I am interested in the effects of temperature on Permanent Magnets. I understand that Neodymium magnets lose -0.09 ~ -0.13% of Br/°C and can work stably under 80°C for low Hci Neodymium magnets. However, what happens to them just over this 80°C limit? Do they still have some magnetic strength to attract and repel? If they are cooled, do they retain their full strength or do they loss some strength?