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All Journal Spektra: Jurnal Fisika dan Aplikasinya PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
W. Nursiyanto
Program Studi Teknik Mesin, Universitas Pancasila, Srengseng Sawah, Jagakarsa, Jakarta 12640
Aerospace Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics Other

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AMPLITUDO OSILASI POSISI DOMAIN WALL BAHAN FEROMAGNETIK NANOWIRE BERKONTRIKSI SEGITIGA KETIKA DIBERI MEDAN LUAR AC DENGAN AMPLITUDO 2 MILITESLA W. Nursiyanto; B. Soegijono; E. Djatmiko
Spektra: Jurnal Fisika dan Aplikasinya Vol 1 No 1 (2016): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 1 Nomor 1, Agustus 2016
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (552.452 KB) | DOI: 10.21009/SPEKTRA.011.13

Abstract

Abstrak Banyak para peneliti menyoroti bahan feromagnetik bentuk nanowire dalam kaitan dengan aplikasi magnetic storage, sebagai penyimpan data berbasis magnet. Oleh karena itu, telah dilakukan pengamatan amplitudo osilasi domain wall (DW) pada bahan feromagnetik nanowire berukuran 2000 × 200 × 5 nm3 dengan kontriksi (notch) simetri berbentuk segitiga yang diberi medan magnet luar AC dengan amplitudo 2,0 mT dan variasi frekuensi dari 0,3 GHz sampai 2,0 GHz. Diperoleh data yang berasal dari operasi simulasi mikromagnetik dengan menggunakan perangkat lunak bernama “Object Oriented Micromagnetic Framework” (OOMMF) berdasarkan persamaan dinamika spin magnet Landau-Lifshitz-Gilbert (LLG). Hasil pengolahan data pengamatan memperlihatkan bahwa osilasi DW memiliki frekuensi yang sama dengan frekuensi medan magnet luar yang diberikan. Posisi DW untuk bahan Fe tidak mengalami pergeseran dan menghasilkan nilai amplitudo DW yang stabil. Sedangkan bahan Ni dan Co mengalami pergeseran dari posisi ekuilibrium yaitu ke arah sumbu x-positip dan nilai amplitudo DW semakin kecil dengan meningkatnya frekuensi medan luar. Kata-kata kunci: feromagnetik, nanowire, notch, osilasi, amplitudo. Abstract Many researchers interested to know about the nanowire ferromagnetic material for the application of magnetic storage as magnet-based data storage. Therefore, it has been observed amplitude of the domain wall oscillation in the nanowire ferromagnetic material by dimension of 2000 × 200 × 5 nm3 have given the symmetrical triangular notch in the center. After that, external magnetic field with amplitude of 2.0 mT and variation of frequency from 0.3 GHz to 2.0 GHz given to the sample. The data get from micro magnetic simulation by using software called "Object Oriented Micro Magnetic Framework" (OOMMF) which it working based on magnetic spin dynamics equation of Landau-Lifshitz-Gilbert (LLG). The results showed that oscillations DW have same number with frequency of the external magnetic field. For Fe material, DW position does not shift from the position of equilibrium and produce amplitude of DW almost stable. While for the material Ni and Co, the result was different showed that position of DW have shifted to the x-axis positive and have amplitude tend smaller when the frequency of the external field increased. Keywords: ferromagnetic, nanowire, notch, oscillation, amplitude.
ANALISIS DIAMETER KRITIS DAN SUHU CURIE BAHAN PARMALLOY FECOB BERBENTUK BOLA-NANO SERTA PENGARUH TEMPERATUR (HEAT ASSISTED) DENGAN MENGGUNAKAN PROGRAM SIMULASI MIKROMAGNETIK NMAG DAN VAMPIRE W. Nursiyanto; L. Rohman; A. Eko M
Spektra: Jurnal Fisika dan Aplikasinya Vol 2 No 3 (2017): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 2 Nomor 3, Desember 2017
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (893.301 KB) | DOI: 10.21009/SPEKTRA.023.04

Abstract

Abstrak Bahan paduan magnet (parmalloy) FeCoB bersifat magnet kuat karena memiliki koersivitas medan magnetik yang kuat. Dari sifat yang dimiliki ini, FeCoB sangat cocok digunakan sebagai bahan piranti penyimpan data. Namun demikian, bahan parmalloy FeCoB ini akan mengalami perubahan sifat magnetnya ketika mendapat pengaruh temperatur (heat assisted) yang berubah-ubah dan dimensi (diameter bola) yang berbeda. Dengan adanya kondisi tersebut, diperlukan informasi yang cukup dari bahan parmalloy FeCoB agar menjadi efektif dan efisien ketika bahan ini digunakan sebagai bahan dasar hard-disk. Oleh karena itu, dilakukan analisis bahan parmalloy FeCoB yang terdiri dari dimensi diameter yang mempengaruhi perubahan sifat magnet (diameter kritis), suhu Curie akibat perubahan temperatur dan diameter bahan, serta kurva histerisisnya. Penelitian ini dilakukan dengan menggunakan program simulasi mikromagnetik Nmag dan Vampire. Hasil yang didapatkan dari bahan parmalloy FeCoB ini adalah memiliki diameter kritis sebesar 10 nm dan suhu Curie sebesar 700 K. Dari hasil ini dapat disimpulkan bahwa bahan parmalloy FeCoB akan efektif dan efisien sebagai bahan dasar hard-disk bila dimensi diameter yang digunakan di bawah diameteri kritis dan dioperasikan di bawah suhu Curie. Kata-kata kunci: parmalloy, kurva histerisis, suhu Curie, heat assisted. Abstract The magnetic alloy material (parmalloy) FeCoB is strongly magnetic material category because it has strong coercivity. So, FeCoB is suitable for use as data storage device. However, the FeCoB will be changed of its magnetic properties when it used to varying temperatures (heat assisted) and different dimensions (spherical diameter). Therefore, some sufficient information is required from the material when this material is used as a hard-disk base material. An analysis of FeCoB parmalloy material consisting of diameter dimensions influencing the change of magnetic properties (critical diameter), Curie temperature due to changes in temperature and material diameter, and hysteresis curve. This research was using simulation of program micromagnetic are Nmag and Vampire. The results of this research are the critical diameter is 10 nm and value of Curie temperature is 700 K. The conclusion from that results is the material will be effective and efficient as the hard-disk base material when the diameter dimension is used under critical diameter. And it will be operated under Curie temperature. Keywords: parmalloy, hysterisis curve, Curie temperature, heat assisted.
PENGARUH BENTUK NOTCH TERHADAP KURVA HISTERISIS BAHAN FEROMAGNETIK NANOWIRE W. Nursiyanto; B. Soegijono; E. Djatmiko
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (675.93 KB)

Abstract

Spintronic devices and data storage which based on magnetic usually made from material of ferromagnetic nanowire. The shape and size of the hysteresis for a ferromagnetic material have a very important meaning in its application on data storage devices. In this research has investigated hysteresis of a ferromagnetic material (Fe, Ni and Co) nanowire which has been given of doubles notch symmetrically in the middle of the nanowire with the shape are triangles and arches. Dimensional of nanowire size is 2000 × 200 × 5 Nm3 with a cell size of 2.5 × 2.5 × 2.5 Nm3 and the factor of damping is 0.01. The simulation of micromagnetic has been observed with uses software called Object Oriented Framework Micromagnetic (OOMMF) that based on equations of magnetic spin dynamics Landau-Lifshitz-Gilbert (LLG) The initial condition type of structure domain wall (DW) has been given with shape transverse-wall (TW) in the middle of the notch by the configuration of head-to-head. And then nanowire has been given external magnetic field with direction of the x-axis started from -150 mT to 150 mT to get hysterisis curve. The result shows that the shape of notch does not affect the hysteresis curves of ferromag. Keywords: ferromagnetic, nanowire, notch, oscillations, micromagnetic.
Co-Authors A. Eko M B. Soegijono E. Djatmiko L. Rohman