Thermal issues and their effects on heat-assisted magnetic recording system (invited)

Xu, Baoxi; Liu, Z. J.; Ji, R.; Toh, Ying Xiu; Hu, Jingtian; Li, J. M.; Zhang, J.; Ye, K. D.; Chia, Cheow Wee

doi:10.1063/1.3671421

Cited by 58 publications

(19 citation statements)

References 30 publications

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“…14 The light delivery poses the most serious challenge because focussing the heat to the required nanometre spot size by means of a nearfield transducer featuring a plasmonic resonator 15 inevitably leads to high losses. 16 Those in turn cause material degradation (particularly of the lubricant on the surface of the recording medium 17 ) and eventually result in total device failure. 18 The last major breakthrough in HDD technology was the transition from longitudinal magnetic recording (LMR) to perpendicular magnetic recording (PMR), 19 as depicted in Figs.…”

Section: Introductionmentioning

confidence: 99%

A review of high magnetic moment thin films for microscale and nanotechnology applications

et al. 2016

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The creation of large magnetic fields is a necessary component in many technologies, ranging from magnetic resonance imaging, electric motors and generators, and magnetic hard disk drives in information storage. This is typically done by inserting a ferromagnetic pole piece with a large magnetisation density M S in a solenoid. In addition to large M S , it is usually required or desired that the ferromagnet is magnetically soft and has a Curie temperature well above the operating temperature of the device. A variety of ferromagnetic materials are currently in use, ranging from FeCo alloys in, for example, hard disk drives, to rare earth metals operating at cryogenic temperatures in superconducting solenoids. These latter can exceed the limit on M S for transition metal alloys given by the Slater-Pauling curve. This article reviews different materials and concepts in use or proposed for technological applications that require a large M S , with an emphasis on nanoscale material systems, such as thin and ultra-thin films. Attention is also paid to other requirements or properties, such as the Curie temperature and magnetic softness. In a final summary, we evaluate the actual applicability of the discussed materials for use as pole tips in electromagnets, in particular, in nanoscale magnetic hard disk drive read-write heads; the technological advancement of the latter has been a very strong driving force in the development of the field of nanomagnetism.

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Section: Introductionmentioning

confidence: 99%

A review of high magnetic moment thin films for microscale and nanotechnology applications

et al. 2016

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“…In recent years, the cyclotriphosphazene ring is commonly used together with PFPE chains to produce new lubricants . The inspiration to develop this type of lubricants was spurred by the well‐known lubricant additive X1P (Scheme ) .…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the cyclotriphosphazene ring is commonly used together with PFPE chains to produce new lubricants. [7][8][9][10][11] The inspiration to develop this type of lubricants was spurred by the well-known lubricant additive X1P (Scheme 1). 12,13 Cyclotriphosphazene-based lubricants usually have a relatively lower surface mobility than that of the corresponding PFPE lubricant.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Wang

Tan

Cho

et al. 2016

Lubrication Science

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A novel hard disk lubricant IDL2 was synthesised by reacting sodium 4‐((2,2‐dimethyl‐1,3‐dioxolan‐4‐yl)methoxy)phenoate with hexachlorocyclotriphosphazene, followed by treatment with 1H,1H‐perfluoro‐3,6,9‐trioxatridecan‐1‐ol in the presence of sodium hydride and subsequent hydrolysis using sulfuric acid. The chemical structure of IDL2 was confirmed by proton nuclear magnetic resonance (1H NMR), phosphorus‐31 (31P) NMR spectroscopy and mass spectrometer. The thermal property of IDL2 was analysed using thermal gravimetric analysis (TGA) and it shows better thermal stability than two commercial lubricants Z‐DOL and Z‐Tetraol with two and four terminal hydroxy groups, respectively. IDL2 was found to have comparable hydrophobicity to commercial lubricants Z‐DOL, A20H and Z‐Tetraol with water contact angles in the range of 78 – 85°, revealing that IDL2 has analogous surface energy to these commercial lubricants. IDL2 exhibits comparable friction coefficient to A20H and Z‐Tetraol, but much lower than Z‐DOL. More interestingly, it has a much high bonding ratio when compared with commonly used commercial lubricants under the same testing conditions due to the presence of two polar hydroxy groups, which enhance the interaction between lubricant and substrate. These promising properties of IDL2 show that it would be very potential for real application as a hard disk drive lubricant. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Temperature rise also changes the NFTwriting pole separation, which may cause variations in coupling efficiency by attenuating the resonance [12] since the writing pole is made of metal and is part of the resonance structure. Thermal modeling [71][72][73] has been carried out to study dependence of NFT temperature rise on absorbed power, its size, and the NFT-pole separation, as shown in Figure 8 [72]. The temperature increases linearly with the heat dissipation in NFT and could rise by several hundred degrees.…”

Section: Nft Self-heating and Materials Choicementioning

confidence: 99%

Plasmonic near-field transducer for heat-assisted magnetic recording

Zhou

Hammack³

et al. 2014

Nanophotonics

136

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Plasmonic devices, made of apertures or antennas, have played significant roles in advancing the fields of optics and opto-electronics by offering subwavelength manipulation of light in the visible and near infrared frequencies. The development of heat-assisted magnetic recording (HAMR) opens up a new application of plasmonic nanostructures, where they act as near field transducers (NFTs) to locally and temporally heat a sub-diffractionlimited region in the recording medium above its Curie temperature to reduce the magnetic coercivity. This allows use of very small grain volume in the medium while still maintaining data thermal stability, and increasing storage density in the next generation hard disk drives (HDDs). In this paper, we review different plasmonic NFT designs that are promising to be applied in HAMR. We focus on the mechanisms contributing to the coupling and confinement of optical energy. We also illustrate the self-heating issue in NFT materials associated with the generation of a confined optical spot, which could result in degradation of performance and failure of components. The possibility of using alternative plasmonic materials will be discussed.

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Thermal issues and their effects on heat-assisted magnetic recording system (invited)

Cited by 58 publications

References 30 publications

A review of high magnetic moment thin films for microscale and nanotechnology applications

A review of high magnetic moment thin films for microscale and nanotechnology applications

Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Plasmonic near-field transducer for heat-assisted magnetic recording

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