Recording processes in perpendicular patterned media using longitudinal magnetic recording heads

Barbic, Mladen; Schultz, S.; Wong, Joyce Y.; Scherer, Axel

doi:10.1109/20.950929

Cited by 18 publications

(5 citation statements)

References 13 publications

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“…In recent years, many research groups have been studying the superparamagnetic limits of SD magnetic elements for uses in patterned media [17][18][19][20]. By patterning separate columns of magnetic material, patterned-media designers are hoping to extend hard-drive densities past 200 GB/in2.…”

Section: A Nanomagnetic Elementmentioning

confidence: 99%

Scaling Magnetic Actuators Beyond the Single-Domain Limit

Vasquez

Judy

2006

2006 1st IEEE International Conference on Nano/Micro Engineered and Molecular Systems

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Ferromagnetic sensors and actuators have been extensively studied on the microscale and have led to the development of optical switches [11, magnetically-tunable frequency-selective surfaces [21, magnetic assembly of out-ofplane-MEMS devices [31, and low-power to zero-power magnetometers [4-51. For many devices and applications there exist advantages in reducing the size of the system. The authors of this paper are studying the benefits and limitations of decreasing the scale of magnetic actuators. We have designed, fabricated, and tested torsional magnetic actuators that consist of a 1250-nm-long, 85-nm-wide, and 30-nm-thick magnetic element that is attached to a pair of 50-nm-thick, 100-nm-wide, and 2000-nm-long torsion beams.

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Section: A Nanomagnetic Elementmentioning

confidence: 99%

Scaling Magnetic Actuators Beyond the Single-Domain Limit

Vasquez

Judy

2006

2006 1st IEEE International Conference on Nano/Micro Engineered and Molecular Systems

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“…We list thin film magneto-resistive sensors, [15][16][17][18] asymmetric superconducting quantum interference devices ͑SQUIDs͒, 27 elongated microfabricated waveguides, 28 striplines, 29 and nanoparticle-tape-filled microcoils 30 used in NMR detection, planar asymmetric micro-Hall detectors, 31 and microwave near-field slit probes 32,33 as suitable candidates. Another possibility is the extension of the stripe array sensor idea into the submicron MRI resolution regime.…”

Section: Potential Applicationsmentioning

confidence: 99%

“…For example, in the scanning magnetoresistance microscopy, 15 the imaging sensor is a thin film magnetoresistive element of small thickness t and much larger width w. By raster scanning of this sensor in the x-y plane, a 2D image of a magnetic sample can be obtained. [15][16][17][18] There has been a perceived notion in those reports that 2D images obtained with a stripe-type magnetoresistive sensor are limited in spatial resolution by thickness t in the x direction, and width w in the y direction. It is the goal of this article to show that by linear scanning motion of the stripe-type sensor at different angular orientations combined with the tomographic imaging principles, 2D images of samples can be obtained that are limited in spatial resolution along both x and y axes by the thickness t, i.e., the smaller parameter of the sensor only.…”

Section: Introductionmentioning

confidence: 99%

Stripe sensor tomography

Barbic

Vltava

Barrett

et al. 2008

Review of Scientific Instruments

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We introduce a general concept of tomographic imaging for the case of an imaging sensor that has a stripelike shape. We first show that there is no difference, in principle, between two-dimensional tomography using conventional electromagnetic or particle radiation and tomography where a stripe sensor is mechanically scanned over a sample at a sequence of different angles. For a single stripe detector imaging, linear motion and angular rotation are required. We experimentally demonstrate single stripe sensor imaging principle using an elongated inductive coil detector. By utilizing an array of parallel stripe sensors that can be individually addressed, two-dimensional imaging can be performed with rotation only, eliminating the requirement for linear motion, as we also experimentally demonstrate with parallel coil array. We conclude that imaging with a stripe-type sensor of particular width and thickness ͑where the width is much larger than the thickness͒ is resolution limited only by the thickness ͑smaller parameter͒ of the sensor. We give examples of multiple sensor families where this imaging technique may be beneficial such as magnetoresistive, inductive, superconducting quantum interference device, and Hall effect sensors, and, in particular, discuss the possibilities of the technique in the field of magnetic resonance imaging.

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“…Only few methods of writing information in patterned magnetic media have been reported so fare including inductive recording heads [12][13][14], fields of magnetic force microscope (MFM) tips [15] or local heating [16] (thermo-magnetic writing) induced by current flow between magnetic media and MFM tips. With the latter method writing and reading of individual dots on a 29 Gbit/in 2 dot array using MFM tips was reported [16].…”

Section: Introductionmentioning

confidence: 99%

Magnetic reversal of sub-100 nm nanostructures studied by a FIB-trimmed recording head

et al. 2006

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Arrays of sub-100 nm square islands have been fabricated by patterning perpendicular Co 70 Cr 18 Pt 12 continuous films using focused ion beam (FIB) lithography. The recording studies were performed on a quasistatic write/read tester using FIB trimmed recording heads with a write width of about 100 nm. We demonstrate the ability to write controlled magnetic patterns by addressing individual single-domain islands in dense island arrays achieving bit densities as high as 60 Gbit/in 2 and to read back the written information. The range of write current over which single islands can be written is modeled using a write model which includes the write field distribution and the island switching field distribution. A window is found over which individual islands can be addressed without switching nearest neighbors.

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Recording processes in perpendicular patterned media using longitudinal magnetic recording heads

Cited by 18 publications

References 13 publications

Scaling Magnetic Actuators Beyond the Single-Domain Limit

Scaling Magnetic Actuators Beyond the Single-Domain Limit

Stripe sensor tomography

Magnetic reversal of sub-100 nm nanostructures studied by a FIB-trimmed recording head

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