What is clustered region of aligned magnetic atoms called?

Technically impossible . In a rock , ferromagnetism can create poles , but not in atoms .

Atoms cannot be magnetic . Molecules can be polar , which leads to Van der Waals links , but a region's molecule cannot become all lined in the same directions .

YouTube.com/watch?v=4VmMr9TWzY4">http://www.YouTube.com/watch?v=4VmMr9TWzY4

http://media-2.web.britannica.com/eb-media/65/265-004-9B256ADC.gif

Pretty simple , as a matter of fact .