Yeoungchin Yoon's research while affiliated with University of California, San Diego and other places

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Publications (3)

Fig. 1 Schematic of fabrication of bit patterned media (BPM) using...
Table 1 Flying height on BPM with various recess depths after planarization
Fig. 4 SEM (upper) and AFM (lower) images of a before planarization and...
Fig. 5 SEM images of a patterned pillars with Ag ''ball-up'' method, b...
Fig. 6 Fluctuations of flying height of sliders on a unpatterned smooth...
Planarization of patterned magnetic recording media to enable head flyability
Article
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  • Mar 2011
The fabrication and planarization of patterned magnetic recording media is investigated and the flyability of magnetic recording sliders on a patterned and planarized 65mm glass disk is investigated a small coupon of patterned media with an array of nano pillars of 40nm diameter and 60nm height was first fabricated by e-beam lithography and reactiv...
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Fig. 3. (a) 45 degree tilted SEM image of electroless etched and...
Strongly Superhydrophobic Silicon Nanowires by Supercritical CO2 Drying
Article
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  • Jun 2010
This paper reports on the extremely superhydrophobic behavior of supercritical CO2 processed silicon nanowires SiNWs) with a contact angle in excess of ∼177°. Vertically aligned silicon nanowires with 10 nm to 40 nm diameter and 1 mm to 3 mm in length were obtained by electroless etching (EE) technique. The asfabricated SiNWs were superhydrophilic...
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Figure 1: Model for bit patterned disk
Figure 2: Schematic of the BPM head-disk interface
Figure 3: Femto slider designs used in simulation
Fig. 4 Unstructured triangular mesh on air bearing surface (Slider A:...
+5 Figure 5: Pressure distribution of slider A on BPM disk a whole ABS, b...
Air Bearing Simulation for Bit Patterned Media
Article
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  • Jan 2009
Patterned media are being considered as a promising approach for achieving storage densities beyond 1Tb/in2 on hard disks. Patterned media reduce cross talk of adjacent bits and improve thermal stability of the media. In this investigation, the flying characteristics of femto-type sliders over bit patterned media (BPM) are investigated. The discret...
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Citations

... Although this type of device can involve many advantages in terms of area and performance (e.g., lower short channel effects), a more challenging manufacturing process is required, especially regarding procedures that create device contacts. Chemical mechanical polishing (CMP) [5] is the better-established method to planarize horizontal structures and then properly contact the devices. However, CMP is not fully adapted to 3D structures [6] and it becomes a drawback in some applications where the overall procedure must remain as simple as possible. ...
Reference: Exploring Strategies to Contact 3D Nano-Pillars
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... Since the oxidizing agent causes the formation of a thin oxide layer on the Si NP surface, the final result is that the (flexible) NPs bundle up due to capillary forces [20,21], forming tip aggregates. Bundling may be avoided by replacing spontaneous drying with super-critical drying [22,23]. As a simpler alternative, either water is replaced with less polar solvents or the NP surface oxide is etched by HF as a last step before drying [21], avoiding any capillary-driven tip agglomeration of nonpolar (hydrogenated) NP surfaces. ...
Reference: Fabrication of Metal Contacts on Silicon Nanopillars: The Role of Surface Termination and Defectivity
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... Currently, the magnetic recording density is approaching the superparamagnetic limit, and further increase of the magnetic recording density depends on new innovations of technology. One of the most promising approaches is the application of patterned media, which can be further divided into discrete track media (DTM) [1] and bit patterned media (BPM) [2]. By eliminating the magnetic transition noise, the patterned media can further improve the magnetic recording density. ...
Reference: Air Bearing Features on Discrete Track Media
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