一、引言 随着科学技术的飞跃发展,自动控制仪器仪表的应用也越来越广泛,要求也越来越高,随之对材料的性能要求也就越来越苛刻。对永磁材料来说,在某些领域中要求体积小、重量轻、性能高,笋且有的要求质地柔软等等。如上海交大研制的SJ—Ⅰ图书防盗系统中所应用的永磁敏感元件,要求性能好且质 I. INTRODUCTION With the rapid development of science and technology, the application of automatic control instrumentation is also more and more widely and the requirements are getting higher and higher. As a result, the performance requirements of materials are also more and more harsh. For permanent magnetic materials, in some areas require small size, light weight, high performance, bamboo shoot and some require soft texture and so on. Such as Shanghai Jiaotong University developed SJ-Ⅰ book anti-theft system used in permanent magnet sensitive components, requiring good performance and quality