L10 FePt nanoparticles with distinct perpendicular magnetic anisotropy prepared on Au buffer layers by a micellar method
L10 FePt nanoparticles with distinct perpendicular magnetic anisotropy prepared on Au buffer layers by a micellar method
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胶束法在Au缓冲层上制备具有明显垂直磁各向异性的L10 FePt纳米粒子
DOI：
10.1063/1.3592972
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发表时间：
2011-06
影响因子：
3.2
通讯作者：
Z. G. Wang
中科院分区：
文献类型：
--
作者：
Y. Gao;X. W. Zhang;Z. G. Yin;F. T. Si;Y. M. Bai;X. L. Zhang;S. Qu;Z. G. Wang
采用胶束法在MgO（001）衬底上自组装FePt纳米粒子。我们引入了一个Au缓冲层来控制FePt纳米颗粒的晶格取向和磁性排列。在热退火处理过程中，实现了FePt纳米颗粒的明显的c轴择优取向。晶格重取向的驱动力被认为是由Au和FePt之间的晶格失配引起的应力的结果。随着Au层厚度的增加，c轴取向度显著提高，这是由于面内晶格的减少和Au层晶体质量的提高。在具有Au缓冲层的FePt样品中观察到了超导磁各向异性。面外矫顽力和剩磁比分别为3.1 kOe和0.8，远远超过面内值。
FePt nanoparticles were self-assembled on a MgO (001) substrate by a micellar method. We introduced an Au buffer layer to control the lattice orientation and the magnetic alignment of FePt nanoparticles. A distinct c-axis preferred orientation of the FePt nanoparticles was achieved during the thermal annealing treatment. The driving force of lattice reorientation is considered to be the result of the stress caused by the lattice misfit between Au and FePt. The degree of c-axis orientation is significantly enhanced with increasing Au thickness, which is attributed to the decrease of the in-plane lattice and the improved crystal quality of the Au layer. Perpendicular magnetic anisotropy was observed for the FePt samples with the Au buffer layer. The out-of-plane coercivity and remanence ratio are 3.1 kOe and 0.8, respectively, which far exceed the in-plane values.
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