Amplitude Dependence of the Lateral-Vibration Wear Test for Perpendicular Recording Magnetic Disks Treated by Heat Curing

Surface & Interface Analysis

Hashizume

Wakatsuki

2006

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Carbon and boron nitride nanoperiod (C/BN) n multilayer films were deposited by bias radio frequency (RF) sputtering. It was proposed that using the lateral modulation friction force microscopy technique (LM-FFM), a nanoprocessing removal by mechanical action was performed on the nanoperiod (C/BN) n multilayered films with electroconductive diamond tips. It was found that the amplitude and phase of the tip cantilever torsion due to friction force between the tip and the sample surface varied with an increase in loading force when the film was processed with vibration. Since the amplitude variation obtained after this processing was correlated with the frictional force of each layer, the result that the amplitude varied with an increase in the processing depth indicated the nanostructure of this multilayer film. This suggested that the LM-FFM method could perform nanoprocessing and microstructure analysis. As a result, the structure of the 2-nm-period multilayer film was experimentally confirmed to consist of the C-layer, the interface, and the BN layer by this method.

Section: Processing Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoprocessing and evaluation of carbon and boron nitride nanoperiod multilayer films by lateral force modulation method

Surface & Interface Analysis

Hashizume

Wakatsuki

2006

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“…The sample was then repeatedly scanned by the same tip at a load of 10 nN, a scanning speed of 1.5 µm/s, and a scanning area of 1.5 × 1.5 or 3 × 3 µm 2 . The LM-FFM data consists of the output of 256 (pixels) × 256 (lines) in the observation area and provides simultaneous measurement values of the surface topography and frictional force [27,30]. Nanoprocessing was performed with and without applying an additional lateral vibration to samples, respectively, with the aim of improving the processing efficiency and surface flatness.…”

Section: Micro-electro-mechanical Processingmentioning

confidence: 99%

Nano- and Macrotribological Properties of Nanoperiod Multilayer Films Deposited by Bias Sputtering

Journal of Nanotechnology

Wang

2012

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Carbon and boron nitride nanoperiod (C/BN)n, boron nitride and carbon (BN/C)n, carbon nitride and boron nitride nanoperiod (CN/BN)n, and boron nitride and carbon nitride (BN/CN)n ]multilayer films with a 4-nm-period multilayer structure were deposited by bias radio frequency (RF) sputtering. The substrate used for deposition was repeatedly positioned opposite graphite and boron nitride targets. Both the nanoindentation hardness and microwear resistance of the multilayer (CN/BN)n and (BN/CN)n films changed with the layer period. The multilayer films with a 4 nm period had the highest hardness and microwear resistance. The processing characteristics of the (C/BN)n and (BN/C)n films with a 4-nm-period multilayer structure were investigated using a conductive atomic force microscope (AFM) with force modulation, which permits the quantitative recording of current and frictional force as functions of applied force. The results of processing indicated that friction and surface-current measurements are effective methods of investigating multilayer nanostructural surfaces and that the method proposed in this study for micro-electro-mechanical processing systems has high precision.

“…Understanding the dynamic behavior of lubricants on magnetic disks can clarify the lubrication mechanism at the head-disk interface. Scanning probe microscopies such as atomic force microscopy (AFM) have proven useful for this purpose [10][11][12][13][14]. The lubricating properties of lubricant-coated magnetic disks and dynamics of the lubricants behavior can be evaluated by force modulation AFM [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The lubricating properties of lubricant-coated magnetic disks and dynamics of the lubricants behavior can be evaluated by force modulation AFM [10][11][12]. Deformation before and after nanowear testing and the state of the lubricant can also be evaluated [13,14]. Lateral force modulation friction testing can evaluate the effect of a lubricant's retention and replenishment on its nanowear properties.…”

Section: Introductionmentioning

confidence: 99%

Improving the Friction Durability of Magnetic Head-Disk Interfaces by Thin Lubricant Films

Suzuki

Journal of Nanomaterials

2016

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Nanowear and viscoelasticity were evaluated to study the nanotribological properties of lubricant films of Z-tetraol, D-4OH, and A20H, including their retention and replenishment properties. For A20H and thick Z-tetraol-coated disks, the disk surface partially protrudes, and the phase lag (tan ) increases with friction. This result is consistent with replenishment of the lubricant upon tip sliding. For the D-4OH-coated disk, the tan value decreases with tip sliding, similar to the case for the unlubricated disk. The durability of the lubricant-coated magnetic disks was then evaluated by load increase and decrease friction tests. The friction force of the unlubricated disk rapidly increases after approximately 30 reciprocating cycles, regardless of the load. The lubrication state can be estimated by mapping the dependence of friction coefficient on the reciprocating cycle number and load. The friction coefficient can be classified into one of four areas. The lowest friction area constitutes fluid lubrication. The second area constitutes the transition to mixed lubrication. The third area constitutes boundary lubrication. The highest friction of the fourth area results from surface fracture. The boundary lubricating area of the A20H lubricant was wide, because of its good retention and replenishment properties.