Phy290 Magnetic Domains

what kind of magnetic material do we use today?

• diamagnetic

• anti ferromagnetic

• paramagnetic

• ferromagnetic

what is the temperature above which ferromagnetic materials lose their magnetic property?

• Newton’s temperature

• Curie temperature

• Einstein temperature

• becquerel temperature

Difference between Faraday effect and Kerr effect?

• Faraday works for rotation, Kerr for transmission

• both for rotation but Faraday for paramagnetic materials only

• Faraday works for transmission, Kerr for rotation

• both for transmission but Kerr for paramagnetic materials only

what is the faraday effect?

• the polarization of the light rotates

• the polarization of the light is inverted

• the polarization of the light becomes circular

• the polarization of the light becomes linear

what will we use for creating the external magnetic field?

• two magnets

• a solenoid

• a magnet

• a coil

what do we use for visualizing the magnetic domains?

• a polarizer and a density filter

• only one polarizer

• one polarizer and one analyzer

• one polarizer and one wave plate

we set an external magnetic field. we see that the image if totally bright (uniform). what does it mean?

• the magnetic domains are still there and their number is the same

• the magnetic domains disappear

• magnetic domains still there but their number is reduced by 50%

• magnetic domains are still there but their number reduced by 75%