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Ferrimagnetism: Quiz


Question 1: Ferrimagnetic materials have high ________ and have anisotropic properties.

Question 2: However, there is sometimes a temperature below the Curie temperature at which the two sublattices have equal moments, resulting in a net ________ of zero; this is called the magnetization compensation point.
MagnetismMaxwell's equationsMagnetic momentMagnetic field

Question 3: This happens when the sublattices consist of different materials or ________ (such as Fe2+ and Fe3+).
Lithium-ion batteryIonHalf cellElectrolyte

Question 4: This compensation point is observed easily in ________ and rare earth - transition metal alloys (RE-TM).

Question 5: In physics, a ferrimagnetic material is one in which the ________ of the atoms on different sublattices are opposed, as in antiferromagnetism; however, in ferrimagnetic materials, the opposing moments are unequal and a spontaneous magnetization remains.
ElectromagnetismMaxwell's equationsMagnetic fieldMagnetic moment

Question 6: Ferrimagnetic materials are like ________ in that they hold a spontaneous magnetization below the Curie temperature, and show no magnetic order (are paramagnetic) above this temperature.
Magnetic fieldCobaltFerromagnetismIron

Question 7: Furthermore, ferrimagnets may also exhibit an angular momentum compensation point at which the ________ of the magnetic sublattices is compensated.
Rigid bodyForceAngular momentumEnergy

Question 8: As a particular example, a ________ signal circularly polarized in the same direction as this precession strongly interacts with the magnetic dipole moments; when it is polarized in the opposite direction the interaction is very low.
MicrowaveKu bandRadio wavesX-ray

Question 9: Some ferrimagnetic materials are YIG (yttrium iron garnet) and ferrites composed of iron oxides and other elements such as ________, cobalt, nickel, manganese and zinc.


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