Approximate Three-Dimensional Head Fields for Perpendicular Magnetic Recording

Wilton, D.T.; McKirdy, D.Mc.A.; Shute, H.A.; Miles, J.J.; Mapps, D.J.

doi:10.1109/tmag.2003.821132

Cited by 22 publications

(6 citation statements)

References 21 publications

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“…Let us introduce the coordinate system to be used throughout this paper, in which z axis is parallel to the anisotropy axis in the media, with positive direction aligned with the initial (non-reversed) orientation of the magnetization. The DC wrier field 19 (Fig. 1) in the gap is applied along yz plane, with a negative projection on z axis.…”

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confidence: 99%

Physical principles of microwave assisted magnetic recording

Rivkin¹,

Benakli²,

Tabat³

et al. 2014

Journal of Applied Physics

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While the basic physics of Microwave Assisted Magnetization Reversal (MAMR) phenomenon is well established both theoretically and experimentally, its application in a practical magnetic recording environment was so far studied primarily with the help of micromagnetic recording models. In this work, we instead attempt to use analytical formulation and simple numerical models to understand the main challenges as well as benefits that are associated with such a system. It appears that the main difference between the previously introduced theory [G. Bertotti et al., Phys. Rev. Lett. 86, 724 (2001); K. Rivkin et al., Appl. Phys. Lett. 92, 153104 (2008); S. Okamoto et al., J. Appl. Phys. 107, 123914 (2010).] and recording environment is that both the RF and DC magnetic fields are applied at a substantial angle to the anisotropy axis. While the associated symmetry breaking prevents one from describing the reversal process explicitly, it is possible to approximate the solutions well enough to satisfactorily match numerical models both in the case of wire and Spin Torque Oscillator generated RF fields. This approach allows for physical explanation of various effects associated with MAMR such as high gradient of writeable anisotropy and reduction of track width, and offers a clear guidance regarding future optimization of MAMR recording.

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confidence: 99%

Physical principles of microwave assisted magnetic recording

Rivkin¹,

Benakli²,

Tabat³

et al. 2014

Journal of Applied Physics

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“…1(b) and Fig. 3 h(t 1 , t 2 ), can be obtained by using the method proposed in [15]. In this paper, we assume the read-head response to be a truncated 2-D Gaussian pulse which spans 3 × 3 cells.…”

Section: Readback Processmentioning

confidence: 99%

Detection for two-dimensional magnetic recording systems

Khatami

Vasić

2013

2013 International Conference on Computing, Networking and Communications (ICNC)

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Two dimensional magnetic recording (TDMR) is a novel scheme which envisions reaching 10 Tb/in 2 density in magnetic recording systems. The feasibility of this density relies largely on sophisticated two-dimensional (2-D) signal processing algorithms. This paper gives a survey on TDMR channel models and 2-D detectors. Our discussion on channel models places an special emphasis on the suitability of the read channel models for the purpose of detector design. Furthermore, a comprehensive review on 2-D detection is given focusing on compatibility of the detectors for the TDMR channel models.

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“…A large number of analytical models for the magnetic read back signal have been developed in the past for longitudinal and perpendicular magnetic recording (Valcu and Bertram 2002;Roscamp et al 2002;Smith 1993;Wood and Wilton 2008;Shute et al 2006;Chai et al 2006;Suzuki et al 2006;Wilton et al 2004;Mallinson and Bertram 1984;Radhakrishnan et al 2007;Bertram 1994;Khizroev and Litvinov 2004;Richter 1999;Bertram 1994, 1996;Nishida 2001, 2003). Initially, the ''on-track'' response was approximated in 2-D by neglecting off-track effects and approximating an isolated bit transition which yields a bell-shaped curve for longitudinal recording and a di-bit curve for perpendicular recording (Richter 1999).…”

Section: Introductionmentioning

confidence: 99%

“…A commonly used technique is based on the principle of reciprocity as applied in (Roscamp et al 2002;Smith 1993;Chai et al 2006;Yuan and Bertram 1994;Yuan and Bertram 1996) or Fourier components (Shute et al 2006;Suzuki et al 2006;Nishida 2001, 2003). An excellent overview of previously developed models is given in Wilton et al (2004). In Wilton et al (2004), the read back signal is approximated by considering various magnetic potentials.…”

Section: Introductionmentioning

confidence: 99%

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Analytical read back signal modeling in magnetic recording

Boettcher

Lacey²,

Li³

et al. 2011

Microsyst Technol

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An analytical model for the read back signal is derived for perpendicular and longitudinal magnetic recording. The model captures the contribution of a single bit rather than the contribution of a bit transition which makes it applicable to patterned media as well as continuous media. It is based on the law of Biot-Savart and separates the contribution of the magnetic media from the head sensitivity function.

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Approximate Three-Dimensional Head Fields for Perpendicular Magnetic Recording

Cited by 22 publications

References 21 publications

Physical principles of microwave assisted magnetic recording

Physical principles of microwave assisted magnetic recording

Detection for two-dimensional magnetic recording systems

Analytical read back signal modeling in magnetic recording

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