期刊
ACS APPLIED NANO MATERIALS
卷 2, 期 2, 页码 975-982出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.8b02281
关键词
magnetic memory; CoPt; template synthesis; nonoparticle array; out-of-plane polarization
资金
- Basic Science Research Program through the National Research Foundation of Korea [NRF-20090081018, NRF-2016R1A6A3A1193310, NRF-2018R1A5A6075959]
- Institute for Basic Science (IBS) in Korea [IBS-R009-G1]
The bit-patterned media (BPM) technology is a promising approach for developing high-density memory devices. Porous templates such as anodized aluminum oxide and self-assembled block copolymer films have been explored for use in BPM. In this work, in order to further increase the pore density, we used a mesoporous silica thin film (MSTF) with 8 nm sized regularly ordered pores and 4 nm thick walls as a template to grow CoPt3 nanoparticles (NPs) into two-dimensional hexagonal arrays. The use of a Au(111)/SiO2 substrate induced epitaxial growth of single-crystalline CoPt3 NPs in the face-centered cubic structure, as evidenced by high-resolution transmission electron microscopy and grazing-incidence X-ray scattering data. Direction-dependent magnetic measurements showed that the CoPt3 NPs had out-of-plane magnetic polarization. Magnetic force microscopy (MFM) data indicated that individual CoPt3 NPs could be addressed independently. First-principles electronic structure calculations indicated that the observed out-of-plane magnetic polarization of CoPt3 NPs originated from the tensile stress induced by the lattice mismatch between CoPt3 NPs and Au(111). The array of CoPt3 NPs had a remarkably high density of 5 X 10(12) NPs/in(2).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据