Fabrication and magnetic properties of CoPt perpendicular patterned media

Aoyama, T.; Okawa, S.; Hattori, Katsumi; Hatate, H.; Wada, Yuji; Uchiyama, Kenji; Kagotani, T.; Nishio, Hiroaki; Sato, Isamu

doi:10.1016/s0304-8853(01)00332-8

Cited by 33 publications

(4 citation statements)

References 5 publications

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“…Although the development of microfabrication techniques has successfully led to the formation of nanometre-sized magnetic dot arrays with well-defined geometry [4][5][6][7][8][9][10][11][12], it is difficult to completely exclude some structural defects from microfabricated dots, e.g. microfabrication damage or roughness at the surface and the fringe.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal process in microfabricatedL1₀-FePt dots

Wang¹,

Seki²,

Takanashi³

et al. 2008

J. Phys. D: Appl. Phys.

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The magnetization reversal process in microfabricated FePt (0 0 1) dots with a diameter of 250 nm is experimentally investigated based on phenomenological analysis. The initial and minor magnetization curves show that the magnetization reversal of the FePt dots is dominated by the nucleation of reversed domains. The phenomenological analysis of the coercivity (Hc) gives the defect regions for nucleation as 26 ± 4 nm and 18 ± 6 nm for the FePt dots before and after annealing, respectively. The reduction of the defect regions after annealing is in agreement with the enhancement of Hc for the annealed dots. Micromagnetic simulations also show the reduction of Hc due to the existence of defects in a dot, which is consistent with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Magnetization reversal process in microfabricatedL1₀-FePt dots

Wang¹,

Seki²,

Takanashi³

et al. 2008

J. Phys. D: Appl. Phys.

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“…Several approaches have been investigated to deposit nanoscale islands onto a pattern; these are classified as additive or subtractive. Electrodeposition of nanoscale islands in a hole pattern is an example of an additive process, − while the sputter-deposition of a blanket film onto a pattern followed by dry-etching is an example of a subtractive process. , Self-assembly of magnetic nanoparticles is also a possible method that does not involve the previous preparation of a pattern, , but the difficulty to provide a well-defined crystallographic orientation causes the medium to degrade the recording performance. The additive method using electrodeposition has the best potential to provide a pattern only limited by the lithography quality, since electrodeposition features selective deposition only at conductive regions, resulting in a high-quality reproduction of the pattern.…”

Section: Introductionmentioning

confidence: 99%

Templated Electrochemical Synthesis of Fe–Pt Nanopatterns for High-Density Memory Applications

Wodarz

Hashimoto

Kambe

et al. 2018

ACS Appl. Nano Mater.

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We demonstrate an electrochemical deposition process suitable to form arrays of L10 Fe–Pt nanodots with hard magnetic properties via electron-beam lithography, template deposition, and thermal annealing. Synthesis parameters are selected by growing single and multilayer blanket films and investigating the effect of thermal annealing on the various films. We find that the fastest ordering transformation is achieved in eight-layer Fe–Pt multilayers with a sublayer thickness of 2.5 nm, while a single Fe–Pt layer or four- and twenty-layer multilayers exhibit a more sluggish ordering process due to the imperfect layering (twenty-layer) or to the limited mean free path upon annealing (single- and four-layer); the coercivity of the eight-layer Fe–Pt multilayer after annealing at 450 °C reached 6.6 kOe, whereas the single Fe–Pt layer showed only 1.0 kOe. TEM imaging and diffraction show that the L10 Fe–Pt nanodot arrays are single crystal with a (111) orientation, suggesting a facile L10 ordering when using a multilayer structure.

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“…Early studies on patterned media [14,15], with the exception of the study by Y. Nakamura, had not focused on the media with perpendicular anisotropy. Although many papers on the fabrication of magnetic dot arrays have been published [16,17], few have focused either on the thermal stability design, the influence of magneto-static interaction between dots, or the recording conditions such as writability of heads. Especially, write conditions without a bit interference with neighbor dots, which may determine the dot array configuration, such as dot separation, shape and magnetic properties have not been discussed.…”

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confidence: 99%

Perpendicular Magnetic Recording Medium for a Density Beyond 1 Tera Bit/inch2

Ouchi

Honda

2009

Nanostructure Science and Technology

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Perpendicular magnetic recording was proposed by Professor S. Iwasaki in 1977[1] as a scheme superior to that of longitudinal recording in terms of high density recording performances. The new HDD (hard disk drive) system of perpendicular recording was commercialized in 2005. The area recording density started at 133 Gbit/inch 2 [2], which far surpassed the achieved density of the conventional HDD of longitudinal recording. In 2006, successful demonstrations of the highest density at around 350-420 Gbit/inch 2 were announced, one after another, by HDD manufacturers [3]; no other new information storage technology superior to magnetic recording has been proposed as yet. Thus, perpendicular recording is expected to dominate over the existing information storage technology in the near future.Perpendicular magnetic recording (PMR) has the great advantages of a single pole high writeability of recording in the gap between the head and the medium soft under layer, a high recording resolution of anti-parallel magnetization transition with no demagnetizing field, and a high thermal stability with a rather thick recording layer, when compared with the longitudinal magnetic recording (LMR) used so far . These advantages in PMR and the lately diagnosed limitation of thermal stability of the LMR media accelerated the commercialization of PMR at around a density of over 100 Gbits/inch 2 ,where the PMR media have a large-enough margin for the limit of thermal stability. Construction of the commercialized PMR system is based on the original principle of PMR, in which the combination of a single pole head and a composite medium with a soft magnetic back layer was essential. Presumably, however, as long as granular type media are used, even the PMR system would face thermal

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Fabrication and magnetic properties of CoPt perpendicular patterned media

Cited by 33 publications

References 5 publications

Magnetization reversal process in microfabricatedL1₀-FePt dots

Magnetization reversal process in microfabricatedL1₀-FePt dots

Templated Electrochemical Synthesis of Fe–Pt Nanopatterns for High-Density Memory Applications

Perpendicular Magnetic Recording Medium for a Density Beyond 1 Tera Bit/inch2

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Fabrication and magnetic properties of CoPt perpendicular patterned media

Cited by 33 publications

References 5 publications

Magnetization reversal process in microfabricatedL10-FePt dots

Magnetization reversal process in microfabricatedL10-FePt dots

Templated Electrochemical Synthesis of Fe–Pt Nanopatterns for High-Density Memory Applications

Perpendicular Magnetic Recording Medium for a Density Beyond 1 Tera Bit/inch2

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Magnetization reversal process in microfabricatedL1₀-FePt dots

Magnetization reversal process in microfabricatedL1₀-FePt dots