  When magnets are fashioned into nanoscale elements, they exhibit a wide
variety of phenomena replete with rich physics and the lure of tantalizing
applications. In this topical review, we discuss some of these phenomena,
especially those that have come to light recently, and highlight their
potential applications. We emphasize what drives a phenomenon, what undergirds
the dynamics of the system that exhibits the phenomenon, how the dynamics can
be manipulated, and what specific features can be harnessed for technological
advances. For the sake of balance, we point out both advantages and
shortcomings of nanomagnet based devices and systems predicated on the
phenomena we discuss. Where possible, we chart out paths for future
investigations that can shed new light on an intriguing phenomenon and/or
facilitate both traditional and non-traditional applications.
