Lessons+-+Macro-scale+magnets+to+nanomagnets

1. Bring in bar and horseshoe magnets. Play around with the properties of attraction and repulsion. 2. Use magnets to show how combining magnets can use to make the magnetism stronger. 3. Show how magnets can be broken into smaller pieces that are still magnetic. 4. Show how a small electromagnet works. 5. Talk about the Earth's magnetic field, and illustrate it with a commercial compass. 6. Create a compass with a pin, cork, and a dish of water. 7. Illustrate magnetic field lines with a strong magnet and iron filings in a transparent container. 8. Use an old video monitor and a very strong magnet to show how the monitor beam can be deflected. 9. Explain how magnetic tape is used to store data in cassette tapes and do something with the magnetic head of a tape player, etc. 10. Talk about other uses of magnets (computer hard drives, motors, generators, credit cards, etc.). 11. Talk about different elemental metals, and how three specific elemental metals are magnetic. 12. Talk about micro/nanomagnets that are used in computers (floppy disks, tape drives, hard drives, MRAM, Nanomagnet logic, etc.). 13. Talk about and show experimental results about single domain and multi-domain magnets. 14. Talk about how electron spin causes magnetism, and talk about giant magnetoresistance.