Magnetic switching probability of perpendicularly magnetized nano-dot

Wibowo, Nur Aji; Trihandaru, Suryasatriya

doi:10.1088/1742-6596/776/1/012027

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Lebar keduanya, pulsa termal dan pulsa medan magnet, masingmasing sekitar 2 ns dan 4 ns untuk memastikan bahwa kecepatan baca-tulis data dalam orde ratusan Mbit/s. Untuk menyelidiki probabilitas pembalikan pada suhu tinggi, efek stokastik sebagai dampak penggunaan medan panas dipertimbangkan dalam penghitungan (Wibowo & Trihandaru, 2016). Perhitungan dilakukan pada lebih dari dua puluh berbagai angka acak untuk mendapatkan probabilitas pembalikan.…”

Section: Hasil Dan Diskusiunclassified

Dinamika Pembalikan Magnetisasi Nanoblock Berbasis Kobalt Teredam Kuat di Bawah Stimulasi Medan Panas

Wibowo

Riyanto²

2023

juses

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Dinamika pembalikan magnetisasi pada nanoblock berbasis kobalt teredam kuat yang distimulasi oleh pemanasan pulsa telah dieksplorasi secara numerik untuk model parallelepiped dengan ukuran 50×50×20 nm3. Pengaturan simulasi diimplementasikan untuk mengevaluasi dua parameter penting dalam perekaman magnetik dengan bantuan panas, yaitu stabilitas termal, dan konsumsi medan tulis. Stabilitas termal diukur melalui medan magnet induksi yang meningkat secara linear hingga 2 Tesla selama 2,5 ns pada kesetimbangan termal terhadap lingkungan. Dalam simulasi sistem dengan stimulasi medan panas, konsumsi medan tulis diselidiki menggunakan dua jenis pulsa, yaitu medan magnet, dan pulsa medan termal. Simulasi ini didasarkan pada persamaan Landau-Lifshift-Gilbert yang memasukkan teorema disipasi fluktuasi dalam menghitung efek fluktuasi termal. Selain itu, parameter-parameter material yang tergantung suhu, yaitu saturasi magnetik, anisotropi magnetik, dan interaksi pertukaran, juga diperhitungkan. Sebagai hasilnya, nanoblock berbasis kobalt yang teredam kuat memiliki penghalang energi magnetik yang tinggi untuk mencegah batasan superparamagnetik. Selain itu, medan penulisan dapat dikontrol melalui pengaturan periode pemanasan, dan juga melalui manipulasi sifat magnetik seperti redaman magnetik intrinsik.

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Section: Hasil Dan Diskusiunclassified

Dinamika Pembalikan Magnetisasi Nanoblock Berbasis Kobalt Teredam Kuat di Bawah Stimulasi Medan Panas

Wibowo

Riyanto²

2023

juses

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“…However, the most fundamental problem in the develop-ment of current TIMS technology is an acceptable understanding of the fundamental behavior and optimization of magnetization dynamics of storage units during heating and cooling processes [10,11] because the use of thermal fields potentially leads to a mess system. The disorder of heat-induced system behavior causes many possible magnetization reversal modes that have an impact on the writing-field magnitude.…”

Section: Introductionmentioning

confidence: 99%

Performance of Magnetic Switching at the Recording Temperature in Perpendicularly Magnetized Nanodots

Wibowo¹,

Nugroho²,

Riyanto³

2019

JMAG

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A temperature-dependent micromagnetic study has been conducted to examine the spin dynamics of the perpendicularly magnetized nanodot in a thermally induced magnetic switching (TIMS) scheme. The magnetic parameters used in this study represent the properties of BaFe. The impact of writing-temperatures below the Curie point on the magnetization reversal characteristic of nanodot with three damping levels, which related to the minimum writing-field as well as the zero-field-switching probability, were discussed systematically. The spins configuration of the nanodot was also presented to visualize the modes of the magnetization switching. The simulation reveals that the writing-field decreases concerning with the writing-temperature and reaches its lowest value at the temperature of 0.4 % below its Curie point. During the heating phase, the mechanism of demagnetization is coupled with the writing-temperature. Meanwhile, the magnetic damping takes over the role in the magnetic switching mechanism during the freezing.

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Thermally Activated Magnetic Switching Mode for Various Thicknesses of Perpendicularly Ferromagnetic Nano-dot

2019

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Background: Even applying thermal pulse has been succeeded to reduce the coercivity through randomization the magnetization in such a way stimulate the magnetic reversion, the efficiency of magnetic switching field consumption in writing process still turns out to be an exciting research field to implement the HAMR technology. One of the remarkable geometric properties of HAMR storage media that can be correlated to the writing field reduction issue is the nano-dot thickness. Furthermore, thermal fluctuation causes the magnetization switching process to be probabilistic. This magnetic switching probability determines the magnitude of the writing field. This paper aims to investigate the impact of changes in media thickness on the magnetization process in particular at high temperatures numerically. Methods: Nano-dot was modeled as a parallelepiped with uniaxial anisotropy which was regarded as a magnetically isolated system where no disturbance field of neighboring nano-dots. Simulation arrangements were implemented to evaluate the two viewpoints in the current heat-assisted magnetic recording, either coercivity, as well as writing field consume. Coercivity was gauged by inducing a magnetic field which linearly increased up to 2 Tesla for 2.5 ns at thermal equilibrium to the surrounding. In evaluating writing field consume, thermal field pulse which just below the Curie temperature was generated while the magnetic field inducing the nano-dot. These schemes investigations were based on the Landau-Lifshift- Gilbert equation which accommodates the fluctuation-dissipation theorem in calculating thermal fluctuation effect. Also, temperature dependent material parameters such as magnetic saturation, magnetic anisotropy, and exchange interaction, were taken into account. Results: At room temperature, the coercive and nucleation fields are highly sensitive to the nano-dot thickness. Under thermal assistance, the writing field for 10 nm and 100 nm of the chosen thicknesses are 0.110 T and 0.125 T respectively. These writing grades are significantly lower than the coercivity of the media. For both thicknesses, zero field magnetization reversal phenomena are observed as indicated by the existences of the switching probabilities at H = 0. Conclusion: This numerical study showed that using the heating assistance close to the Curie point, nanodots with the chosen thicknesses and magnetic parameters were probably to be magnetized even no driven magnetic field. Along with this result, magnetic field induction which required to utterly magnetizing was only in the sub-Tesla - about a tenth of the coercive field. During magnetization processes under thermal assistance, randomization of magnetic moments initiated the switching dynamic before the domain wall was nucleated and propagated to reach a single magnetized domain.

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Magnetic switching probability of perpendicularly magnetized nano-dot

Cited by 3 publications

References 3 publications

Dinamika Pembalikan Magnetisasi Nanoblock Berbasis Kobalt Teredam Kuat di Bawah Stimulasi Medan Panas

Dinamika Pembalikan Magnetisasi Nanoblock Berbasis Kobalt Teredam Kuat di Bawah Stimulasi Medan Panas

Performance of Magnetic Switching at the Recording Temperature in Perpendicularly Magnetized Nanodots

Thermally Activated Magnetic Switching Mode for Various Thicknesses of Perpendicularly Ferromagnetic Nano-dot

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