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Park, Je Geun
강상관계 물질 연구단
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High-Density Ordered Arrays of CoPt3 Nanoparticles with Individually Addressable Out-of-Plane Magnetization

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Title
High-Density Ordered Arrays of CoPt3 Nanoparticles with Individually Addressable Out-of-Plane Magnetization
Author(s)
Kim, Yong-Tae; Jung, Hyunok; Lee, U-Hwang; Kim, Tae-Hoon; Jang, Jae Kyung; Park, Jong Bae; Rhee, Joo Yull; Yang, Cheol-Woong; Je-Geun Park; Kwon, Young-Uk
Publication Date
2019-02
Journal
ACS APPLIED NANO MATERIALS, v.2, no.2, pp.975 - 982
Publisher
AMER CHEMICAL SOC
Abstract
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).
URI
https://pr.ibs.re.kr/handle/8788114/11221
DOI
10.1021/acsanm.8b02281
ISSN
2574-0970
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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