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  1. Article ; Online: Capturing Coherent Magnons by Tip-Assisted Terahertz Spectroscopy.

    Park, Byung Cheol / Oh, Sang Hyup / Choi, Young Jai / Ha, Taewoo

    Nano letters

    2024  Volume 24, Issue 8, Page(s) 2529–2536

    Abstract: Our study highlights the versatility of tip-assisted terahertz spectroscopy in probing coherent magnons, the elementary quanta of spin waves in magnetic materials. We identify two distinct coherent magnon types in canted antiferromagnet ... ...

    Abstract Our study highlights the versatility of tip-assisted terahertz spectroscopy in probing coherent magnons, the elementary quanta of spin waves in magnetic materials. We identify two distinct coherent magnon types in canted antiferromagnet YFeO
    Language English
    Publishing date 2024-02-13
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.3c04485
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Re-order parameter of interacting thermodynamic magnets.

    Park, Byung Cheol / Lee, Howon / Oh, Sang Hyup / Shin, Hyun Jun / Choi, Young Jai / Ha, Taewoo

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 3294

    Abstract: Phase diagrams of materials are typically based on a static order parameter, but it faces challenges when distinguishing subtle phase changes, such as re-ordering. Here, we report a dynamic nonequilibrium order parameter termed re-order parameter to ... ...

    Abstract Phase diagrams of materials are typically based on a static order parameter, but it faces challenges when distinguishing subtle phase changes, such as re-ordering. Here, we report a dynamic nonequilibrium order parameter termed re-order parameter to determine subtle phases and their transitions in interacting magnets. The dynamical precession of magnetization, so-called magnon, premises as a reliable re-order parameter of strong spin-orbit coupled magnets. We employ orthoferrites YFeO
    Language English
    Publishing date 2024-04-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-024-47637-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: The effect of direct fluorination of polydimethylsiloxane films on their surface properties.

    Lee, Sangyun A / Oh, Sang Hyup / Lee, Woojin

    Journal of colloid and interface science

    2009  Volume 332, Issue 2, Page(s) 461–466

    Abstract: To investigate the effect of fluorination on the surface of polydimethylsiloxane (PDMS) film, direct fluorination was performed under a mild condition (approx. 2000 micromol/mol F(2) in nitrogen) for 120 min. No structural damage of PDMS films was ... ...

    Abstract To investigate the effect of fluorination on the surface of polydimethylsiloxane (PDMS) film, direct fluorination was performed under a mild condition (approx. 2000 micromol/mol F(2) in nitrogen) for 120 min. No structural damage of PDMS films was observed on the scanning electron microscopic images under the condition. Fourier-transform infrared/attenuated total reflectance (FTIR/ATR) and energy dispersive X-ray spectroscopy (EDS) results showed a successful fluorine introduction resulting in the structural change of PDMS. Surface property changes of PDMS films with respect to the extent of direct fluorination were also examined. Contact angles of water and alcohols on the PDMS surfaces decreased as fluorination time increased. Most alcohols showed greater decrease than water in the contact angle as a result of long-term fluorination, which sometimes results in zero contact angles of alcohols on the PDMS surfaces. Surface energy of PDMS films increased more than 200% after the direct fluorination for 120 min.
    Language English
    Publishing date 2009-04-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2008.12.062
    Database MEDical Literature Analysis and Retrieval System OnLINE

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