High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization—Progress and Challenges

Ju, Ganping; Peng, Yingguo; Chang, Eric K. C.; Ding, Yunfei; Wu, Alexander Q.; Zhu, Xiaobin; Kubota, Yukiko; Klemmer, T. J.; Amini, Hassib; Gao, Li; Fan, Zhaohui; Rausch, Tim; Subedi, Pradeep; Ma, Mengyu; Kalarickal, Sangita S.; Rea, Chris; Dimitrov, Dimitar; Huang, Pin-Wei; Wang, Kangkang; Chen, Xi; Peng, Chao; Chen, Weibin; Dykes, J. W.; Seigler, Michael A.; Gage, Edward C.; Chantrell, R.W.; Thiele, Jan-Ulrich

doi:10.1109/tmag.2015.2439690

Cited by 82 publications

(31 citation statements)

References 38 publications

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“…allows us to narrow the bit transitions, ultimately yielding smaller bits. First working devices with an AD of 1 Tbit=in 2 [5] in 2013 and 1.4 Tbit=in 2 [6] in 2015 proved the potential of HAMR. Future hard disk drives based on granular media are hoped to reach ADs of up to 4 Tbit=in 2 [7][8][9].…”

Section: Introductionmentioning

confidence: 97%

Noise Reduction Based on an Fe−Rh Interlayer in Exchange-Coupled Heat-Assisted Recording Media

et al. 2017

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High storage density and high data rate are two of the most desired properties of modern hard disk drives. Heat-assisted magnetic recording (HAMR) is believed to achieve both. Recording media, consisting of exchange-coupled grains with a high and a low T C part, were shown to have low dc noise-but increased ac noise-compared to hard magnetic single-phase grains like FePt. We extensively investigate the influence of an Fe-Rh interlayer on the magnetic noise in exchange-coupled grains. We find an optimal grain design that reduces the jitter in the down-track direction by up to 30% and in the off-track direction by up to 50%, depending on the head velocity, compared to the same structures without FeRh. Furthermore, the mechanisms causing this jitter reduction are demonstrated. Additionally, we show that, for short heat pulses and low write temperatures, the switching-time distribution of the analyzed grain structure is reduced by a factor of 4 compared to the same structure without an Fe-Rh layer. This feature could be interesting for HAMR use with a pulsed laser spot and could encourage discussion of this HAMR technique.

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Section: Introductionmentioning

confidence: 97%

Noise Reduction Based on an Fe−Rh Interlayer in Exchange-Coupled Heat-Assisted Recording Media

et al. 2017

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“…Due to the success of energy, assisted writing technologies including heat-assisted magnetic recording (HAMR) and microwave-assisted magnetic recording (MAMR), the new technologies of hard disk drive (HDD) are close to commercialization. The writ ability issue of trilemma effect in perpendicular magnetic recording (PMR) is overcome and the high magnetocrystalline anisotropy material, for example, the (001) textured L1 0 FePt film (K u = 5 × 10 7 erg/cm 3 ) is suitable for next generation HAMR media which is expected to increase the areal density in hard disk drives beyond 2 Tbit/in 2 [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of an MgTiTaON Inserted Layer on Magnetic Properties and Microstructure of FePtAgC Films

et al. 2019

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The FePt film above 10 nm critical lattice relaxation thickness was prepared and the ultrathin MgTiTaON layer was interleaved in between FePt film and the multilayer stack is FePt(6 nm)/[MgTiTaON(1 nm)/FePt(4 nm)]2. Next, the FePt films were co-sputtered with (Ag, C) segregants during deposition and the layer stacks is FePt(6 nm)(Ag, C)(x vol %)/[MgTiTaON (1 nm)/FePt(4 nm)(Ag, C) (x vol %)]2 (x = 0, 10, 20, 30, 40). After high temperature deposition at 470 °C, the granular FePt(Ag, C, MgTiTaON) film illustrated perpendicular magnetization and the out-of-plane coercivity (Hc) was increased with (Ag, C) segregants and the highest Hc is 18.3 kOe when x = 40. From cross-section images, the FePt layer are more continuous with 0 and 10 vol% (Ag, C) segregants and changed to an island structure when the (Ag, C) segregants increase to 20–40 vol %. The FePt grains were grown in separated islands in 20, 30 vol % (Ag, C) and changed to dense columnar-like morphology in 40 vol%. The second nucleated grains which contribute the in-plane magnetization are found in FePt (Ag, C) (40 vol %) film. The FePt islands are reached by inserting the ultrathin MgTiTaON layer and the island heights of FePt(Ag, C) (30, 40 vol %) are around 31–38 nm and the aspect ratios are 0.6–0.8.

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“…Nanofocusingthe process of concentrating light to dimensions below the conventional diffraction limithas been utilized in a wide variety of practical applications [1,2], and is currently an enabling technology for the development of a data storage process known as heat-assisted magnetic recording (HAMR) [3]. The latest high-capacity hard disk drives (HDDs) from Seagate and Western Digital Corporation have areal densities up to 1.4 Tb/in 2 [4][5][6]. Studies have shown that HAMR may achieve areal memory density up to 4 Tb/in 2 or even 5 Tb/in 2 in the next few years [7].…”

Section: Introductionmentioning

confidence: 99%

Effective heat dissipation in an adiabatic near-field transducer for HAMR

Zhong¹,

Flanigan²,

Abadía³

et al. 2018

Opt. Express

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To achieve a feasible heat-assisted magnetic recording (HAMR) system, a near-field transducer (NFT) is necessary to strongly focus the optical field to a lateral region measuring tens of nanometres in size. An NFT must deliver sufficient power to the recording medium as well as maintain its structural integrity. The self-heating problem in the NFT causes materials failure that leads to the degradation of the hard disk drive performance. The literature reports NFT structures with physical sizes well below 1 micron which were found to be thermo-mechanically unstable at an elevated temperature. In this paper, we demonstrate an adiabatic NFT to address the central challenge of thermal engineering for a HAMR system. The NFT is formed by an isosceles triangular gold taper plasmonic waveguide with a length of 6 µm and a height of 50 nm. Our study shows that in the full optically and thermally optimized system, the NFT efficiently extracts the incident light from the waveguide core and can improve the shape of the heating source profile for data recording. The most important insight of the thermal performance is that the recording medium can be heated up to 866 K with an input power of 8.5 mW which is above the Curie temperature of the FePt film while maintaining the temperature in the NFT at 390 K without a heat spreader. A very good thermal efficiency of 5.91 is achieved also. The proposed structure is easily fabricated and can potentially reduce the NFT deformation at a high recording temperature making it suitable for practical HAMR application.

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High Density Heat-Assisted Magnetic Recording Media and Advanced Characterization—Progress and Challenges

Cited by 82 publications

References 38 publications

Noise Reduction Based on an Fe−Rh Interlayer in Exchange-Coupled Heat-Assisted Recording Media

Noise Reduction Based on an Fe−Rh Interlayer in Exchange-Coupled Heat-Assisted Recording Media

Influence of an MgTiTaON Inserted Layer on Magnetic Properties and Microstructure of FePtAgC Films

Effective heat dissipation in an adiabatic near-field transducer for HAMR

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