HAMR Areal Density Demonstration of 1+ Tbpsi on Spinstand

Wu, Alexander Q.; Kubota, Yukiko; Klemmer, T. J.; Rausch, Tim; Peng, Chao; Peng, Yingguo; Karns, Duane; Zhu, Xiaobin; Ding, Yunfei; Chang, Eric K. C.; Zhao, Yongjun; Zhou, Hua; Gao, Kai-Zhong; Thiele, J.-U.; Seigler, Michael A.; Ju, Ganping; Gage, Edward C.

doi:10.1109/tmag.2012.2219513

Cited by 124 publications

(59 citation statements)

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“…[1][2][3][4] The main technological difference between HAMR and conventional perpendicular magnetic recording (PMR) lies in the writing process, which involves local heating to beyond the Curie temperature T C using light, followed by rapid cooling in the presence of the applied head field to switch the magnetization. HAMR can solve the technology trilemma that PMR is now facing.…”

mentioning

confidence: 99%

Experimental estimates of in-plane thermal conductivity in FePt-C granular thin film heat assisted magnetic recording media using a model layered system

Sharma

Ong

et al. 2013

Applied Physics Letters

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Cross-plane thermal conductivity kth measurements of vertical stacks of FePt/C were used to estimate the in-plane thermal conductivity of Heat Assisted Magnetic Recording (HAMR) media that consist of columnar FePt grains segregated by thin C grain boundaries. FePt/C multilayers with varied repeat units and FePt layer thicknesses (chosen to represent HAMR media grain sizes) were measured using Frequency-Domain Thermoreflectance to determine kth in the direction normal to the layers. The data suggest that when FePt grains are less than 8 nm in diameter, the in-plane kth for HAMR media is below 1 W/m-K and the anisotropy of kth (cross-plane/in-plane) will exceed 10.

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confidence: 99%

Experimental estimates of in-plane thermal conductivity in FePt-C granular thin film heat assisted magnetic recording media using a model layered system

Sharma

Ong

et al. 2013

Applied Physics Letters

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“…While current HDD based on CoPtCr-oxide granular film is expected to limit the maximum AD of 1.0-1.5 Tb/in 2 , heat-assisted magnetic recording (HAMR) media based on L1 0 FePt granular film is considered to extend the maximum AD over 4 Tb/in 2 owing to the high magnetocrystalline anisotropy of L1 0 ordered phase for FePt (K u ~ 7 × 10 7 erg/cm 3 ) [1][2][3]. In order to realize the L1 0 ordered FePt granular film as a high recording density medium, it is necessary to enhance the signal-tonoise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

Amorphous Cr-Ti Texture-inducing Layer Underlying (002) Textured bcc-Cr alloy Seed Layer for FePt-C Based Heat-assisted Magnetic Recording Media

Jeon¹,

Hinata

Saito

2016

Journal of Magnetics

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Cr 100-x Ti x amorphous texture-inducing layers (TIL) were investigated to realize highly (002) oriented L1 0 FePt-C granular films through hetero-epitaxial growth on the (002) textured bcc-Cr 80 Mn 20 seed layer (bcc-SL). Asdeposited TILs showed the amorphous phase in Ti content of 30 ≤ x (at%) ≤ 75. Particularly, films with 40 ≤ x ≤ 60 kept the amorphous phase against the heat treatment over 600 o C. It was found that preference of the crystallographic texture for bcc-SLs is directly affected by the structural phase of TILs. (002) crystallographic texture was realized in bcc-SLs deposited on the amorphous TILs (40 ≤ x ≤ 70), whereas (110) texture was formed in bcc-SLs overlying on crystalline TILs (x < 30 and x > 70). Correlation between the angular distribution of (002) crystal orientation of bcc-SL evaluated by full width at half maximum of (002) It is suggested that the reduction of (002) FWHM affects to the overlying MgO film as well as FePt-C granular film by means of the hetero-epitaxial growth.

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“…In fact, significant progress in HAMR has already been made, and each company in the HDD industry has plans to introduce HAMR technology into product within the next few years. In March 2012, Seagate Technology (Bloomington, MN, USA) has demonstrated a HAMR areal density of 1 Tb/in 2 [6], with a linear bit density of around 2 million bpi (bits per inch) [7]. This is about 55% higher than today's 620 Gb/in 2 in 3.5-inch hard drives.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic near-field transducer for heat-assisted magnetic recording

Zhou

Hammack³

et al. 2014

Nanophotonics

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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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HAMR Areal Density Demonstration of 1+ Tbpsi on Spinstand

Cited by 124 publications

References 12 publications

Experimental estimates of in-plane thermal conductivity in FePt-C granular thin film heat assisted magnetic recording media using a model layered system

Experimental estimates of in-plane thermal conductivity in FePt-C granular thin film heat assisted magnetic recording media using a model layered system

Amorphous Cr-Ti Texture-inducing Layer Underlying (002) Textured bcc-Cr alloy Seed Layer for FePt-C Based Heat-assisted Magnetic Recording Media

Plasmonic near-field transducer for heat-assisted magnetic recording

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