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Charge Carrier Mobility Analysis of Chlorophyll Thin Film Spirulina sp Produced by Spin Coating Mustain, Muhamad; Sulistyana, Defi; U, Utari; Purnama, Budi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 01 (2014): IJAP Volume 04 Issue 01 Year 2014
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i01.1158

Abstract

Analysis of carrier charge mobility of Spirulina sp thin films produced by spin coating havebeen conducted. Measurement of carrier charge mobility has been done by I-V method.Mobility of carrier charge decreased with an increased of the layer number. It indicates that athreshold value of carrier charge of population number over flow on conduction band.
Effect of bismuth substitution on magnetic properties of CoFe2O4 nanoparticles: Study of synthesize using coprecipitation method Saputro, Didik Eko; Utari, Utari; Purnama, Budi
Journal of Physics: Theories and Applications Vol 3, No 1 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v3i1.31764

Abstract

Abstract: The effect of bismuth ion substitution on the magnetic properties of cobalt ferrite nanoparticles was identified in this study. This method used in this study was coprecipitation method using 0.1 bismuth ion concentration. The results on hysteresis loop showed that the saturation magnetization of cobalt ferrite nanoparticles decreased with the substitution of bismuth ions, but the coercive field experienced the opposite. Saturation magnetization decreased from 57.97 to 51.19 emu / g, while coercive fields increased from 0.64 to 0.84 kOe.
Kajian Simulasi Mikromagnetik: Ketergantungan Medan Koersif dengan Besaran Intrinsik Nano-Dot Magnetik dengan Anisotropi Tegak Lurus Purnama, Budi; Ismail, Ismail; Suharyana, Suharyana
Jurnal Fisika dan Aplikasinya Vol 9, No 1 (2013)
Publisher : Jurnal Fisika dan Aplikasinya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (504.519 KB) | DOI: 10.12962/j24604682.v9i1.835

Abstract

Kajian simulasi mikromagnetik magnetisasi reversal pada nano-dot magnetik dengan anisotropi tegak lurus telah dilakukan dengan menyelesaikan persamaan Landau-Lifshitz-Gilbert. Model yang disimulasikan nano-dot bahan magnetik pada unit sel Heat Assisted Magnetic Recording (HAMR) dengan dimensi 50 nm × 50 nm × 20 nm, 4MS = 2500 gauss, TC = 373 K dan konstanta anisotropi K? = 5.105 erg/cm3. Simulasi ini dilakukan untuk mengetahui faktor-faktor fisis yang berpengaruh pada koersifitas dari pengamatan proses magnetisasi reversal. Hasil simulasi menunjukkan medan koersif meningkat sebesar 18% dengan penurunan redaman Gilbert dari = 1 hingga = 0,3. Akhirnya, peningkatan medan koesif juga teramati sebesar 32,7% dengan penurunan konstanta exchange stiffness dari A = 1.10−6 erg/cm hingga A = 1.10−7 erg/cm.
Studi pendahuluan biosensor berbasis magneto-impedansi Nuryani, N; Purnama, Budi; prastyo, Wahyu eko
Jurnal Fisika dan Aplikasinya Vol 14, No 2 (2018)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1043.751 KB) | DOI: 10.12962/j24604682.v14i2.3562

Abstract

Bio-impedansi sensor mulltilayer [NiFe(800)/Cu(300)]4 telah berhasil dibuat dengan metode elektro-deposisi. Respon bio-magneto-impedansi didefinisikan sebagai perubahan impedansi akibat medan terpasang (MI) dengan dan tanpa sampel daging. Profil respon bio-MI sampel daging sapi memiliki bentuk kurva yang setipe dengan kurva rasio magneto-impedansi dan bergantung pada frekuensi pengukuran. Respon bio-MI padapenelitian ini terbesar 0,7% pada frekuensi 100 kHz.
PENGARUH JUMLAH MULTILAPISAN [NI80FE20/CU]N TERHADAP EFEK MAGNETOIMPEDANSI PADA KAWAT CU HASIL ELEKTRODEPOSISI Ismail, Ismail; Wicaksono, B. Anggit; Nuryani, Nuryani; Purnama, Budi
Jurnal Materi dan Pembelajaran Fisika Vol 5, No 2 (2015): Jurnal Materi dan Pembelajaran Fisika
Publisher : Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (427.297 KB)

Abstract

Efek magnetoimpedansi pada kawat tembaga yang dideposisi dengan lapisan Ni80Fe20/Cu telah berhasil diamati. Pengukuran dilakukan pada frekuensi rendah (20 ? 100 kHz) dengan variasi jumlah lapisan Ni80Fe20/Cu. Hasil pengukuran menunjukkan rasio magnetoimpedansi meningkat secara signifikan dari 6,4% menjadi 50% dengan peningkatan jumlah lapisan dari   N = 1 hingga N = 3. Hasil pengukuran juga menunjukkan sensitifitas terhadap medan juga meningkat 20 kali lipat dengan peningkatan jumlah lapisan Ni80Fe20/Cu.    
Surface Morphology of Fe(III)-Porphyrin Thin Layers as Characterized by Atomic Force Microscopy Utari, Utari; Kusumandari, Kusumandari; Purnama, Budi; Mudasir, Mudasir; Abraha, Kamsul
Indonesian Journal of Chemistry Vol 16, No 3 (2016)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (356.597 KB) | DOI: 10.22146/ijc.21136

Abstract

Surface morphology of Fe(III)–porphyrin thin layers was studied using atomic force microscopy. The thin layer samples used in these experiments were deposited by spin coating methods on indium–tin-oxide substrates at room temperature under atmospheric conditions. Variations of thin layer of Fe(III)-porphyrin were done by modifying the rotational speed and the concentration of the solution. The experimental results demonstrated that the Fe(III)–porphyrin layers were observed as discrete nanomolecular islands. Both the number of nano-islands and thickness of the layer increased significantly with increasing concentration. A layer thickness of 15 nm was obtained for low concentrations of 0.00153 M and become 25 nm for dense concentrations of 0.153 M. Conversely, the higher number of islands were deposited on the surface of the substrate at a lower rotational speed.
Efek Magneto-Impedansi Frekuensi Rendah pada Non Litografi Multilayer [NiFe/Cu]4 Prastyo, Wahyu Eko; Purnama, Budi; Nuryani, Nuryani
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 16, No 1 (2019): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v16i1.5004

Abstract

The magneto-impedance effect in multilayer system of [NiFe/Cu]4 present at this paper. The samples prepare by electrodepositin methods on a non-lithography pattern of PCB Cu substrate. The NiFe and Cu layer sequency produce to obtain a multilayer system [NiFe/Cu]4. Thereafter, sample evaluate magnetic property by using vibrating sample magnetometer (VSM).  Finally, sample evaluate a magneto-impedance response by total electrical impedance measure under various external magnetic field.  Typical magneto-impedance ratio of 7,56% indicate the sample can to apply as magnetic sensor at low frequency region.
Modification of Sensor Sensitivity of Magneto-Impedancy on Multilayer [Ni80Fe20/Cu]N as result of Electro-Deposition Wicaksono, B. Anggit; Nahrun, Ahmad Asrori; Nuryani, Nuryani; Purnama, Budi
Jurnal ILMU DASAR Vol 17 No 1 (2016)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.77 KB) | DOI: 10.19184/jid.v17i1.2669

Abstract

Multilayer sensor sensitivity [Ni80Fe20/Cu]N as results of electro-deposition on Cu wire has been modified by several variables; namely (i) the frequency of measurement, (ii) the number of iteration N on the system [Ni80Fe20/Cu]N, and (iii) the thickness of the spacer layer of Cu. If applied as a magnetic sensor, the measured sensor sensitivity can be calculated using the formula; ξ = 2 [(ΔZ/Z)max]/ΔH. The results of the sensitivity calculations show that the increase in the ratio of magneto-impedance directly proportional to the sensitivity of the sensor. To modify the frequency of the sample [Ni80Fe20(800nm)/Cu(300 nm)]3, the measurement sensitivity increases with increases in frequency. And the highest sensitivity is obtained 8.91%/ mT at a frequency of 100 kHz. Similar results were obtained in the variation of the number of iteration N multilayer [Ni80Fe20 (800 nm) / Cu (300 nm)]N. Senitifitas measurements at a frequency of 100 kHz and the highest number of iteration (N=5) obtained the highest sensitivity, which is 26.63%/mT. Furthermore, the sensitivity of the sensor showed a tendency to decrease with the increase in the thickness of the spacer Cu in multilayer [Ni80Fe20 (800 nm)/Cu (y nm)]3. Finally, the highest sensitivity was obtained 53.75% / mT for most thin thickness of the spacer Cu (y = 200 nm) which is the highest value in the whole of this experimentKeywords: Sensor Sensitivity, Ni80Fe20 , Frequency Measurement, Iteration Number, Spacer Cu
Demonstration of Magneto-Impedance Sensor on Multilayer Coil [Ni80Fe20/Cu]N Result of Electro-Deposition Nahrun, Ahmad Asrori; Wicaksono, B. Anggit; Ismail, Ismail; Nuryani, Nuryani; Purnama, Budi
Jurnal ILMU DASAR Vol 17 No 2 (2016)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.191 KB) | DOI: 10.19184/jid.v17i2.2688

Abstract

Demonstration performance magneto - impedance sensor on the coil wire multilayer [ Ni80Fe20/Cu ]N electro - deposition results presented in this paper . At first multilayer [ Ni80Fe20/Cu ]N deposited on a Cu wire into a coil and then the sample is modified by the number of windings 2 and 4. The results of impedance measurements under the influence of the magnetic field shows that the magneto - impedance ratio increases with the increase in the number of windings. Magneto - impedance ratio changed from 15 % to 17.4% with a change in the number of windings of 2 to 4. The fact these results allegedly contributed their self-inductance value of this magnitude greater contribution to the increase in the number of windings.Keywords: Magneto - impedance sensor, electro-deposition , multilayer coils [Ni80Fe20/Cu]N
Preliminary Investigation: StearidoStudi Pengaruh Pengadukan dan Tanpa Pengadukan Larutan Elektrolit Terhadap Struktur Kristal, Morfologi dan Rasio Magnetoresistansi Lapisan Tipis Paduan NiFe Hasil Elektrodeposisinic Acid Production by Genetically Modifie Nurosyid, Fahru; Nuryani, Nuryani; Purnama, Budi; Asry Ayuni, Luthfiana
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (343.578 KB)

Abstract

Ni-Fe alloy thin film on Cu substrate by electro-deposition method has been made without as well as with agitation of 300 rpm for a 3 minutes deposition time and potential of 3 Volt. The characterizations consist of crystal structure test by X-Ray Diffraction method, morphology and composition test by SEM/EDX and magnetoresistance measurement with two-point probes equipment. Result of the XRD test showed that the growth of crystal structure was in the same orientation on 111, 200, 220, 311with structure of fcc. Morphology test showed that the structural images of Ni-Fe surface thin film on agitation became flat and had less grain size. The composition test results showed that composition with agitation closely Ni80Fe20 (permalloy) was 87.51% for Ni and 12.49% for Fe. The magnetoresistance measurement was less with the agitation treatment i.e. without agitation was 9.1 % and with agitation was 1.9 %.