Micromagnetic study of switching speed in perpendicular recording media

Benakli, M.; Torabi, A.F.; Mallary, M.L.; Zhou, Hong; Bertram, H.N.

doi:10.1109/20.950901

Cited by 33 publications

(24 citation statements)

References 5 publications

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“…However consideration of the Stoner-Wohlfarth switching astroid for single domain particles shows that switching in such an oriented system is highly sensitive to off-axis field components-the switching field five degrees off-axis is only 76% of that for fields applied on axis, which suggests that small in-plane fields will significantly change the performance of the system. Studies have predicted that the switching speed of perpendicular media is also strongly dependent upon the applied field angle [1], [2]. In this paper, we investigate the role of off-axis fields and investigate the validity of modeling perpendicular recording using a 1-D model.…”

Section: Introductionmentioning

confidence: 99%

Vector recording in perpendicular media

et al. 2002

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A dynamic hierarchical micromagnetic model has been used to study the effect of off-axis (in-plane) fields upon the recording properties of perpendicular media. The transient and high-frequency switching response are improved. On longer timescales, the susceptibility and squareness are significantly increased. However, transitions written in the medium with a pole head change only slightly when the in-plane field is included. This is because the transition gets written at a point where the head field gradient is lower and because in-plane demagnetizing fields act to reduce the in-plane head field.

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Section: Introductionmentioning

confidence: 99%

Vector recording in perpendicular media

et al. 2002

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“…9 Pt/Co/ Ta and Pt/Co/Ir structures were found to exhibit strong Dzyaloshinskii-Moriya interaction (DMI) for their asymmetric stack structures. 18,19 In addition to the interfacial PMA, the damping constant is an important magnetic parameter in Pt/Co/HM tri-layered structures as it determines the magnetization dynamics, such as the speed of magnetization reversal 20 and domain-wall motion. 21,22 It also affects the thermal fluctuations and noise levels for magnetic read head and sensor applications.…”

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confidence: 99%

Influence of heavy metal materials on magnetic properties of Pt/Co/heavy metal tri-layered structures

Zhang

Cao

Qiao

et al. 2017

Applied Physics Letters

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Pt/Co/heavy metal (HM) tri-layered structures with interfacial perpendicular magnetic anisotropy (PMA) are currently under intensive research for several emerging spintronic effects, such as spin-orbit torque, domain wall motion, and room temperature skyrmions. HM materials are used as capping layers to generate the structural asymmetry and enhance the interfacial effects. For instance, the Pt/Co/Ta structure attracts a lot of attention as it may exhibit large Dzyaloshinskii-Moriya interaction. However, the dependence of magnetic properties on different capping materials has not been systematically investigated. In this paper, we experimentally show the interfacial PMA and damping constant for Pt/Co/HM tri-layered structures through time-resolved magneto-optical Kerr effect measurements as well as magnetometry measurements, where the capping HM materials are W, Ta, and Pd. We found that the Co/HM interface play an important role on the magnetic properties. In particular, the magnetic multilayers with a W capping layer features the lowest effective damping value, which may be attributed to the different spin-orbit coupling and interfacial hybridization between Co and HM materials. Our findings allow a deep understanding of the Pt/Co/HM tri-layered structures. Such structures could lead to a better era of data storage and processing devices.

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“…The field at 20 from vertical which will switch the first grain is about 20%-25% of that at 20 which causes reversal of all the grains, depending on the particular parameters of the medium. Shorter switching times have been reported when the applied field is at 20 rather than vertical [3].…”

Section: Introductionmentioning

confidence: 94%

Optimization of heads for perpendicular recording

et al. 2002

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The effects of gap length, head-underlayer separation, and return pole potential on the magnitude and direction of the field of a gapped head are investigated using an analytic two-dimensional model. Criteria derived from a micromagnetic model of a perpendicular recording medium are used to optimize the head geometry for various media parameters. A head with a gap length which is at most 2.5 times the head-medium separation can write on higher coercivity media than a single pole.

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Micromagnetic study of switching speed in perpendicular recording media

Cited by 33 publications

References 5 publications

Vector recording in perpendicular media

Vector recording in perpendicular media

Influence of heavy metal materials on magnetic properties of Pt/Co/heavy metal tri-layered structures

Optimization of heads for perpendicular recording

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