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Prepared by: Shashidhar Reddy .Y Dept. of Electrical and Computer Engineering

ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Magneto resistive sensors. Prepared by: Shashidhar Reddy .Y Dept. of Electrical and Computer Engineering Utah State University E: ; T: ( 435)797-; F: (435)797-3054 (ECE Dept.) W: http://. 3/10/2006.

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Prepared by: Shashidhar Reddy .Y Dept. of Electrical and Computer Engineering

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  1. ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Topic: Magneto resistive sensors Prepared by: Shashidhar Reddy .Y Dept. of Electrical and Computer Engineering Utah State University E: ; T: (435)797-; F: (435)797-3054 (ECE Dept.) W: http:// 3/10/2006

  2. Conventional Vs Magnetic sensing ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  3. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  4. MAJOR APPLICATIONS ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  5. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  6. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  7. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  8. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  9. MAGNETIC SENSOR APPLICATIONS ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  10. BASIC WORKING OF MR SENSORS ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  11. Magnetization M R=R┴+ΔRAMRcos2 θ θ CurrentI Anisotropic magnetoresistive (AMR) sensor The theory of the AMR sensor is based on the complex ferromagnetic process in a thin film Magnetoresistance variation with angle between M and I AMR ratio for typical ferromagnetic materials at room temperature is around 1-3% ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  12. Obtaining parallel, antiparallel magnetic alignment • pinned sandwiches • Consist of two magnetic layers, soft layer and hard layer • Anti ferromagnetic multilayer • Consist of multiple repetitions of alternating magnetic and nonmagnetic layers • The polarized conduction electrons cause antiferromagnetic coupling between magnetic layers • Spin valves • An additional layer of an antiferromagnetic material is provided on the top or bottom ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  13. Giant magnetoresistive (GMR) sensor Two different ferromagnetic materials sandwiched by a thin conduction layer ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  14. Antiferromagnetic multilayers ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  15. Use of GMR in hard drive read head ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  16. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  17. FEATURES OF A GMR • The key structure in GMR materials is a spacer layer of a non-magnetic metal between two magnetic metals . • The overall resistance is relatively low when the layers were in parallel alignment and relatively high when in anti-parallel alignment. For his pioneering work in GMR, Parkin won the European Physical Society's prestigious 1997 Hewlett-Packard Europhysics Prize along with Gruenberg and Fert. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  18. WORKING OF AN MR HEAD Basic hard Disk set up ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  19. HARD DISK HEAD SETUP ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  20. MR SENSOR AS HEAD MR HEAD BIT ON HDD MAGNITUDE OF RESISTANCE CHANGE CHANGE IN RESISTANCE ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  21. GMR SENSOR AS A HEAD(More sensitive than an MR head) LAYERS OF GMR SENSOR HIGHER RESISTANCE CHANGE IN A GMR ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  22. Decrease in GMR resistance as the bit passes beneath ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  23. Medium Resistance ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  24. High Resistance ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  25. ADVANTAGES OF A GMR The increased signal offered in the GMR allows more information to be stored on a hard disk. This translates into very large capacity hard drives that can be made cheaper and more reliable. ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  26. Parameters for GMR sensor • Magnetic layers: 4~6 nm • Conductor layer 3~5 nm in sandwich structure • This thickness is critical in antiferromagnetic multilayer GMR sensors, typically 1.5~2 nm • Switching field 3~4 KA/m (35~50 Oe) for sandwich structure and 250 for multilayer structures ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  27. REFERENCE • http://www.stoner.leeds.ac.uk/research/gmr.htm • http://www.ornl.gov/info/ornlreview/v30n3-4/giant.htm • http://www.pcguide.com/ref/hdd/ • http://www.howstuffworks.com/hard-disk.htm • http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/info/comp/conduct/conduct/conduct.htm ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

  28. To explore further • http://www.research.ibm.com/research/gmr.html • http://www.research.ibm.com/research/demos/gmr/cyberdemo3.htm • http://mrsec.wisc.edu/Edetc/cineplex/GMR/index.html ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators

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