History of Magnetism

2, North, South

All magnets have ___ poles: _____ and _____

Geographic North Pole

(1)

Magnetic South Pole

(2)

Hans Oersted

The Danish Physicist to notice that compass needle moved whenever current flowed in a nearby wire.

Reported that an electric current can somehow cause a magnetic force in the 1820 meeting of the French Academy of Science.

André-Marie Ampère

Physicist who studied the forces exerted by one current on another.

Proposed that electric current is the source to all magnetic phenomena.

Developed a model for permanent magnets by suggesting that such matter contains microscopic current loops that are somehow aligned when a material is magnetized.

François Arago

The physicist to find out that iron could be magnetized by current

Humphry Davy

The physicist to discover that a magnet exerts a force on a wire carrying an electrical current.

Michael Faraday

Physicist to find out that the relative motion of a magnet and a metallic wire induced current in the wire.

Showed that a current has a magnetic field and a magnet can generate electric current.

the alignment of the spinning electrons

Permanent magnets are created by…

Giant magnetoresistance

Weak changes in a magnetic field in a thin film of iron and chromium that can bring much larger changes in resistance.

Yes, it is true

Is it true that the Giant magnetoresistance can allow us to record the information magnetically based on the direction in which the iron layer is magnetized.

Albert Fert and Peter Grunberg

French and German physicists who won the 2007 Nobel Prize in Physics to discover Giant Magnetoresistance and its application to the digital storage.

Generators

__________ whether producing hydroelectric power or running bicycle lights, using magnetic fields