We present a comprehensive analysis of the areal density potential bit-patterned media recording. The recording performance is dominated by written-in errors rather than traditional signal-to-noise considerations. Written-in are caused statistical fluctuations magnetic properties and locations individual dots. highest densities obtained with combination pole head, soft underlayer, storage medium composite type. Areal scenarios up to 5 Tb/in <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Abstract Plasmonic devices, made of apertures or antennas, have played significant roles in advancing the fields optics and opto-electronics by offering subwavelength manipulation light visible near infrared frequencies. The development heat-assisted magnetic recording (HAMR) opens up a new application plasmonic nanostructures, where they act as field transducers (NFTs) to locally temporally heat sub-diffraction-limited region medium above its Curie temperature reduce coercivity. This allows...

Recording on bit-patterned media, BPM, is one way to postpone the superparamagnetic limit higher densities. Here we investigate recording potential of BPM. The fundamental idea media that grain represents bit so entire volume resists effect thermal agitation and density can be achieved. Previous investigations a BPM system have shown densities greater than 1 Tb/in2 should possible [2].

Heat-assisted magnetic recording (HAMR) is being developed as the next-generation technology. Critical aspects of this technology, such plasmonic near-field transducer (NFT) and high anisotropy granular FePt media, have been demonstrated reported. However, progress with areal density was limited until recently. In paper, we report a basic technology demonstration (BTD) HAMR, at 1.007 Tbpsi linear 1975 kBPI track 510 kTPI, resulting from advances in heads NFT FePtX media. This not only shows...

A comprehensive analysis of the areal density potential bit-patterned media recording shows that performance is dominated by written-in errors. The statistical fluctuations magnetic properties and locations individual bits lead to error probabilities so some dots are either not recorded at all or cannot be in time window necessary ensure synchronized writing. highest densities obtained with a combination pole head, soft underlayer, storage medium composite type. Areal scenarios up...

Heat-assisted magnetic recording (HAMR) limitations and extendibility are studied in light of the recent 1.0 Tb/in <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> technology demonstration. The paper examines HAMR specific challenges, including switching field distributions at elevated temperature, saturation noise, near-field transducer (NFT) thermal spot-size limits. While current density ( ~ 1 ) is limited by distribution spot size,...

A new magnetic recording system is evaluated that includes the single-pole head, a medium design, and soft underlayer of perpendicular recording. The proposed consists grains with anisotropy directions tilted optimally about 45° respect to direction. Here, focus on tilt angle at in crosstrack direction, including small but typical dispersion. write pole tapered-neck head very throat height yields maximized fields without increased edge track degradation. advantages are discussed using...

Differences in the areal-density capability limits for heat-assisted magnetic recording (HAMR) and conventional perpendicular (PMR) are explored using spinstand measurements, drive footprinting, micromagnetic modeling. The written track curvature is measured with a special technique that mitigates cross-track averaging effects due to finite read sensor width. Tracks HAMR heads shown have more curvatures compared those modern PMR writers. Mitigation of demonstrated two different writer...

The recent proposal of tilted perpendicular recording for Tb/in <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> densities is extended here to examine the effects intergranular exchange and anisotropy distributions on signal-to-noise ratio. This new system includes single pole head, medium soft underlayer as in recording, but axes are titled at about 45°, optimally crosstrack direction. Both analytical formulas micromagnetic simulations...

An ultrastretchable iono-elastomer with resistance sensitive to both elongation strain and temperature has been developed by hierarchical self-assembly of an end functionalized triblock copolymer in a protic ionic liquid (ethylammonium nitrate) followed cross-linking. Small-angle X-ray scattering experiments situ uniaxial reveal nanoscale microstructural transition the hierarchically self-assembled cross-linked micelles that is responsible for material's remarkable mechanical conductivity...

The slow magnetization dynamics in magnetic thin films has been investigated this paper. It is shown that the experimental results of time-dependent can be well described by extended exponential function, exp(−(t/τ)β) with β>0, a number film systems. By investigating characteristics process and examining limitations present models, an explanation provided based on structural dynamical properties domains. Meanwhile, some questions have clarified study towards understanding relaxation phenomenon films.

We review the 2 Tbit/in <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> reader design landscape based on existing knowledge and projection. found that signal-to-noise ratio (SNR) requirement will be highly challenging due to rapid increase in noise additional requirements from assisted writing. An acceptable level of channel bit density can achieved spite a slow head-to-media spacing (HMS) reduction provided both shield-to-shield (SS)...

A micromagnetic model based on a regular mesh is built to simulate CoX/Pt magnetic recording media containing polycrystalline structure using the Voronoi tessellation method. The crystal grains have be segregated in media; thus, two phases crystalline grain and at boundary are treated separately. demagnetizing field cell calculated by fast Fourier transform method, even if M <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> distribution...

A three-dimensional micromagnetic perpendicular recording model has been developed to study the dynamics of recording. The write field rise time, shape, and magnitude are investigated. At a data rate 1 Gb/s, our simulation shows that after ns, dynamic field, both shape magnitude, about same as compared static field. magnetostatic medium causes maximum 10% decrease in hard transition. For flux time 0.2 head fields follow reversal closely. 0.1 average magnetization at air bearing surface (ABS)...

In order to achieve higher areal density, magnetization transition width must be reduced. This requires small media switching field distribution (SFD). Here we explore SFD and in heat assisted magnetic recording microwave recording. We reveal that for energy recording, additional broadening exists as compare conventional perpendicular show the effect of on implications system density increases.

Heat-assisted magnetic recording (HAMR) is a fast evolving technology, and has been established as the next enabler of higher areal density in recording. After achieving high capability, HAMR drive integration was recently demonstrated. In this paper, we discuss some recent learning from component performance integration. We identify key challenge integration: erasure due to thermal background heating. The heating introduced improve near-field transducer reliability reduce laser power...

Magnetic data storage has made rapid progress in terms of areal density over the past few decades. Current products have levels that exceed 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">12</sup> bits per square inch, about 1000 times greater than densities mid-1990s. Five component technologies become hard-disk-drive industry standards two decades: read heads based on giant magnetoresistance or tunneling magnetoresistance, perpendicular...

Theoretical calculation for a simple nanoscale magnetoelectronic device to function as microwave generator based on the spin-transfer torque effect is presented. The unique because output amplitude and frequency can be continuously tuned by electrical current in range. Analysis discussion of structure, function, realization are provided.

In this work, the microstructure and magnetostriction effect of FeCo thin film are considered in micromagnetic simulations; therefore magnetic properties write pole can be calculated more accurately. Based on models, hysteresis loops films calculated. The simulation results show that has great coercive force films. Furthermore, initial permeability dynamic response studied. When easy axis is along cross-track direction, a 128 nm-wide 32 nm × nm-ABS tip real 8.0 at low frequencies roll-off...

A simple energy surface model is introduced to explain single domain particle switching under sub-Stoner–Wohlfarth fields. The criterion that if the initial exceeds subsequent barrier maximum, then can reverse. Reversal will occur only for small damping constants and short field rise times, so magnetization dynamics explores a sufficiently large portion of surface. results are confirmed by micromagnetic analyses consistent with both scale simulation experimental data. This effect may be...

We collate multiple experimental measurements of heat-assisted magnetic recording (HAMR) near-field transducer (NFT) and reader sensitivity on spinstand to compare contrast with the conventional perpendicular (PMR). The readback process shares many similarities, but differences appear due increased measured curvature prewritten track, which increases observed pulsewidth (Pw50), lower amplitude reduced flux from media transition (MrT), coating thicknesses. find that head-to-media spacing...

In this work, the hysteresis loops of ultra thin CoFeB films with perpendicular anisotropy are simulated using a micromagnetic model microstructure included. An inhomogeneous region uniaxial constant K is introduced in model, and key factor to explain why in-plane saturation field several thousand Oersted, while coercivity can be on order 100 Oersted. Tendency increasing total simulation size reveals that reliable, calculated basically agree experiments. The effects different distribution,...