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Properties of Electric Materials: Chapter 18

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Properties of Electric Materials: Chapter 18

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Questions and Answers

What is the defining characteristic of antiferromagnetic materials?

Adjacent magnetic moments align in the same direction

They achieve maximum magnetization at high temperatures

Adjacent magnetic moments align in opposite directions with equal magnitudes (correct)

They have no magnetic effect

Which material is cited as a classic example of antiferromagnetic material?

Iron (Fe)

Manganese oxide (MnO) (correct)

Cobalt (Co)

Nickel (Ni)

What is saturation magnetization?

The maximum magnetic moment per unit volume a material can achieve (correct)

The point at which a material loses its magnetic properties

The resistance of a material to magnetization

The minimum magnetic moment per unit volume a material can achieve

What happens to the magnetic behavior of a material as temperature rises?

Thermal motion disrupts alignment, counteracting coupling forces between adjacent atomic dipoles Signup and view all the answers

In what applications are antiferromagnetic materials commonly used?

Sensors and memory devices Signup and view all the answers

Which chapter of the course covers the topic of Electrical Properties?

(Chapter 18) Electrical Properties Signup and view all the answers

What is the Curie temperature (𝑻𝒄) defined as?

The temperature at which magnetization drops to zero Signup and view all the answers

What happens to ferro- or ferrimagnetic materials above the Curie temperature (Tc)?

They become paramagnetic Signup and view all the answers

What is a key characteristic of hysteresis in ferro- and ferrimagnets?

Magnetization varies with H, creating a hysteresis loop Signup and view all the answers

Why do transformer cores often use ferromagnetic materials?

To minimize core losses by understanding hysteresis behavior Signup and view all the answers

What happens to the magnetization curve during reversal in hysteresis loop?

It doesn't retrace, indicating hysteresis effects Signup and view all the answers

What is the state of ferro- and ferrimagnetic materials below the Curie temperature (Tc)?

They consist of small-volume regions called domains Signup and view all the answers

What is the significance of the origin in the hysteresis loop?

'The initial magnetization is shown Signup and view all the answers

How does the magnetization of an entire ferro- or ferrimagnetic material behave?

'Magnetization is a vector sum of all domains' Signup and view all the answers