Prospects for bit patterned media for high-density magnetic recording

Kikitsu, Akira

doi:10.1016/j.jmmm.2008.05.039

Cited by 77 publications

(35 citation statements)

References 14 publications

(18 reference statements)

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“…These and other nanoscale properties of ferromagnetic nanoparticles make them very attractive for applications, e.g., in high density data storage [8][9][10], spintronic devices [11][12][13], and biomedical engineering [14][15][16][17]. If the magnetic state of nanoparticles is controlled by a time-dependent external magnetic field, then nanoparticles absorb energy from the field and heat up.…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation in single-domain ferromagnetic nanoparticles: Dynamical approach

et al. 2015

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We study, both analytically and numerically, the phenomenon of energy dissipation in single-domain ferromagnetic nanoparticles driven by an alternating magnetic field. Our interest is focused on the power loss resulting from the Landau-Lifshitz-Gilbert equation, which describes the precessional motion of the nanoparticle magnetic moment. We determine the power loss as a function of the field amplitude and frequency and analyze its dependence on different regimes of forced precession induced by circularly and linearly polarized magnetic fields. The conditions to maximize the nanoparticle heating are also analyzed.

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Section: Introductionmentioning

confidence: 99%

Energy dissipation in single-domain ferromagnetic nanoparticles: Dynamical approach

et al. 2015

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“…The main effect and two-interaction effect of the design parameters can be evaluated based on the responses of factorial runs (1)(2)(3)(4)(5)(6)(7)(8), and the quadratic effect can be evaluated based on the axial and center runs (9)(10)(11)(12)(13)(14)(15). Strength of each effect can be indicated by the percentagewise absolute value of the coefficient in RSM model, as shown in Figure 4.…”

Section: Simulation Design Imentioning

confidence: 99%

“…In recent years, several new methods and techniques have been proposed to manage this problem, such as heat-assisted magnetic recording (HAMR) [2], microwave-assisted magnetic recording (MAMR) [3,4], shingled magnetic recording (SMR) [5,6], and bit-patterned media recording (BPM) [7,8]. In the BPM scheme, the data are stored in patterned magnetic islands instead of grain clusters in conventional continuous media to achieve higher SNR and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Writing Field Analysis for Shingled Bit-Patterned Magnetic Recording

Liu

Kang

et al. 2017

Journal of Nanomaterials

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A novel method utilizing response surface methodology (RSM) is proposed for effective analysis of the combined influence of writing head geometry and media properties on writing field performance. The method comprises two main modules: (1) a parametric writing head model based on finite element electromagnetic field analysis and (2) an effective writing field gradient model based on RSM. Using the method proposed, the writing performance of an asymmetrically shielded writing head for shingled magnetic recording on bit-patterned media (SMR-BPM) is analyzed. The results show that the shielding trailing gap and medium coercivity primarily impact the effective writing field (EWF) gradient and that the shielding side gap has a secondary impact. More importantly, the analysis shows a strong interaction effect between the influences of writing head geometry and medium coercivity on the EWF gradient, which indicates the need for inclusive design.

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“…Decreasing the number of HDDs by increasing their magnetic storage density can be a simple and efficient means to mitigate increased power consumption. Ferromagnetic (FM) thin films prepared using nanofabrication techniques can be used for high-density magnetic data storage [1][2][3] and spintronic devices [4].…”

Section: Introductionmentioning

confidence: 99%

“…Bit-patterned media (BPM) is a candidate for the creation of ultra-high-density magnetic data storage devices [1,2]. BPM consist of multiple phases, which include the FM phase (dots) characterized by a high uniaxial magnetic anisotropy along with, in principle, diamagnetic, antiferromagnetic (AF), and paramagnetic (PM) phases.…”

Section: Introductionmentioning

confidence: 99%

Structural Dependent Ferromagnetic-Nonmagnetic Phase Change in FePtRu Films

Hasegawa

Ito

2017

Advances in Materials Science and Engineering

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Herein, we studied correlations between crystal structures and magnetic properties of FePt 1− Ru films. At room temperature, the chemical disordered 1 films with 0 ≤ < 0.20 and 0.20 ≤ ≤ 1.00 exhibited ferromagnetic properties and paramagnetic properties, respectively. Curie temperature of the disordered film with = 0.30 was 200 K. In contrast, the ordered 1 0 films had ferromagnetic properties in a wider range of 0 ≤ < 0.80 with the magnetic easy-axis perpendicular to the film plane. For 0 ≤ ≤ 0.50, with the ordered structure, the films had high magnetization and high uniaxial magnetic anisotropy of over 10 7 erg cm −3 . For = 0.60-0.70 with the ordered structure, a temperature-dependent magnetic phase transition appeared, and magnetization reached its maximum value at around 200 K. Using this material system, we proposed a nanopatterning method involving a ferromagnetic-paramagnetic phase change due to the ordered-disordered structural transformation.

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Prospects for bit patterned media for high-density magnetic recording

Cited by 77 publications

References 14 publications

Energy dissipation in single-domain ferromagnetic nanoparticles: Dynamical approach

Energy dissipation in single-domain ferromagnetic nanoparticles: Dynamical approach

Writing Field Analysis for Shingled Bit-Patterned Magnetic Recording

Structural Dependent Ferromagnetic-Nonmagnetic Phase Change in FePtRu Films

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