The magnetic domain structure of Fe14Nd2B single crystals between 135 and 4K and the low-temperature magnetization reversal process in Fe-Nd-B permanent magnets

The magnetic domain structure of Fe14Nd2B single crystals has been studied from room temperature down to 4.2 K by means of the magneto-optical Kerr ef fect. It was found that the coercivity of different domain walls essentiall y depends on their type and orientation. The general expressions for the do main wall energy density gamma have been performed for Fe14Nd2B compounds i n the low-temperature region. The role of the new domain wall types in the low-temperature magnetization reversal process in Fe-Nd-B permanent magnets is discussed. (C) 1999 Elsevier Science B.V. All rights reserved.