Giant magnetic anisotropy in Mn3O4 investigated by 55Mn2+ and 55Mn3+ NMR

Changsoo Kim, Euna Jo, Byeongki Kang, Sangil Kwon, Soonchil Lee, Jeong Hyun Shim, Takehiko Suzuki, Takuro Katsufuji

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    In Mn3O4, the magnetization along the c axis is different from that along the ab plane even in the strong field of 30 T. To investigate the origin of the huge magnetic anisotropy, Mn2+ and Mn3+ nuclear magnetic resonance spectra were measured in the 7-T magnetic field. The canting angle of the magnetic moments was estimated for various directions of field by rotating a single-crystalline Mn 3O4 sample. One of the main results is that Mn3 + moments lie nearly in the ab plane in the external field perpendicular to the plane, meaning that the macroscopic magnetic anisotropy of Mn3O4 originates from the magnetic anisotropy of Mn3 + in the ab plane. The anisotropy field is estimated to be about 65 T. It is obvious that the Yafet-Kittel structure made of Mn2+ and Mn3+ spins lies in the ab plane due to this huge magnetic anisotropy, contrary to the previous reports. By the least-squares fit of the canting angle data for various field directions to a simple model, we obtained that J BB=1.88JAB-0.09 meV and KA=-14.7J AB+2.0 meV, where JAB, JBB, and KA are the exchange interaction constants between Mn2+ moments, Mn2 + and Mn3+ moments, and an anisotropy constant of Mn2 +, respectively.

    Original languageEnglish
    Article number224420
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume86
    Issue number22
    DOIs
    Publication statusPublished - 2012 Dec 26

    Fingerprint

    Magnetic anisotropy
    Nuclear magnetic resonance
    nuclear magnetic resonance
    anisotropy
    Anisotropy
    moments
    Exchange interactions
    Magnetic moments
    Magnetization
    Magnetic fields
    Crystalline materials
    manganese oxide
    magnetic moments
    magnetization
    magnetic fields
    Direction compound
    interactions

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Giant magnetic anisotropy in Mn3O4 investigated by 55Mn2+ and 55Mn3+ NMR. / Kim, Changsoo; Jo, Euna; Kang, Byeongki; Kwon, Sangil; Lee, Soonchil; Shim, Jeong Hyun; Suzuki, Takehiko; Katsufuji, Takuro.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 22, 224420, 26.12.2012.

    Research output: Contribution to journalArticle

    Kim, Changsoo ; Jo, Euna ; Kang, Byeongki ; Kwon, Sangil ; Lee, Soonchil ; Shim, Jeong Hyun ; Suzuki, Takehiko ; Katsufuji, Takuro. / Giant magnetic anisotropy in Mn3O4 investigated by 55Mn2+ and 55Mn3+ NMR. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 86, No. 22.
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    abstract = "In Mn3O4, the magnetization along the c axis is different from that along the ab plane even in the strong field of 30 T. To investigate the origin of the huge magnetic anisotropy, Mn2+ and Mn3+ nuclear magnetic resonance spectra were measured in the 7-T magnetic field. The canting angle of the magnetic moments was estimated for various directions of field by rotating a single-crystalline Mn 3O4 sample. One of the main results is that Mn3 + moments lie nearly in the ab plane in the external field perpendicular to the plane, meaning that the macroscopic magnetic anisotropy of Mn3O4 originates from the magnetic anisotropy of Mn3 + in the ab plane. The anisotropy field is estimated to be about 65 T. It is obvious that the Yafet-Kittel structure made of Mn2+ and Mn3+ spins lies in the ab plane due to this huge magnetic anisotropy, contrary to the previous reports. By the least-squares fit of the canting angle data for various field directions to a simple model, we obtained that J BB=1.88JAB-0.09 meV and KA=-14.7J AB+2.0 meV, where JAB, JBB, and KA are the exchange interaction constants between Mn2+ moments, Mn2 + and Mn3+ moments, and an anisotropy constant of Mn2 +, respectively.",
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    AU - Lee, Soonchil

    AU - Shim, Jeong Hyun

    AU - Suzuki, Takehiko

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