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.
Atahualpa was the last ruler of the Incan empire and was killed by the Spanish conquistador Francisco Pizarro in 1533. Atahualpa is perhaps best known for providing a room full of gold and silver as his ransom for the Spanish, though they still executed him.tahualpa invited the Spanish explorers, led by Francisco Pizarro, to his camp since there was less than 200 of them. Atahualpa entered on a litter with his unarmed escorts, and the Spanish ambushed him and slaughtered his escorts.