Magnetization reversal mechanism of Nd-Fe-B films with perpendicular magnetic anisotropy
Magnetization reversal mechanism of Nd-Fe-B films with perpendicular magnetic anisotropy
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DOI：
10.1063/1.3563059
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发表时间：
2011-04
影响因子：
3.2
通讯作者：
Xiaoxi Liu;G. Ishida;A. Morisako
中科院分区：
文献类型：
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作者：
Xiaoxi Liu;G. Ishida;A. Morisako
研究了厚度为100 nm~3 nm的Nd-Fe-B薄膜的微观结构和磁性能。所有薄膜均表现出优异的垂直磁各向异性，垂直方向的矩形比为1，面内方向的矫顽力几乎为零。特别令人感兴趣的是，初始磁化曲线敏感地取决于薄膜厚度。厚度超过 15 nm 的薄膜表现出陡峭的初始磁化曲线。尽管薄膜的矫顽力大于21 kOe，但薄膜可以在小至5 kOe的磁场下从热退磁状态完全磁化。随着膜厚减小到5 nm，初始磁化曲线变得平坦。初始磁化曲线随薄膜厚度的演变可以通过薄膜的微观结构来理解。厚度为 15 nm 的薄膜显示出紧密堆积的晶粒，没有任何晶间相。这种微观结构导致陡峭的初始磁化曲线。另一方面，当...
The microstructure and magnetic properties of Nd-Fe-B films with thicknesses from 100 nm to 3 nm have been investigated. All the films show excellent perpendicular magnetic anisotropy with a squareness ratio of 1 in the perpendicular direction and almost zero coercivity in the in-plane direction. Of particular interest is that the initial magnetization curves sensitively depended on the film thickness. Films thicker than 15 nm show steep initial magnetization curve. Although the films have coercivities larger than 21 kOe, the films can be fully magnetized from the thermally demagnetized state with a field as small as 5 kOe. With the decrease of film thickness to 5 nm, the initial magnetization curve becomes flat. The evolution of initial magnetization curves with film thickness can be understood by the microstructure of the films. Films with thickness of 15 nm show close-packed grains without any intergranular phases. Such microstructures lead to steep initial magnetization curves. On the other hand, when...