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据英国《金属文摘》1991年11月号报道,美国公布了一项各向异性稀土磁性材料制造新工艺专利(专利号US4933059)。该材料是用溅射技术制备的,在组织结构上和磁性上都具有各向异性。其成分可用化学式(R_(1-a)O_a)_bM_1表示。其中R表示稀土元
According to the British “Metal Abstracts” November 1991 report, the United States announced a new anisotropic rare earth magnetic material manufacturing process patents (Patent No. US4933059). The material is prepared by sputtering techniques and is anisotropically both structurally and magnetically. Its composition can be chemical formula (R_ (1-a) O_a) _bM_1 said. Where R represents a rare earth element