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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.
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.    
Sensitive Magnetic Field Sensor Based on Compensated Double Pick Up Coil Purnama, Budi; Suharyana, Suharyana; Sutomo, Artono Dwijo
IPTEK The Journal for Technology and Science Vol 23, No 1 (2012)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v23i1.16

Abstract

Sensitive magnetic field sensor based on compensated double pick up coil has been developed. In order to confirm sensitifity of modified design, experiment carried out in two steps. Firstly, sensitify of conventional design is clarified. Here pick up coil as an active sensor and solenoid as an exitation coil is separately made. Secondly, modified sensor of integrated configuration is developed. Here for both active flux gate sensor and the exitation coil is made in same one core magnetic. Ferrite and standar foil soft magnetic is utilized in this experiment. In attention, frequency of 50 Hz is used for the whole experimens. A result showed that sensitvity of the integrated configuration sensor is much larger than conventional one. Then, power consume of the integrated flux gate sensor is much lower than conventional. Finally, a range measurement of the integrated configuration sensor can be realized less than 20 T which potential may perhaps sense a change of natural local magnetic field.
Comparison of Ni0.6Co0.4Fe2O4 and NiFe2O4 Nanoparticles for Magnetic Characteristics, Synthesized Using Co-Precipitation Method Utari, Utari; Dasi, Yeni Herlina K.; Purnama, Budi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): IJAP Volume 12 ISSUE 01 YEAR 2022
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.59191

Abstract

Comparison of nickel Ni0.6Co0.4Fe2O4   and NiFe2O4 were studied. The co-precipitation method was performed for the whole sample. After annealing of 600°C for 4 hours, the nanoparticles samples evaluated their structural properties by using Fourier Transform Infra-Red (FTIR) and X-Ray Diffraction (XRD). The XRD pattern confirms that the whole samples have the crystalline structure of the face-centered cubic (fcc) inverse spinel. Furthermore, the lattice and crystallite size of NiFe2O4 increased when added Co2+. The FTIR spectrum showed two prominent absorption bands, i.e., at around k of 358 cm-1 and 588 cm-1, where metals at tetrahedral and octahedral sites reflect intrinsic vibrations, respectively.  Finally, the decrease of saturated magnetization MS from 22.2 emu/g and 9.92 emu/g replacement of Co2+ cation with Ni2+.