Hi Shikalgar!

Temperature at which certain magnetic materials undergo a sharp change in their magnetic properties is called as curie point which is also known as curie point. This temperature is named after scientist Pierre Curie (https://www.britannica.com/biography/Pierre-Curie) . For common magnetic mineral magnetite the curie point 570 °C /1,060 °F and for iron it is 770 °C /1,418 °F . The highest curie point is noted for cobalt i.e,1,121 °C /2,050 °F .

Hope this helps.

Thankyou!