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The Maglab Presents: Magnetic Moments

The Maglab Presents: Magnetic Moments. Carlos R. Villa National High Magnetic Field Laboratory. NHMFL Overview. One of three national labs in the Southeast U.S. One of nine high magnetic field labs in the world Only one in western hemisphere Largest and highest powered in the world.

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The Maglab Presents: Magnetic Moments

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  1. The Maglab Presents:Magnetic Moments Carlos R. Villa National High Magnetic Field Laboratory

  2. NHMFL Overview • One of three national labs in the Southeast U.S. • One of nine high magnetic field labs in the world • Only one in western hemisphere • Largest and highest powered in the world

  3. Center for Integrating Research & Learning • Educational component of NHMFL’s grant • RET programs • 6 weeks • $3600 stipend • REU also available • K-12 education outreach • 9,000 students visited this school year • Professional development • Workshops and conferences

  4. Magnet Review • Gauss • Measurement of magnetic field • Named for Carl Friedrich Gauss • Tesla • Measurement of larger magnetic fields • Named for Nikola Tesla • 10,000 Gauss = 1 Tesla

  5. Magnetic Metals • Not all metals are magnetic • 3 Are naturally magnetic • Iron • Nickel • Cobalt • Exceptions to the rule • Gadolinium • Must be frozen

  6. Magnetite • Fe(II)Fe(III)2O4 • Naturally magnetic igneous rock • Usually found in marine sands and deserts • Largest US deposit in NY (Adirondacks) • Lodestone found In Arkansas • Different crystalline structure

  7. Magnetism • Motion of electrons create magnetic fields • In some atoms, spins cancel out • Pauli exclusion • Magnetic domains • In magnets: lined up • Whenever all electrons spin the same direction: magnetic field is produced

  8. Permanent Magnets • Electrons tend to line up in groups (Domains) • Domains reinforce other domains • Turn material magnetic • Examples: Refrigerator Magnets, Bar Magnets, Magnetite, Horseshoe Magnets, Hematite, etc… • Field can be lost • Curie Point • Electric Current • Degaussing • Bang It

  9. Temporary Magnets • Domains temporarily aligned • Will keep magnetic field until tampered • Examples: • Paperclips, scissors, staples, thumb tacks, pins, screwdrivers, refrigerator door, car doors, etc… • Anything that is magnetic, but will not keep its field

  10. Viewing Field Lines • Field viewers • Box photo frames • Iron filings • Use with paper • Clean-up can be a mess

  11. Drawing Field Lines • Seeing fields • Bar magnet • As many compasses as possible

  12. Magnaprobe

  13. Create A Compass • Allow it to float • Must turn freely • Needle • Petri dish • Coffee stirrer • Water • Permanent magnet • Magnetize an item

  14. Electricity and Magnetism • The two are so closely related • Where there is electricity, there is a magnetic field • Where there is a magnetic field, electricity can be created

  15. Creating Magnetism From Electricity • Electricity is the movement of electrons • Electrons flow in one direction • This alignment of electrons creates a magnetic field • Similar to electrons lining up in a permanent magnet • So every wire carrying electricity has a weak magnetic field around it (Try it) • Coiling the wire concentrates the magnetic field inside the coil

  16. Electromagnets • Materials • Copper wire • Iron rod • Battery • Extensions: • 2 batteries • In line? • Aluminum, wooden rod • Will they work?

  17. Electromagnets Extensions: • Right hand rule • Direction of field • Poles (Winding direction) • Use magnaprobe • Variables: • Neatness • Number of winds • Wire gauge • Battery strength • Temperature

  18. Bitter Plates

  19. Bitter Plates

  20. Iron In Our Food • Iron in cereal • Total • Baby food • Need a strong magnet • Neodymium

  21. A special solution of magnetic particles in a colloidal suspension whose flow can be controlled by magnets or magnetic fields. Ferrofluids

  22. Ferrofluids • Make your own: • Oil, petri dish, magnet • Please be careful • Iron filings: • Education Innovations • Post Apple Scientific • Actual ferrofluids available: • Carolina Biological • Educational Innovations

  23. Cow Magnets

  24. Additional Resources Stop Faking It: Electricity & Magnetism Bill Robertson Driving Force: The Natural Magic of Magnets James D. Livingston

  25. Additional Resources • http://education.magnet.fsu.edu • MagLab Alpha; Science, Optics, & You; other curriculum • MagLab audio slideshows • RET Program • K-12 Programs

  26. Thank You Carlos R. Villa National High Magnetic Field Laboratory villa@magnet.fsu.edu • 850-644-7191

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