Near-Field Optical Transducer for Heat-Assisted Magnetic Recording for Beyond-10-Tbit/in<sup>2</sup> Densities

Ikkawi, R.; Amos, Nissim; Lavrenov, A.A.; Krichevsky, A.; Teweldebrhan, Desalegne; Ghosh, S. K.; Balandin, Alexander A.; Litvinov, Dmitri; Khizroev, Sakhrat

doi:10.1166/jno.2008.007

Cited by 19 publications

(10 citation statements)

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“…The latter is required in order to assess the feasibility of application of graphene multi-layers for the lateral hot-spot removal and other device-level thermal management applications. 20 Due to the increasing dissipation power density, switching speed and thermal resistance of the multi-layer structures, the device-level thermal management becomes important not only for conventional electronics but also for magnetic memory, 21 logic elements with alternative state variables, 22 three-dimensional and reconfigurable architectures 23 and optoelectronic devices. 24…”

Section: Discussionmentioning

confidence: 99%

Simulation of Heat Conduction in Suspended Graphene Flakes of Variable Shapes

Subrina¹,

Kotchetkov²

2008

Journal of Nanoelectronics and Optoelectronics

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Graphene is a novel material that reveals many remarkable properties. Academic and industry research groups around the globe are carrying out theoretical and experimental studies to discover and investigate characteristics of graphene. Due to its outstanding properties, graphene has a potential to revolutionize technology. Particularly, graphene was found to be one of the best known heat conductors [Balandin et al., Nano Lett. 8, 902 (2008)], which suggests that it can be used in nanoelectronic and optoelectronic devices as a heat spreader component. The extremely high thermal conductivity was found for single layer graphene, which consisted of one crystalline plane of sp 2bound carbon atoms. In that experiment a method of measuring G peak position of the Raman spectrum as a function of both the temperature of the graphene sample and the power of the heat source was used to compute the thermal conductivity. The sample in the experiment had approximately rectangular geometry and a simple model was used to extract the thermal conductivity under certain assumptions about the nature of the thermal transport. In this work we used finite-element simulations to model the heat spreading in graphene flakes of variable shapes. We also investigated how the thermal transport is influenced by the geometry of the heat source and flake width. We found that all mentioned factors impact heat propagation and have to be included in the experimental data extraction. The simulations also proved that for the rectangular geometry of the flake and specific conditions of the experiment, e.g., ratio of the flake width to the laser spot size, the simple one-dimensional model data extraction was adequate. The developed simulation procedure can be further used for investigation of thermal transport in graphene multi-layers and graphene-heat sink structures. The latter is required in order to study the feasibility of application of graphene multi-layers for the lateral hot-spot removal and other device-level thermal management applications.

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Section: Discussionmentioning

confidence: 99%

Simulation of Heat Conduction in Suspended Graphene Flakes of Variable Shapes

Subrina¹,

Kotchetkov²

2008

Journal of Nanoelectronics and Optoelectronics

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“…The bottom of the stage was illuminated by a xenon lamp (wavelength =150 -2000 nm) with millisecond energy pulses. The temperature of the opposite surface of the sample was monitored with a cryogenically cooled InSb infrared detector [62][63]. The design of the in-plane sample holder ensured that heat traveled ~5 mm inside rGO film along its plane, which is a much larger distance than its thickness, and thus, ensuring the inplane values for thermal diffusivity .…”

Section: Sample Preparation and Annealing Procedurementioning

confidence: 99%

Strongly Anisotropic Thermal Conductivity of Free‐Standing Reduced Graphene Oxide Films Annealed at High Temperature

Renteria

Ramirez

Malekpour

et al. 2015

Adv Funct Materials

510

323

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We investigated thermal conductivity of free-standing reduced graphene oxide films subjected to a high-temperature treatment of up to 1000°C. It was found that the hightemperature annealing dramatically increased the in-plane thermal conductivity, K, of the films from ~3 W/mK to ~61 W/mK at room temperature. The cross-plane thermal conductivity, K  , revealed an interesting opposite trend of decreasing to a very small value of ~0.09 W/mK in the reduced graphene oxide films annealed at 1000 o C. The obtained films demonstrated an exceptionally strong anisotropy of the thermal conductivity, K/K  ~ 675, which is substantially larger even than in the high-quality graphite. The electrical resistivity of the annealed films reduced to 1 / -19 /. The observed modifications of the in-plane and cross-plane thermal conductivity components resulting in an unusual K/K  anisotropy were explained theoretically. The theoretical analysis suggests that K can reach as high as ~500 W/mK with the increase in the sp 2 domain size and further reduction of the oxygen content. The strongly anisotropic heat conduction properties of these films can be useful for applications in thermal management.  Corresponding author (AAB): balandin@ee.ucr.edu ; web: http://ndl.ee.ucr.edu/ University of California -Riverside and Graphenea Inc. (2015) 2 | P a g e

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“…13 The thermal-wave travel time allowed us to measure the thermal diffusivity ␣. The thermal conductivity was determined as K = ␣C, where and C are the mass density and specific heat of the material, respectively.…”

Section: Experimental Techniques and Sample Preparationmentioning

confidence: 99%

Thermal properties of the optically transparent pore-free nanostructured yttria-stabilized zirconia

Ghosh

Teweldebrhan

Morales

et al. 2009

Journal of Applied Physics

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The authors report results of investigation of thermal conductivity of nanocrystalline yttria-stabilized zirconia. The optically transparent pore-free bulk samples were prepared via the spark plasma sintering process to ensure homogeneity. Thermal conductivity K was measured by two different techniques. It was found that the pore-free nanostructured bulk zirconia is an excellent thermal insulator with the room-temperature K∼1.7–2.0 W/m K. It was also shown that the “phonon-hopping” model can accurately describe specifics of K dependence on temperature and the grain size. The obtained results are important for optimization of zirconia properties for specific applications in advanced electronics and coatings.

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Near-Field Optical Transducer for Heat-Assisted Magnetic Recording for Beyond-10-Tbit/in² Densities

Cited by 19 publications

References 0 publications

Simulation of Heat Conduction in Suspended Graphene Flakes of Variable Shapes

Simulation of Heat Conduction in Suspended Graphene Flakes of Variable Shapes

Strongly Anisotropic Thermal Conductivity of Free‐Standing Reduced Graphene Oxide Films Annealed at High Temperature

Thermal properties of the optically transparent pore-free nanostructured yttria-stabilized zirconia

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Near-Field Optical Transducer for Heat-Assisted Magnetic Recording for Beyond-10-Tbit/in2 Densities

Cited by 19 publications

References 0 publications

Simulation of Heat Conduction in Suspended Graphene Flakes of Variable Shapes

Simulation of Heat Conduction in Suspended Graphene Flakes of Variable Shapes

Strongly Anisotropic Thermal Conductivity of Free‐Standing Reduced Graphene Oxide Films Annealed at High Temperature

Thermal properties of the optically transparent pore-free nanostructured yttria-stabilized zirconia

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Product

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Near-Field Optical Transducer for Heat-Assisted Magnetic Recording for Beyond-10-Tbit/in² Densities