Structure and magnetism of hcp-Co fine particles

被引：115

作者：

Sato, H ^{[1
]}

Kitakami, O ^{[1
]}

Sakurai, T ^{[1
]}

Shimada, Y ^{[1
]}

Otani, Y ^{[1
]}

Fukamichi, K ^{[1
]}

机构：

[1] TOHOKU UNIV,FAC ENGN,DEPT MAT SCI,SENDAI,MIYAGI 98077,JAPAN

来源：

JOURNAL OF APPLIED PHYSICS | 1997年 / 81卷 / 04期

关键词：

D O I：

10.1063/1.364041

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have synthesized hcp-Co fine particles with the average diameter of less than 50 nm by sputtering Co in a somewhat high inert gas pressure. A nearly perfect hcp phase can be stabilized by increasing sputtering gas pressure and decreasing sputtering power in contrast to conventional preparation conditions. Magnetic measurements have revealed the clear relation of coercivity with the volume ratio of hcp phase. That is, the increase in the hcp phase considerably enhances the coercivity. Appearance of the hcp phase seems to be related to the promotion of allotropic phase transformation in Co initiated by lattice defects within each particle. (C) 1997 American Institute of Physics.

引用

页码：1858 / 1862

页数：5

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