Advancements in Research of Magnetic Recording

Judy, J.

doi:10.3379/jmsjmag.13.s1_s7

Cited by 8 publications

(11 citation statements)

References 73 publications

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“…Note that the magnetization component normal to the surface, and hence the perpendicular domains, do not contribute to the PNR signal, and it is exclusively produced by the DWs. This fact was confirmed by the micromagnetic simulations of the 20-nm-thick CoCrPt film with an image size of 1×1 μm 2 , where the components of the magnetic moment (M x , M y , and M z ) at 200 Oe (after in-plane saturation) are shown in Fig. 7(b).…”

Section: Resultssupporting

confidence: 58%

“…The hysteresis loops and the magnetic force microscopy images used samples with areas of 5×5 mm 2 cut from the center of the sample, where the layer thicknesses matched the nominal thickness values. However, polarized neutron measurements require larger areas, and samples were measured with areas as large as 3×3 cm 2 . The average film thickness of the large samples is less than the nominal thickness, with a reduction of ≈15%.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Thin film materials with perpendicular magnetic anisotropy have been widely studied for perpendicular magnetic recording media [1,2] and patterned magnetic media [3,4]. They are also increasingly important in new devices based on the movement of domain walls (DWs) for data storage [5] and logic applications [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

et al. 2014

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Ferromagnetic domain patterns and three-dimensional domain-wall configurations in thin CoCrPt films with perpendicular magnetic anisotropy were studied in detail by combining magnetic force microscopy and polarized neutron reflectometry with micromagnetic simulations. With the first method, lateral dimension of domains with alternative magnetization directions normal to the surface and separated by domain walls in 20-nm-thick CoCrPt films were determined in good agreement with micromagnetic simulations. Quantitative analysis of data on reflectometry shows that domain walls consist of a Bloch wall in the center of the thin film, which is gradually transformed into a pair of Néel caps at the surfaces. The width and in-depth thickness of the Bloch wall element, transition region, and Néel caps are found consistent with micromagnetic calculations. A complex structure of domain walls serves to compromise a competition between exchange interactions, keeping spins parallel, magnetic anisotropy orienting magnetization normal to the surface, and demagnetizing fields, promoting in-plane magnetization. It is shown that the result of such competition strongly depends on the film thickness, and in the thinner CoCrPt film (10 nm thick), simple Bloch walls separate domains. Their lateral dimensions estimated from neutron scattering experiments agree with micromagnetic simulations.

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Section: Resultssupporting

confidence: 58%

Section: Experimental Methodsmentioning

confidence: 99%

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Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

et al. 2014

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“…5 On account of many experimental and theoretical efforts to understand PMA, the perpendicular magnetic recording system came into practical use. However, the origin of PMA anisotropy in multilayered magnetic thin films is not yet clarified.…”

Section: Perpendicular Magnetic Anisotropy In Co/pt Multilayers Studimentioning

confidence: 99%

Perpendicular magnetic anisotropy in Co/Pt multilayers studied from a view point of anisotropy of magnetic Compton profiles

Ota

Itou

Sakurai

et al. 2010

Applied Physics Letters

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Magnetic Compton profiles (MCPs) of Co/Pt multilayers have been measured from a view point of perpendicular magnetic anisotropy (PMA). The PMA and the MCPs are discussed in the present Co/Pt results together with the previous Co/Pd results. The anisotropies of the MCPs have been decomposed into each magnetic quantum number |m|=0, 1, and 2. The decomposition analysis has suggested that the |m|=1 state contributes to the PMA when the multilayer films change in-plane magnetic anisotropy to the PMA, and that the |m|=2 state contributes to the PMA when the multilayer films have large PMA energy.

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“…[1][2][3][4] In this storage technique, medium noise is one of the crucial issues limiting the recording density. [1][2][3][4] In this storage technique, medium noise is one of the crucial issues limiting the recording density.…”

Section: Magnetic Reversal Field Map Combined With Medium Noise Analymentioning

confidence: 99%

Magnetic reversal field map combined with medium noise analysis in CoCrPt–SiO2 granular perpendicular recording medium

Ishio

Wasiya

Saito

et al. 2006

Journal of Applied Physics

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Reverse dc erase medium noise analysis on exchange-coupling effect in coupled granular/continuous perpendicular recording media J. Appl. Phys. 93, 7855 (2003); 10.1063/1.1557757 Effects of intermediate layers on magnetic properties and read/write performance in CoCrPt perpendicular recording media with an FeHfN soft magnetic underlayerThe spatial distribution of the magnetic reversal field ͑MRF͒ in a CoCrPt-SiO 2 granular perpendicular recording medium was measured with in-field magnetic force microscopy and combined with the recorded pattern and the medium noise observed at the same location. The areas having low MRF tend to make reverse domains at bit or zigzag transition boundaries, while regions with high MRF do not correlate well with medium noise. The MRF map measured at 20 Oe intervals shows that magnetic reversal occurs mainly in regions adjacent to an already reversed area, suggesting the existence of moderate intergrain exchange couplings. It is concluded that control of the spatial fluctuation of physical parameters such as intergrain exchange interactions, the anisotropy field, grain size, and chemical composition is essential to reduce the medium noise.

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Advancements in Research of Magnetic Recording

Cited by 8 publications

References 73 publications

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

Perpendicular magnetic anisotropy in Co/Pt multilayers studied from a view point of anisotropy of magnetic Compton profiles

Magnetic reversal field map combined with medium noise analysis in CoCrPt–SiO2 granular perpendicular recording medium

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