAUS, ROHIM AMINULLAH
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 10, No 3: Published July 2022
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v10i3.555

ABSTRAKAntena mikrostrip double E-shaped untuk aplikasi WiMax melalui proses simulasi dan fabrikasi telah berhasil dirancang. Perancangan desain antena mikrostrip ini menggunakan bahan substrat FR-4 lossy dengan ketebalan 1,6 mm dan konstanta dielektrik 4,6. Dimensi substrat yang dirancang yaitu 45 mm x 52 mm x 1,6 mm. Hasil simulasi yang diperoleh yaitu antena mikrostrip bekerja di frekuensi 3,3 GHz, return loss -21 dB, VSWR 1,23, bandwidth 342 MHz, dan gain sebesar 3,5 dBi. Hasil pengukuran diperoleh antena mikrostrip bekerja di frekuensi 3,35 GHz, return Loss -22 dB, VSWR 1,26, bandwidth 265 MHz, dan gain sebesar 3,2 dBi. Baik hasil simulasi dan pengukuran pola radiasi yang dihasilkan membentuk pola bidirectional. Antena mikrostrip ini dapat diaplikasikan pada frekuensi Wimax.Kata kunci: Antena Mikrostrip, Double E-shaped, Frekuensi 3,3 GHz, WiMax, Return LossÂ ABSTRACTThe double E-shaped microstrip antenna for WiMax application through simulation and fabrication process has been successfully designed. The design of this microstrip antenna using a lossy FR-4 substrate material with a thickness of 1.6 mm and a dielectric constant of 4.6. The dimensions of the designed substrate are 45 mm x 52 mm x 1.6 mm. The simulation results obtained that microstrip antenna works at a frequency of 3.3 GHz, return loss -21 dB, VSWR 1.23, bandwidth 342 MHz, and gain of 3.5 dBi. The measurement results obtained that the microstrip antenna works at a frequency of 3.35 GHz, return loss of -22 dB, VSWR of 1.26, bandwidth of 265 MHz, and gain of 3.2 dBi. Both the simulation results and the resulting radiation pattern measurements form abidirectional pattern. This microstrip antenna can be applied at WiMax frequency. Keywords: Microstrip Antenna, Double E-shaped, Frequency 3.3 GHz, WiMax, Return Loss

Co-Authors Agus Setyo Budi Al Islam, Hanif Mufti Arofah, Siti Lailatul Artoto Arkundato Ayudia, Siti Aisyah Cahyono, Bowo Eko Cuk Imawan Dita Puspita, Dita Edy Supriyanto Endhah Purwandari Fachry Abda El Rahman Febiantoro, Muhamad Rony Firdaus, Rohim Aminullah Fitri Ayu Sundari Hadi Nasbey Hasanah, Irmawati Hidayah, Elok Hidayat, Umar Sahiful I Made Astra Imam Wahyudi Indrawan, Imam Wahyudi Irvan Siswanto Iwan Sugihartono Karomah, Iklimatul Mabruri, Ahmad Muzaki Maulana, Muhammad Rizqi Mohammad Ali Shafii Musyarofah, L. Mutmainnah Mutmainnah Nikodemus Umbu Janga Hauwali Ni’mah, Khiptiatun NUR OCTAVINA, CHOIRINA RACHMA Prasetya, Fajri Sahiroh, Samakhatus Sa’adah, Umi Sifa Alfiyah Suci Novitasari Sulisti, Wahyu Supripyanto, Edy Supriyadi Supriyadi Sutisna Sutisna Syarifah, Ratna Dewi Trianti, Nuri Wenny Maulina, Wenny Wibawa Wibawa, Wibawa Wicaksono, Angga Widiasih Yuliana Yuliana

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