Read and write processes, and head technology for perpendicular recording

Gao, Kai-Zhong; Heinonen, Olle; Chen, Yonghua

doi:10.1016/j.jmmm.2008.05.025

Cited by 34 publications

(13 citation statements)

References 59 publications

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“…Journal of Nanomaterials Journal of Nanomaterials where is the EWF gradient obtained by (1), is the design parameter, is the fitting error, is the number of parameters under investigation, and 0 , , , and are the coefficients that need to be solved. A typical CCD includes 2 factorial runs, 2 axial runs, and center runs to identify all the coefficients in the polynomial.…”

Section: Effective Writing Field and Gradientmentioning

confidence: 99%

“…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%

“…The development of perpendicular magnetic recording is restricted by the famous trilemma caused by the superparamagnetic limit: thermal stability, grain size, and writing ability conflict while the areal density is increasing [1]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effective Writing Field and Gradientmentioning

confidence: 99%

Section: Simulation Design Imentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Writing Field Analysis for Shingled Bit-Patterned Magnetic Recording

Liu

Kang

et al. 2017

Journal of Nanomaterials

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“…In order to generate a strong and localized RF magnetic field, and to enhance the spatial resolution of this microscope, a magnetic writer is utilized in our experiment. Taking advantage of magnetic write head technology with write-gap widths on the order of 100 nm [5], an RF field on the scale of 1 Tesla [6] with sub-micron spatial extent [7] can be created. In this work, we integrate the magnetic writer probe into our microwave microscope and demonstrate that this probe can develop a nonlinear Meissner effect signal from several kinds of superconductors such as MgB 2 and Tl 2 Ba 2 CaCu 2 O 8 (TBCCO).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Near-Field Microwave Microscope for RF Defect Localization in Superconductors

Tai

Zhuang

et al. 2011

IEEE Trans. Appl. Supercond.

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Niobium-based Superconducting Radio Frequency (SRF) cavity performance is sensitive to localized defects that give rise to quenches at high accelerating gradients. In order to identify these material defects on bulk Nb surfaces at their operating frequency and temperature, it is important to develop a new kind of wide bandwidth microwave microscopy with localized and strong RF magnetic fields. By taking advantage of write head technology widely used in the magnetic recording industry, one can obtain ∼200 mT RF magnetic fields, which is on the order of the thermodynamic critical field of Nb, on submicron length scales on the surface of the superconductor. We have successfully induced the nonlinear Meissner effect via this magnetic write head probe on a variety of superconductors. This design should have a high spatial resolution and is a promising candidate to find localized defects on bulk Nb surfaces and thin film coatings of interest for accelerator applications.Index Terms-Harmonic generation, microwave microscope, magnetic write head, nonlinear Meissner effect, near-field, RF superconductivity.

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“…As for ultrahigh density PMR recording heads, the key requirements for the head design are to optimise the AC magnetic field distribution and the gradient profiles in both down-track and cross-track directions. 1,2 Recently, many researchers have studied the magnetic field characteristics of recording heads using the finite element method (FEM) and micromagnetic models, 3,4 with some experimental studies based on spinstand measurements. However, it is difficult to characterise the AC magnetic field distribution of recording heads under the real working conditions of hard disk drives.…”

mentioning

confidence: 99%

Stroboscopic imaging of an alternating magnetic field from a perpendicular magnetic recording head by frequency-modulated magnetic force microscopy

Hatakeyama

Egawa

et al. 2012

Applied Physics Letters

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High frequency magnetic field imaging by frequency modulated magnetic force microscopy J. Appl. Phys. 107, 09D309 (2010); 10.1063/1.3368706High resolution magnetic imaging of perpendicular magnetic recording head using frequency-modulated magnetic force microscopy with a hard magnetic tip A comparative study of write field distribution of trailing-edge shielded and unshielded perpendicular write heads by quantitative magnetic force microscopy

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Read and write processes, and head technology for perpendicular recording

Cited by 34 publications

References 59 publications

Writing Field Analysis for Shingled Bit-Patterned Magnetic Recording

Writing Field Analysis for Shingled Bit-Patterned Magnetic Recording

Nonlinear Near-Field Microwave Microscope for RF Defect Localization in Superconductors

Stroboscopic imaging of an alternating magnetic field from a perpendicular magnetic recording head by frequency-modulated magnetic force microscopy

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