Comparison of perpendicular and longitudinal magnetic recording using a contact write/read tester

Leonhardt, Tobias; Veerdonk, R.J.M. van de; Heijden, P.A.A. van der; Clinton, T. W.; Crawford, T. M.

doi:10.1109/20.950906

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…Figure 1(A) shows both data and servo-patterned regions of the medium, with the servo sector comprising the varying width marks running diagonally from the left center to the lower right corner of figure 1(A). In addition to using pre-written regions of media for nanoparticle assembly, we employ a contact recording tester [27] to magnetically record the desired transition patterns into the medium. A contact tester is a scanning probe tool that scans a magnetic recording head with nanometer precision while in contact with disk media, with electrical connections to the recording head providing for both programmed precision magnetic recording and transition field imaging with the GMR readback head [19].…”

Section: Disk Drive Medium Used For Nanoparticle Coatingmentioning

confidence: 99%

Pattern transfer nanomanufacturing using magnetic recording for programmed nanoparticle assembly

et al. 2012

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We report a novel nanomanufacturing technique that incorporates patterned arrays built entirely from Fe₃O₄ nanoparticles into a flexible and transparent polymer film. First, the nanoparticles are patterned using the enormous magnetic field gradients at the surface of commercial disk drive media, and then the resulting architecture is transferred to the surface of a polymer film by spin-coating and peeling. Since the particles are immobilized by the field gradients during the spin-coating process, the patterned array is preserved after peeling. To demonstrate the potential of this technology, we fabricate a 5 mm diameter all-nanoparticle diffraction grating capable of producing a white-light optical spectrum. We also demonstrate several extensions to this technology, where, by adding an external magnetic field during assembly, we create both periodic variations in topography, as well as a nanocomposite with two vertically and horizontally separated nanoparticle layers. As this technique leverages the nanometer resolution inherent in current magnetic recording technology, strong potential exists for low-cost nanomanufacturing of optical and electronic devices from a variety of nanomaterials with ∼10 nm resolution.

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Section: Disk Drive Medium Used For Nanoparticle Coatingmentioning

confidence: 99%

Pattern transfer nanomanufacturing using magnetic recording for programmed nanoparticle assembly

et al. 2012

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“…Contact Tester : A contact tester was employed to record PMR media that assemble magnetic nanoparticles into 2D patterns as programmed. The contact tester uses commercial magnetic recording write/read heads and 10 nm resolution XY translation stages.…”

Section: Methodsmentioning

confidence: 99%

Magnetic‐Field‐Directed Self‐Assembly of Programmable Mesoscale Shapes

Pearson

Dolbashian

et al. 2016

Adv Funct Materials

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User‐programmed meso‐ to microscale 2D shapes using magnetic nanoparticles as building blocks with magnetic‐field‐directed self‐assembly are created. The assembly templates are magnetically recorded using perpendicular magnetic recording (PMR) media. The results demonstrate that PMR can template user‐designed features in two dimensions down to 30 nm in size, i.e., the nanoparticle diameter. It has been also shown that the nanoparticles assemble onto transitions between oppositely magnetized regions in the medium. At these transitions, the magnetic field gradients are extremely large (25 MT m−1 2 nm above the medium) and change rapidly with height (≈1015 T/m/m within 20 nm of the surface). It is found that 30 nm diameter particles assemble into 1–2 layers with feature widths ranging from 30 to 350 nm. It is hypothesized that large lateral growth can occur because the magnetic forces parallel to the disk extend up to 150 nm on either side of a recorded transition, falling off more slowly with distance than the vertical magnetic forces. Once lateral growth saturates, a second layer of nanoparticles begins to assemble on top of the first layer, suggesting strong potential for controlling layer‐by‐layer assembly through appropriate design of the medium and its resulting field gradient profiles.

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“…This tool has found application for studying advanced magnetic media, as well as the recording process on unflyable media and sliders [6][7][8]. The contact write/read tester is operated by placing a recording head on a vertical lift stage (z-stage) and raising it into contact with a media disc such that the transducer, mounted on a conventional head-gimbal-assembly (HGA), is within the flying height of the disc [9].…”

Section: Methodsmentioning

confidence: 99%

Direct measurement of the field from a magnetic recording head using an InAs Hall sensor on a contact write/read tester

Gokemeijer

Clinton

Crawford

et al. 2005

Journal of Magnetism and Magnetic Materials

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Comparison of perpendicular and longitudinal magnetic recording using a contact write/read tester

Cited by 12 publications

References 8 publications

Pattern transfer nanomanufacturing using magnetic recording for programmed nanoparticle assembly

Pattern transfer nanomanufacturing using magnetic recording for programmed nanoparticle assembly

Magnetic‐Field‐Directed Self‐Assembly of Programmable Mesoscale Shapes

Direct measurement of the field from a magnetic recording head using an InAs Hall sensor on a contact write/read tester

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