摘要
Currently, people investigating the magnetic properties of ferromagnets at low temperatures have found that there exists a class of magnetic alloys such as SmCo<sub>3.5</sub>Cu<sub>1.5</sub>, Sm（CoCuFeTi）<sub>6.8</sub>, Tb(Fe<sub>0.7</sub>Al<sub>0.3</sub>)<sub>2</sub>, Dy(Fe<sub>0.9</sub>Ga<sub>0.1</sub>)<sub>2</sub>, of which the curves of coercive force H<sub>c</sub> versus temperature T are logarithmic shapes at high temperatures and ap-
基金
Project supported by the National Natural Science Foundation of China
