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The Mag Lab: Magnets is What We Do - PowerPoint PPT Presentation


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Carlos R. Villa October 24, 2008 FAST Conference. 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. NHMFL Overview. User Laboratory

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carlos r villa october 24 2008 fast conference
Carlos R. Villa

October 24, 2008

FAST Conference

nhmfl overview
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
nhmfl overview1
NHMFL Overview
  • User Laboratory
    • Over 800 User Visits (2005)
    • NSF Funded
    • Research Free To Scientist
  • Research In Many Fields (Not Just Magnets!!)
    • Biology, Chemistry, Biomedical, Geology, Engineering, Geochemistry, Materials Science, Physics, Microscopy…
slide4

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
slide5

Refrigerator Magnet: .03 T

  • Earth’s Magnetic Field: .000045 T
  • Person’s Magnetic Field: 3 x10-13 T
  • Junkyard Magnet: 1 T
  • MRI Magnet: 2-3 T
slide6

NHMFL ICR Magnet: 9.4 T

    • Ionic Cyclotron Resonance
  • NHMFL 900 Mhz: 21 T
    • Nuclear Magnetic Resonance
  • NHMFL Resistive Magnet: 20-35 T
  • NHMFL Hybrid Magnet: 45 T
    • Resistive And Superconducting
  • NHMFL Pulse Magnet: 65 T
    • Not Continuous Field
slide7

Not All Metals Are Magnetic

  • 3 Are Naturally Magnetic
    • Iron
    • Nickel
    • Cobalt
  • Exceptions To The Rule
    • Gadolinium (Must Be Frozen)
slide8

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
slide9

Electron Configuration

    • Normally Scattered
  • Magnetic Domains
    • In Magnets: Lined Up
  • Whenever You Get Electrons All Pointing The Same Direction, A Magnetic Field Is Produced Around That Item
slide10

Electrons Are Naturally Aligned Pointing The Same Direction

  • Field Will Stay Until Destroyed
    • Curie Point
    • Electric Current
      • Degaussing
    • Bang It
      • Examples: Refrigerator Magnets, Bar Magnets, Magnetite, Horseshoe Magnets, Hematite, Buzz Stones, etc…
slide11

Electrons Are Temporarily Aligned

  • Will Keep Magnetic Field Until Tampered
    • Examples:
      • Paperclips, Scissors, Staples, Thumb Tacks, Push Pins, Screwdrivers, Refrigerator, Car Doors, etc…
      • Anything that is magnetic, but will not keep its field
slide12

Field Viewers

    • Box Photo Frames
  • Iron Filings
    • Use With Paper
    • Clean-up Can Be A Mess
slide13

One Bar Magnet

  • As Many Compasses As You Can Gather
slide15

Magnetize An Item

  • Allow It To Float
    • Must Turn Freely
    • Needle
    • Petri Dish
    • Coffee Stirrer
    • Water
    • Permanent Magnet
slide16

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
slide17

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
slide18

Materials

    • Copper Wire
    • Iron Rod
    • Battery
  • Extensions:
    • 2 Batteries
      • In Line?
    • Aluminum, Wooden Rod
      • Will They Work?
slide19

Right Hand Rule

    • Direction Of Field
  • Poles (Winding Direction)
    • Use Magnaprobe
  • Variables:
    • Neatness
    • Number Of Winds
    • Wire Gauge
    • Battery Strength
    • Temperature
slide23

Iron In Cereal

    • Total
    • Baby Food
  • Need A Strong Magnet
    • Neodymium
ferrofluids
A Special Solution Of Magnetic Particles In A Colloidal Suspension Whose Flow Can Be Controlled By Magnets Or Magnetic Fields. Ferrofluids
ferrofluids1
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
slide28

When an emf is generated by a change in magnetic flux according to Faraday\'s Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it.

slide31

Superconductors Exhibit Two Distinct Properties

    • Zero Resistance
    • Perfect Diamagnetism
slide32

Diamagnetic Behavior Is Limited

    • YBCO Works Well
      • Kit Available From Colorado Superconductor Inc.
additional resources
Additional Resources
  • Driving Force
    • The Natural Magic of Magnets
    • James D. Livingston
  • NSTA Press: Stop Faking It
    • Electricity and Magnetism
additional resources1
Additional Resources
  • http://education.magnet.fsu.edu
    • MagLab Alpha Download
  • K-12 Programs
  • RET Program
slide35

Business Cards

    • Please Do Not Hesitate To Contact Me With Questions, Ideas, Suggestions…
  • Free Pencils In The Back
  • Free Magnets Too!
slide36
Carlos R. Villa

K-12 Education Outreach Coordinator

National High Magnetic Field Laboratory

[email protected] 850-644-7191

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