• Title, Summary, Keyword: Self-organized nano structure

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Self-Organized Nano Structure in Co-22% Cr Alloy Thin Films with Substrate Temperatures (기판온도에 따른 Co-22%Cr 합금박막의자가정렬형 나노구조)

  • 송오성;이영민
    • Journal of the Korean institute of surface engineering
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    • v.34 no.6
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    • pp.531-536
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    • 2001
  • Co-22 %Cr alloy films are promising for high-density perpendicular magnetic recording media with their perpendicular anisotropy and large coercivity of 3000 Oe. We observed that a self organized nano structure (SONS) of fine ferromagnetic Co-enriched phase and paramagnetic Cr-enriched phase appears inside the grain of Co-Cr magnetic alloy thin films at the elevated substrate temperature after do-sputtering. The periodic fine Co-enriched phase and Cr-enriched phase is the plate shape of 80 (equation omitted)-wide and 1000 (equation omitted)-long. Cr-enriched phases are located at the center of grains. We prepared 5000 (equation omitted) -thick Co-22 %Cr films on polyimide substrate with varying substrate temperature of $ 30^{\circ}C$, $ 150^{\circ}C$ ,200 $^{\circ}C$, $300^{\circ}C$, and $400^{\circ}C$, respectively. A transmission electron microscope equipped with energy dispersive X-ray analyzer is employed to observe the microstructure of each samples after Co-enri-ched phase are etched selectively. The self organized nano structure of Co-enriched and Cr-enriched lamellar is observed above the substrate temperture of $150^{\circ}C$. No compositional change is observed with substrate temperature. The compositional phase separation in self organized structure becomes clear as the substrate temperature increases. Our results implies that the self organized nano structure in Co-22 %Cr film is ideal for ultra high density recording media by recording selectively on Co-enri-ohed phase.

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Magnetic Property Evolution of Co-22%Cr Alloy Thin Films with Self-Organized Nano Structure Formation (Co-22%Cr 합금박막의 자가정렬형 나노구조에 의한 자기적 물성)

  • Song, O-Seong;Lee, Yeong-Min
    • Korean Journal of Materials Research
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    • v.11 no.12
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    • pp.1042-1046
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    • 2001
  • Co-22%Cr alloy films are promising for high-density perpendicular magnetic recording media with their perpendicular anisotropy and large coercivity of 3000 Oe. We observed that a self organized nano structure(SONS) of fine ferromagnetic Co-enriched phase and paramagnetic Cr-enriched phase appears inside the grain of Co-Cr magnetic alloy thin films at the elevated substrate temperature after do-sputtering. We prepared 1000 $\AA$-thick Co-22%Cr films on 2000 $\AA$- SiO$_2$/Si(100) substrates at the deposition rate of 100 $\AA$/min with substrate temperatures of 3$0^{\circ}C$, 10$0^{\circ}C$, 15$0^{\circ}C$, 20$0^{\circ}C$, 30$0^{\circ}C$, and 40$0^{\circ}C$, respectively. We employed a vibrating sample magnetometer(VSM) to measure the B-H loops showing the saturation magnetifation, coercivity, remanence in in- plane and out- of- plane modes. In- plane coercivity, perpendicular coercivity, and perpendicular remanence increased as substrate temperature increased, how-ever they decreased after 30$0^{\circ}C$ slowly. Transmission electron microscope (TEM) characterization revealed that the self organized nano structure (SONS) appears at the elevated substrate temperature, which forms fine Co-enriched phases inside a grain, then it eventually affect the perpendicular magnetic property. Our results imply that we may tune the perpendicular magnetic properties with SONS obtained at appropriate substrate temperature.

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Influence of Pd Contents and Substrate Temperature on the Magnetic Property in Co1-xPdx Films (Co1-xPdx 합금의 Pd함량과 스퍼터 기판온도에 따른 자기적 특성 변화)

  • 이기영;송오성
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.8
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    • pp.744-751
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    • 2003
  • Co-Pd alloy thin films prepared by a DC-sputter that have self-organized nano structure(SONS), are promising for high-density information storage media in information era. We prepared the samples by varying Pd contents of 0~8.1 wt% at the substrate temperatures of room temperature (RT) and 200 $^{\circ}C$, respectively Microstructure and Pd contents of the Co$_{1-x}$ Pd$_{x}$ films are probed by a scanning electron microscope (SEM), a transmission electron microscope (TEM) and an energy dispersive spectrometer (EDS). We also investigated the saturation magnetization (Ms), remanence and coercivity of the Co$_{1-x}$ Pd$_{x}$ films. Surface roughness are measured by an atomic force microscope (AFM). We revealed that self-organized nano size Co-enriched phase and Pd-enriched phase existed with Pd contents at the substrate temperatures of RT and 20$0^{\circ}C$ through microstructure characterization. SONS helped to keep the saturation magnetization and enhance the perpendicular anisotropy with Pd contents. Out result implies that we may tune the perpendicular magnetic properties with keeping the saturation magnetization by varying substrate temperatures and Pd contents for high density magnetic recording.rding.

Formation of One-dimensional Nb2O5 Nanostructures by Anodization

  • Lee, Kiyoung
    • Journal of the Korean institute of surface engineering
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    • v.49 no.6
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    • pp.486-489
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    • 2016
  • In the present work, we investigate the anodization of Nb in a $K_2HPO_4$ containing glycerol electrolyte at elevated temperatures ($180^{\circ}C$). Under optimized conditions, uniformly over the entire anodized surface, self-organized porous $Nb_2O_5$ structures can be formed. The growth rate of highly ordered $Nb_2O_5$ is $1.7{\mu}m/min$ at beginning stage of anodization and the overall current efficiency is 70 %.

Fabrication of nano-rod on AAO template (AAO에 의한 나노로드 제작)

  • Hamrokulov, B.;Park, B.H.;Kim, In-Soo
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.482-484
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    • 2008
  • Anodic aluminum oxide (AAO) which prepared with two-step anodizing method (with dissimilar solutions) was used as a template to fabricate highly ordered, free standing metal nano-rods. AAO nano-template technique can realize self-organized hexagonal pore structure with nanometer dimension size, it's easy to control pore diameter, length and density by varying anodizing conditions. Ni and Ni/Fe/Cu multi-metal layer nanorods were electrochemically deposited into AAO nano-template by AC voltage in simple sulfate solutions.. The properties of samples are tested by X-ray diffraction (XRD), field emission microscopy (FE-SEM).

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A Study for the fabrication of Au dot-arrays using porous alumina film (다공성 알루미나 박막을 이용한 Au dot-arrays의 제작에 관한 연구)

  • Jung, Kyung-Han;Park, Sang-Hyun;Shin, Hoon-Kyu;Kwon, Young-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.922-925
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    • 2003
  • The interest of self-organization materials that have uniform and regular structure in nano scale has been grown due to their utilization in various fields of nanotechnology. An attractive candidate among these materials is anodic aluminum oxide film, which are formed by anodization of aluminum in an appropriate acid solution. The anodic aluminum oxide film has a highly ordered porous structure with very uniform and nearly parallel pores that can be organized in an almost precise close-packed hexagonal structure. In this study, we attempt to make Au dot arrays, which were fabricated using anodic aluminum oxide film as an evaporation mask. The Au dot arrays have a uniform sized dots and spacing to its neighbors and the average diameter of Au dots is about 60 nm corresponding to them of the mask.

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Fabrication of Nano-mask Using Porous Alumina Membrane (다공성 알루미나 박막을 이용한 나노마스크 제작)

  • Jung, Kyung-Han;Ryu, Kil-Yong;Chang, Jeong-Soo;Kwon, Young-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.364-365
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    • 2006
  • One of the promising routes for producing highly ordered nanostructures is a template method using the porous alumina membrane (PAM). Because the PAM is mechanically, chemically, thermally stabile with highly ordered structure, many researchers have studied under various experimental conditions to fabricate nanostructures. We present the information on the fabrication of about 300 nm nano-mask which have important applications for various patterned nanostructures.

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Soft Mold Imprinting Fabrication of Anti-reflection Film using Self-Organized Nanostructure Polymer Surfaces Irradiated by Ion Beams (이온빔 처리된 폴리머 표면의 자가나노구조화를 이용한 반사방지 필름 제조용 소프트 몰드 임프린팅 연구)

  • Lee, Seunghun;Byeon, Eun-Yeon;Choi, Juyeon;Jung, Sunghoon;Yu, Byeong-Gil;Kim, Do-Geun
    • Journal of the Korean institute of surface engineering
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    • v.50 no.6
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    • pp.480-485
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    • 2017
  • Soft mold imprinting method that uses nanostructured polymer mold was investigated for anti-reflection film fabrication. The nanostructured soft mold was polyethylene terephthalate(PET) irradiated by oxygen ion beams. The collisional energy transfer between oxygen ion and the polymer surface induced cross-linking and scission reactions, resulting in self-organized nanostructures with regular patterns of the wavenumber of $5{\mu}m^{-1}$. Post processes including ultra-violet curable resin coating and delamination fabricated anti-reflection films. The imprinted resin surface also showed the consistent wavenumber, $5{\mu}m^{-1}$. Pristine PET, oxygen ion beam treated PET, and imprinted replica sample showed total transmittance of 91.04, 93.25, and 93.57-93.88%, respectively.

A Study of Nanoscale Structure of Anodic Porous Alumina film (다공성 알루미나 박막의 나노 스케일 구조에 관한 연구)

  • 정경한;신훈규;권영수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.9
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    • pp.801-806
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    • 2003
  • In recent years, there has been large interest in the fabrication of the self organized nanoscale structures since not only their potential utilization in electronic, optoelectronic, and magnetic devices but also their fundamental interest such as uniformity and regularization. An attractive candidate of these materials is anodic porous alumina film(Al$_2$O$_3$) which is formed by the anodization of aluminum in an appropriate acid solution. In this study to fabricate the porous alumina film with very uniform and nearly parallel pores the anodization was carried out under constant voltage mode in 0.3M oxalic acid as an electrolyte. The hexagonally ordered arrays with a few $\mu\textrm{m}$ in size two-dimensional polycrystalline structure were obtained of which pore densities were 1.1${\times}$10$\^$10//$\textrm{cm}^2$.