组织结构对Co-Ni-P薄膜形貌和磁性的影响

化学镀 Co- Ni- P薄膜镀态下为非晶态结构 ,表面较为平整 ;经 30 0℃× 1 h热处理 ,发生了晶化转变 ,表面由“圆锥峰“所构成 ;随加热温度的提高 ,镀层析出了 Co2 P相 ,并发生了由密排六方结构的α- Co向面心立方结构的β- Co的同素异构转变。非晶态 Co- Ni- P薄膜的矫顽力较低 ,矩形比较高 ;薄膜向晶态转变时 ,矫顽力和矩形比皆呈上升趋势 ;50 0℃× 1 h热处理 ,薄膜由α- Co和 Co2 P相构成时 ,且在晶界上偏聚较多磷的影响下 ,矫顽力和矩形比的值达到最高 ;温度继续升高 ,晶粒长大 ,第二相粗化时 ,薄膜的矫顽力和矩形比都减小。化学镀 Co- Ni- P薄膜具有优秀的高密度垂直记录特性。

Effect of Structure on Surface Morphology and Magnetic Recording Properties of Electroless Co-Ni-P Thin Films

Electroless Co-Ni-P thin film as-deposited was amorphouspossessing smooth surface. The film was crystallized after heat treatment at 300℃ for 1 hour, and the surface of film was composed of "taper humps". When the film was heated, phase of Co2P deposited from the solid solution and allotropic transformation took place from hexagonal close-packed system to face-centred cubic lattice. Amorphous Co-Ni-P thin film had a lower coercive force and higher squareness ratio. The values of its coercive force and squareness ratio increased when the film was crystallized. Coercive force and squareness ratio of the film which was made up of α-Co and phase of Co2P reached their peak values under the influence of much phosphorous segregating at crystal boundary when heated to 500℃ 1 hour. As temperature was increased successively, the coercive force and squareness ratio of the film decreased because of grain growth and second phase coarsening. Electroless Co-Ni-P thin film possessed perpendicular recording properties with fine high density.