Patterned Media Fabricated by Lithography and Argon-Ion Milling

Kitade, Y.; Komoriya, H.; Maruyama, Takashi

doi:10.1109/tmag.2004.830165

Cited by 21 publications

(12 citation statements)

References 9 publications

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“…INTRODUCTION THE origin and control of the distribution of the switching fields (SFD) of nanostructured arrays of single-domain, perpendicularly-oriented magnetic materials is mystery in need of a solution before data storage schemes based on bit patterned arrays and digital logic devices based on magnetic cellular automata can be successfully implemented [1][2][3][4][5][6]. Several causes have been proposed, lithographic [3], microstructural [4], and magnetic [5].…”

Section: Sponsoring/monitoring Agency Name(s) and Address(es) 10 Spomentioning

confidence: 99%

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The Effect of Size Distribution on the Switching Field Distribution of Co/Pd Multilayered Nanostructure Arrays

Smith

Rantschler

Ruchhoeft

et al. 2008

2008 8th IEEE Conference on Nanotechnology

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Section: Sponsoring/monitoring Agency Name(s) and Address(es) 10 Spomentioning

confidence: 99%

“…Several causes have been proposed, lithographic [3], microstructural [4], and magnetic [5]. Indeed, these are not mutually exclusive, as the orientation of the grains affects their anisotropy, providing ideal sites for nucleation embryos [6].…”

Section: Sponsoring/monitoring Agency Name(s) and Address(es) 10 Spomentioning

confidence: 99%

The Effect of Size Distribution on the Switching Field Distribution of Co/Pd Multilayered Nanostructure Arrays

Smith

Rantschler

Ruchhoeft

et al. 2008

2008 8th IEEE Conference on Nanotechnology

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“…Even carefully prepared samples of thin magnetic films on non-magnetic surfaces and magnetic islands patterned from such films have been found to have a wide distribution of nucleation volumes [10][11][12]. For example, experiments on Co/Pd islands as large as 5 µm [12] have shown that the switching field distribution (SFD) of patterned islands is a reflection of the spatial variation of the nucleation volume of the continuous film from which the islands were formed.…”

Section: Introductionmentioning

confidence: 99%

Calculations of switching field and energy barrier for magnetic islands with perpendicular anisotropy

Liashko¹,

Jónsson²,

Uzdin³

2017

Nanosystems: Phys. Chem. Math.

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Calculations of the magnetic field required to reverse the magnetization of islands with out-of-plane anisotropy are carried out using a model describing nucleation followed by rapid domain wall motion. The calculations are based on an extension of the Stoner-Wohlfarth model where thermal activation is taken into account as well as the applied magnetic field. The calculated switching field distribution (SFD) is compared with recently reported experimental measurements of de Vries et al. [New J. Phys. 19, 093019 (2017)] on circular 220 nm CoPt islands.The measured results can be closely reproduced by choosing appropriate values of two parameters, the nucleation volume, and the effective anisotropy. Both the position of SDF peaks and their width at high and low temperature, 300 K and 10 K, are amply described using the same set of parameter values for a given island, while there is a large difference between islands with weak and strong magnetic anisotropies. There is no need to introduce the temperature dependence of the activation energy at zero field. This is in contrast with the estimates obtained from the so-called diamond model used by de Vries et al. in their data analysis where multiple adjustable parameters are introduced, and a three-to fourfold change in the zero field activation energy is invoked.

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“…Two major fabrication methods exist for BPM (Thomson et al 2006;Shaw et al 2007;Kitade et al 2004). In the first method, a layer of high coercivity magnetic material is first deposited on a flat substrate.…”

Section: Introductionmentioning

confidence: 99%

“…However, a main disadvantage of this method is that the magnetic material can easily be damaged by the ion etching patterning process. Furthermore, material removed during ion-etching can be re-deposited on the media during the patterning process, which is undesirable (Shaw et al 2007;Kitade et al 2004). In the second method, the substrate is lithographically prepatterned into islands, or so-called pillars, before the magnetic material is deposited.…”

Section: Introductionmentioning

confidence: 99%

Planarization of patterned magnetic recording media to enable head flyability

et al. 2011

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The fabrication and planarization of patterned magnetic recording media is investigated and the flyability of magnetic recording sliders on a patterned and planarized 65 mm glass disk is investigated a small coupon of patterned media with an array of nano pillars of 40 nm diameter and 60 nm height was first fabricated by e-beam lithography and reactive ion etching (RIE) to investigate the planarization process for patterned media. Since read/ write flyability tests require a patterned disk rather than a small coupon area, we have prepared a bit patterned glass disks of 65 mm diameter (2.5 in.) using the so-called ''Ag ball-up process'' in combination with RIE. This ''Ag ballup process'' permits the manufacturing of a nano-sized bit patterns on a large area, i.e., on a disk with 65 mm diameter. Planarization of the patterned area was performed with hydrogen silsesquioxane (HSQ) by spin coating. The HSQ layer was back-etched using RIE, resulting in a smooth surface. ''Flyability testing'' indicates significantly improved flying stability of typical magnetic recording sliders on the planarized glass disks, with the standard deviation of flying height fluctuations on the order of 0.1 nm. The latter value is comparable to that of ''smooth'' disks.

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Patterned Media Fabricated by Lithography and Argon-Ion Milling

Cited by 21 publications

References 9 publications

The Effect of Size Distribution on the Switching Field Distribution of Co/Pd Multilayered Nanostructure Arrays

The Effect of Size Distribution on the Switching Field Distribution of Co/Pd Multilayered Nanostructure Arrays

Calculations of switching field and energy barrier for magnetic islands with perpendicular anisotropy

Planarization of patterned magnetic recording media to enable head flyability

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