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.
This was likely smallpox brought by the Spanish conquistadors. A large portion of the Inca population will die from smallpox and other diseases over the next several years. 1525 AD-The sons of Emperor Huayna, Atahualpa and Huascar, fight over the crown. The Inca Empire fights a civil war for the next five years. 1532 AD-Atahualpa defeats Huascar and becomes the emperor. At the same time, Spanish conquistador Francisco Pizarro arrives in Peru. Pizarro captures Atahualpa and holds him for ransom.