To demagnetize a saturated magnet, a certain magnetic field must be applied, and this threshold depends on coercivity of the respective material. Hard materials have high coercivity, whereas soft materials have low coercivity.aterials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone.
Atahualpa was the last Inca ruler, executed by Spanish conquistador Francisco Pizarro in 1533, marking the end of the Inca empire.orn c. 1502, Atahualpa was the younger son of Inca ruler Huayna Capac. At Huayna's death, the kingdom was divided between his sons. This lead to a bloody civil war, which Atahualpa won in 1532.
It became the capital and most important city in the Spanish Viceroyalty of Peru. In 1532, a group of Spanish conquistadors led by Francisco Pizarro defeated the Inca ruler Atahualpa and took over his Empire. The Spanish government made Pizzaro governor of the lands he conquered.