What is residual magnetic flux density Br?

What is permeance coefficient Pc?

Does magnetic force (Br) increase in accordance with the coefficients in the ranges of minus temperatures?

Do they demagnetize over time?

What is low temperature demagnetization?

What is the HAL production process?

Are there any differences in temperature characteristic coefficients depending on materials with Neodymium magnets? Also, how much do they fluctuate?