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.
Land of the Four Quarters or Tahuantinsuyu is the name the Inca gave to their empire. It stretched north to south some 2,500 miles along the high mountainous Andean range from Colombia to Chile and reached west to east from the dry coastal desert called Atacama to the steamy Amazonian rain forest.ith the arrival from Spain in 1532 of Francisco Pizarro and his entourage of mercenaries or conquistadors, the Inca empire was seriously threatened for the first time. Duped into meeting with the conquistadors in a peaceful gathering, an Inca emperor, Atahualpa, was kidnapped and held for ransom.