Which of the applications below was **not** discussed this week in lecture as an example of nanomagnetism. Choose the single best answer.

In lecture 1, what two factors were mentioned as important in determining if a material is a ferromagnet? Choose the single best answer.

What are the scientific names used in lecture to describe the three regimes of ferromagnetic behavior as a function of size? Choose the single best answer.

The absence of this feature makes single domain magnets much harder to magnetize than larger magnetic structures. Choose the single best answer. [HINT: See 15 in lecture 2]

What are two strategies mentioned in lecture for moving beyond the superparamagnetic limit in magnetic recording media? Choose the single best answer.

In a magnetic separation, what is the role of the externally applied magnetic field? Choose the single best answer.

What is the unexpected process that happens to small (e.g. less than 50 nm diameter) nanoparticles in an external field of less than 0.5 Tesla that allows magnetic separation to be applied to their removal from solutions? Choose the single best answer.

In an MRI imaging experiment, what substance in the body is responsible for the signal? Choose the single best answer.

What type of nanoparticle was shown in lecture to be an effective T1 contrast agent? Choose the single best answer.

If you were creating a nanoparticle suitable for MRI targeting and cancer imaging, what diameter of particle (e.g. assume spherical) would be optimal? Please select this single best answer. HINT: See slide 80 in lecture 7 for a discussion.