研究者詳細

顔写真

リー　アヤン
Lee Ayoung
Lee Ayoung
所属
高等研究機構先端スピントロニクス研究開発センター　スピントロニクス材料研究グループ
職名
助教
学位

  • Ｐｈ．Ｄ．（Hanyang University）

  • Ｍ．Ｓ．（Incheon National University）

e-Rad 研究者番号
01015983

経歴 4

  • 2024年12月 ～ 継続中
    東北大学　先端スピントロニクス研究開発センター

  • 2023年11月 ～ 2024年10月
    Leibniz Institute for Solid State and Materials Research Dresden　Institute for Complex Materials

  • 2021年4月 ～ 2023年9月
    Korea Institute of Materials Science　Functional Ceramics Department Ceramic Materials Division

  • 2015年9月 ～ 2021年2月
    Korea Institute of Industrial Technology　Advanced Materials and Process R&D Department

学歴 3

  • Hanyang University　Department of Materials Science and Engineering

    2015年9月 ～ 2021年2月

  • Incheon National University　Advanced Materials science and Engineering

    2013年3月 ～ 2015年2月

  • Incheon National University　Advanced Materials science and Engineering

    2009年3月 ～ 2013年2月

研究キーワード 2

  • Surface plasmon/Spin caloritronics project

  • Magnetocaloric materials/Magnetocrystalline anisotropy/Alloy design

研究分野 2

  • ナノテク・材料 / ナノマイクロシステム /

  • ナノテク・材料 / 構造材料、機能材料 /

論文 10

  1. Evolution of magnetocaloric anisotropy in gadolinium wires induced by cold drawing

    Woo Seok Yang, Jeong Hun Kim, Min Jik Kim, Seon Yeong Yang, A.-Young Lee, Hadiseh Esmaeilpoor, Jeoung Han Kim, Kwang Seok Lee, Da Seul Shin

    Journal of Alloys and Compounds　1014　178657-178657　2025年2月

    出版者・発行元： Elsevier BV

    DOI： 10.1016/j.jallcom.2025.178657 　

    ISSN：0925-8388

  2. Effect of aluminum incorporations on the magnetocaloric properties in La1.2(Fe,Co,Si)13 alloys

    A-Young Lee, Ki Hoon Kang, Kook-Chae Chung, Jong-Woo Kim

    Intermetallics　173　108408-108408　2024年10月

    出版者・発行元： Elsevier BV

    DOI： 10.1016/j.intermet.2024.108408 　

    ISSN：0966-9795

  3. Effect of Cr substitution on the magnetocaloric properties and corrosion resistance of (Mn,Fe)2(P,Si) alloys

    A-Young Lee, Ki Hoon Kang, Sung Cheol Park, Jong-Woo Kim

    APL Materials　11　(9)　2023年9月1日

    出版者・発行元： AIP Publishing

    DOI： 10.1063/5.0153375 　

    eISSN：2166-532X

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    This study investigated the effects on the magnetocaloric properties and corrosion resistance of Cr substitution for Fe in (Mn,Fe)2(P,Si) alloys. The characteristics of the first-order phase transition and the crystal structure were maintained, even after Cr substitution. In particular, a discontinuous change in the lattice parameters was exhibited during the transition from the ferromagnetic to paramagnetic phase at the Curie temperature. Increasing the Cr content reduced the Curie temperature and isothermal entropy change. The thermal hysteresis gradually increased by increasing the Cr content. Meanwhile, the small Cr content maintained the adiabatic temperature change and improved the corrosion resistance. Therefore, the tuning of the Cr content in (Mn,Fe)2(P,Si) alloys can provide possible applications due to their notable magnetocaloric properties and improved corrosion resistance.

  4. Magnetocaloric properties of a wire composite of La (Fe,Mn,Si)13-H alloy powders in a Gd cylindrical tube

    K.C. Chung, K.P. Shinde, K.H. Kang, A.Y. Lee, J.S. Park, J.-W. Kim

    Journal of Alloys and Compounds　947　169551-169551　2023年6月

    出版者・発行元： Elsevier BV

    DOI： 10.1016/j.jallcom.2023.169551 　

    ISSN：0925-8388

  5. Magnetoelastic coupling induced magnetocaloric property variations in Ni-doped (Mn, Fe)2(P, Si) alloys

    Ki Hoon Kang, A-Young Lee, Hyun Ae Cha, Jongmoon Jang, Cheol-Woo Ahn, Jong-Jin Choi, Byung-Dong Hahn, Woon-Ha Yoon, Joon-Hwan Choi, Jong-Woo Kim

    Journal of Alloys and Compounds　927　167008-167008　2022年12月

    出版者・発行元： Elsevier BV

    DOI： 10.1016/j.jallcom.2022.167008 　

    ISSN：0925-8388

  6. Effect of Secondary Phases on Multi-Step Phase Transitions and Magnetocaloric Properties in MnFe-Based Alloys

    A-Young Lee, Min-Ha Lee, Song-Yi Kim, JunHee Han, Ki-Hoon Kang, Jong-Woo Kim

    Metals　12　(11)　1967-1967　2022年11月17日

    出版者・発行元： MDPI AG

    DOI： 10.3390/met12111967 　

    eISSN：2075-4701

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    This study investigated the effect of the secondary phases on multi-step phase transitions and the magnetocaloric properties depending on the Ge content in the MnFeCoPSiGe alloys. Two-step phase transitions were observed by the variations of the Fe2P-type hexagonal structure (first-order) and secondary phases (second-order). The Curie temperature alters with non-linear behavior consistent with change of the lattice parameters. In addition, the magnetic entropy change decreased with the increase of the Ge content and, subsequently, fractions of the secondary phases. However, the morphological variation of microstructure, distributed as a circular-type shape of the Fe2P-type hexagonal structure in the Ge-rich matrix, increased the magnetic entropy change. Therefore, the addition of Ge enables the control of the Curie temperature to be applicable for high temperature operating devices. The control of the secondary phases and morphology of the microstructure are crucial to improve the phase transition and magnetic entropy change.

  7. Enhancement of magnetocaloric properties by control of magnetocrystalline anisotropy in Ge doped MnFeHfPSi alloy

    A-Young Lee, Ki Hoon Kang, Hyungju Ahn, Jun Hee Han, Min-Ha Lee, Jong-Woo Kim

    AIP Advances　12　(9)　2022年9月1日

    出版者・発行元： AIP Publishing

    DOI： 10.1063/5.0102522 　

    eISSN：2158-3226

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    This study investigated the improvement in magnetocaloric properties with magnetocrystalline anisotropy by Ge doping in MnFeHfPSi alloys. The maximum magnetic entropy change gets larger in alloys with higher magnetocrystalline anisotropy. This result is induced by the fractions of easy and hard magnetization planes. In addition, the magnetocaloric properties indicate large differences based on the direction between the easy magnetization plane and the applied magnetic field. Especially, the difference in magnetic entropy change under a low magnetic field is higher than that under a strong magnetic field. Besides, when magnetic transition occurs from a ferromagnetic to a paramagnetic state, the fraction of the easy magnetization plane decreases. Therefore, orientations with an easy magnetization plane play an important role in the enhancement of magnetocaloric properties.

  8. Strain perceptibility of elements on the diffusion in Zr-based amorphous alloys

    A. Y. Lee, S. Y. Kim, H. Jang, Y. D. Kim, F. Spieckermann, G. Wilde, J. Eckert, M. H. Lee

    Scientific Reports　10　(1)　2020年3月12日

    出版者・発行元： Springer Science and Business Media LLC

    DOI： 10.1038/s41598-020-61023-0 　

    eISSN：2045-2322

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    Abstract With the discovery of bulk metallic glasses (BMGs), there has been considerable interest in understanding their mechanical behavior. In spite of these previous observations on the relation between plastic deformation of metallic glasses and their diffusion behavior, a detailed understanding on the diffusion of BMGs is still unexplored. We evaluated the contribution of deformation-induced structural transformations (elastic, anelastic, viscoplastic or viscoelastic responsive and plastic strain) on the diffusion of Zr-based bulk metallic glasses in as-cast, elastostatically stressed and plastically deformed states. Experimental investigations of the diffusion process and the elemental distributions in the glassy alloy were performed following plastic deformation by multiple cold rolling and elastostatic cyclic compression, respectively. We compared the vacancy model and the transition state model to verify the diffusion mechanism in the deformed bulk metallic glass. The diffusion of tracer atoms, i.e., Fe, in the bulk metallic glass is affected by viscoelastic responsive strain governing the transition-state model. In contrast, the diffusion of constituent atoms, i.e., Ti, Zr, in the bulk metallic glass is dominantly affected by plastic strain governing the vacancy model. The results reveal that the diffusion behavior of bulk glassy alloys can be changed by variation of the constituent elements and applying different strain modes upon deformation.

  9. The effect of refractory (Zr, Hf) elements on the magnetocaloric property of Mn-based alloys

    A.Y. Lee, S.Y. Kim, Y.D. Kim, M.H. Lee

    Applied Surface Science　478　1004-1008　2019年6月

    出版者・発行元： Elsevier BV

    DOI： 10.1016/j.apsusc.2019.01.271 　

    ISSN：0169-4332

  10. Effect of synthesis methods on magnetocaloric properties of Co-based Heusler-type alloys

    A.Y. Lee, S.Y. Kim, H.R. Oh, H.A. Kim, Y.D. Kim, M.H. Lee

    Materials Science and Engineering: B　231　98-104　2018年5月

    出版者・発行元： Elsevier BV

    DOI： 10.1016/j.mseb.2018.10.005 　

    ISSN：0921-5107

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