Bringing Patterned Media to Production with Value Added Metrology
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1 Bringing Patterned Media to Production with Value Added Dean Dawson, Andrew S. Lopez Diskcon /IDEMA Conference, Session 6 September 24th, 2009
2 Overview Introduction AFM Scan Modes New Nanotrench Pattern Media Requirements Depth & Defects Imprint Wafer Requirements 3D Imprint Summary From Productive Research to Manufacturing Productivity Dimension Icon AFM with NanoTrench InSight 3DAFM 270 sites/hr
3 Wide Range of Data Storage Solutions Research Wafer CMP Wafer 3D Media Slider Dimension Icon Dimension AFP InSight 3DAFM Dimension Icon Vx200 PTR & Optical Profiler Failure & Defect Characterization CMP Wafer Trench Media R&D PTR Worlds Most Advanced AFM In-Line CMP In-Line 3D Media/BPM AFM - Golden Reference Widest range of AFM techniques Complete CMP Solution Non destructive 3D Resist & Alumina Optical - High throughput inline metrology
4 Advanced AFM Modes for TappingMode Non destructive, high resolution imaging Constant scan rate Tip lifetime>100 s sites Topography & Defects Deep Trench Mode Non-destructive high resolution depth metrology Adaptive scan rate matches sample structure. Tip lifetime>1000 s sites Production Depth & Sidewall Angle Critical Dimension AFM Non destructive, high resolution sidewall imaging Scanner servo s in X-Z & Y-Z Direction. Adaptive Scanning Tip Lifetime >1,000 sites CD, LER & Sidewall metrology SNL Probes 2009 Veeco Instruments Inc ideam-diskcon CNT Probes New CDAFM Probes
5 New NanoTrench Mode for DTM NanoTrench skillfully combines HarmoniX & TappingMode to create a powerful new AFM mode NanoTrench starts at (B) probe entering transition Data shows high resolution, precise depth metrology of BPM/DTM media features A B E F Lower Measurement Cost Enables small feature measurement with low cost SNL probes from Veeco Probes Significantly improves tip lifetime HarmoniX constantly monitors the tip surface interaction (B-C) C D Scan Direction SNL Probes
6 TappingMode Tip Lifetime Improperly Operated Tapping Mode 1 st Frame 20 th Frame Tip radius increase from 11 nm to 16 nm in 20 frames Properly Operated Tapping Mode 1 st Frame 20 th Frame Tip radius did not show any change Scan size 1.5 um for all the images, height scale is 100 nm
7 NanoTrench Tip Lifetime 1st Image Continuously scanning on the rough surface for 66 hours, hundreds of frames. Tip radius maintains 7.5 nm through out the process Nanotrench mode controls tip/surface interaction peak force directly with high accuracy. This force control assures that the interaction is well below fracture limit of Si tips.
8 Patterned Media Process Flow Substrate Substrate Substrate Substrate Substrate Process Steps: Magnetic layer deposition Patterning & Media Etch Gap fill Planarization Lubrication Steps: Roughness & Defects Depth, CD, SWA, LWR, Defects on Resist & Media Roughness, Depth & Defects Roughness, Defects, Adhesion Magnetic Properties Roughness, Friction, Defects Advanced metrology for resist profiles, trench profiles, planarization, defects, and material characterization
9 Patterned Media with Advanced AFM Modes Patterned media metrology requirements Small feature Depth, Sidewall Angle, CD Defect Review Residual resist thickness Dimension Icon AFM with NanoTrench TEM/ SEM cross-sectioning is labor-intensive and destructive and takes too much time AFM provides immediate feedback of results
10 Imprint Disk NanoTrench 300 nm x 150 nm 32 lines Low Cost SNL Probes demonstrate low probe wear over 90 images x 3 sites <1nm 1 st image 90 th image 6.5 nm 5.9 nm Repeatability Data Run Normalized Depth (nm) σ 0.74 NanoTrench & SNL Probes High Probe Lifetime 2009 Veeco Instruments Inc ideam-diskcon
11 Pattern Media Post NIL Probe Used SNL (silicon tip on silicon nitride cantilever) Scan Conditions: Nano Trench Mode Scan size: 300nm x 300nm 512 x 512 lines 0.44Hz Tests Conducted Capability Depth measurement 3D Profile Example
12 Bit Patterned Media CDAFM Mode Etch Structures Nested Space - Etch Precision Offset Slope TMP FMP InSight # InSight #103-Demo Space End - - Etch Precision Offset Slope TMP FMP InSight # InSight #103-Demo Line End - Etch Precision Offset Slope TMP FMP InSight # InSight #103-Demo Etch Etch Via Via Concave Concave Top Top & 3D 3D View View 60nm 60nm Via - Etch Precision Offset Slope TMP FMP InSight # InSight #103-Demo Resist Line End - Resist Precision Offset Slope TMP FMP InSight # InSight #103-Demo Via - Resist Precision Offset Slope TMP FMP InSight # InSight #103-Demo Precision of multiple feature sizes in one run 50nm-150nm Wafer ran 3x on each tool Includes process variation and variety of feature shapes Etched Etched Hole Hole --Convex Convex 50nm 50nm
13 22nm Nanoimprint Mask With 3DAFM nm nm BTD BTD = nm nm 32nm capable 22nm extendibility Nanoimprint Nanoimprint Sample Sample courtesy courtesy of of Dai Dai Nippon, Nippon, Japan Japan CDP15 CDP15 x x Long Long Probe Probe The Nanoimprint sample was scanned with a CDP-15 tip The scan demonstrates approximately 3nm bottom travel 3nm BTD & 15nm probe diameter = 18nm trench width The trenches are nominally 22nm top CD x 100nm deep CDP15C probe is available for advanced development work
14 Nanoimprint Linear Correlation: CDAFM Bottom CD to CDSEM CDAFM correlates to to CD CD SEM SEM
15 DTM Defect Review Imaging Many types of defects in media (physical, magnetic) Defects in manufacturing are a significant limiter to yield Automated import of defects Contamination/defects can be imaged & measured from imported defect review file
16 Veeco Providing Enabling Technology for Areal Density Growth Dimension AFP-DS CMP Cross Section of Head Write Pole InSight 3D-AFM PMR HD9800 Optical Profiler & Dimension Vx200-DS PTR & DLC Read Sensor InSight 3D-AFM Profile Dimension Icon AFM FA & Characterization
17 InSight 3DAFM Wafer InSight 3DAFM ABS ABS plane plane Depth sites/hr CD 100 Sites/hr Isolated 100nm Line 5 μm Width, 36 lines, Excellent Image stability
18 Principle of 3D AFM A flared tip follows the contour of features Probe is scanned by piezo X,Y, stage Data point spacing nm Undercut or re-entrant features can be measured 3D images is created by multiple 2D line scans Flared Flared tip tip enables enables measurements of of undercut undercut re-entrant re-entrant features features In a single scan the 3D AFM provides: Top, mid, and bottom CD Depth/Height Sidewall angle (left and right) Sidewall profile Line width roughness Sidewall roughness
19 TEM Level Profile Accuracy T.E.M. of multiple test lines 21 Average CD Bias (TEM - AFM) using TSE CD-Trident CD130SiN Bias Mid CD (nm) Mid CD (nm) Average Std Deviation Over-etched Over-etched Sample Sample for for Testing Testing Purposes Purposes Blue Blue Line Line is is the the Average Average 3DAFM 3DAFM Profile Profile TEM TEM Image Image Excellent Excellent Correlation Correlation to to TEM TEM with with 1.0nm 1.0nm Offset Offset data data sets. sets. Careful Careful selection selection of of TEM TEM & AFM AFM sites sites Tip Shape Extraction removes tip shape from measured profile Data shows excellent correlation to T.E.M. for Profile and CD bias within LER of sample Trident Probes
20 Damascene Trench Lithography Post-Etch Ru Deposition Probe to Probe Repeatability (3σ) CNP500 Probes demonstrate over measurements Critical Requirements Trench Profile Width, Depth, Sidewall Angle (SWA) Sidewall Roughness (SWR) Line Width Roughness (LWR)
21 PMR Pole Tapering and Edge Features: Critical Requirements Edge Profile Height Sidewall Angle Normalized Angle Summary Normalized Angle Pooled Repeatability (3σ) FIB Probe 2009 Veeco Instruments Inc ideam-diskcon CDAFM CDAFM Mode Mode with with deg deg Angled Angled FIB FIB Probe Probe
22 Summary New NanoTrench AFM Mode provides high resolution AFM metrology for Patterned Media on Dimension Icon AFM Depth metrology on BPM/DTM structures Low Noise Defect metrology 3DAFM metrology provides unique 3DAFM characterization and production monitoring of critical metrology Non-destructive direct measurements Delivers results within minutes without need for sample preparation or cross sectioning
23 THANK YOU
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