Composite nanogranular films of FePt-MgO with (001) orientation onto glass substrates
Composite nanogranular films of FePt-MgO with (001) orientation onto glass substrates
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DOI：
10.1063/1.1641168
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发表时间：
2004-01
影响因子：
4
通讯作者：
K. Kang;Z. Zhang;C. Papusoi;Takao Suzuki
中科院分区：
文献类型：
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作者：
K. Kang;Z. Zhang;C. Papusoi;Takao Suzuki
对于垂直磁记录，介绍了使用MgO作为种子层和中间层的设计。通过将具有MgO/[FePt/MgO]3的堆叠结构的多层膜在600 °C下退火1分钟，在玻璃基板上获得具有高垂直磁各向异性的FePt纳米颗粒。这种高的磁各向异性是由于L10相的（001）织构沿薄膜法线沿着方向发展的结果。厚度在1.0至3.0 nm范围内的薄MgO层在发展L10 FePt的（001）织构和磁性解耦FePt颗粒方面起重要作用。改变FePt层的层厚度能够控制晶体结构和磁性能，导致具有小至几纳米的可控FePt晶粒尺寸、高剩磁矩形度和高矫顽力的膜。
For perpendicular magnetic recording, a design of using MgO as a seed layer and an intermediate layer is introduced. By annealing the multilayer film with a stack structure of MgO/[FePt/MgO]3 at 600 °C for 1 min, nanograins of FePt with a high perpendicular magnetic anisotropy are obtained on a glass substrate. This high magnetic anisotropy results from the (001) texture of L10 phase developed along the film normal. A thin MgO layer ranging 1.0 to 3.0 nm in thickness plays an important role in developing the (001) texture of L10 FePt and magnetically decoupling the FePt particles. Varying a layer thickness of the FePt layer enables to control the crystalline structure and the magnetic properties, resulting in the films with a controllable FePt grain size as small as several nanometers, a high remanence squareness, and a high coercivity.