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Unique Ferromagnetic Properties Observed in All-Organic Radical Liquid Crystals

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Engineering Crystallography: From Molecule to Crystal to Functional Form

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Abstract

We discovered that all-organic rod-like liquid crystalline (LC) compounds (1) with a stable nitroxide radical unit in the central core position exhibit unique intermolecular ferromagnetic interactions, which was referred to as ‘magneto-LC effects’, induced by low magnetic fields in the various LC phases. The origin of magneto-LC effects was interpreted in terms of the generation of a sort of spin glass-like inhomogeneous ferromagnetic interactions (the average spin-spin exchange interaction constant \( \overline{J} \) > 0). By measuring the electric field dependence of EPR spectra of the ferroelectric LC phase which can simultaneously show ‘positive magneto-LC effect’, two magnetic bistable states, anisotropy in spin-spin dipole interactions, and ‘magneto-electric effect’ were observed for the first time in a surface-stabilized liquid crystal cell.

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Authors and Affiliations

  1. Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan

    Rui Tamura

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  1. Rui Tamura
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Correspondence to Rui Tamura .

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Editors and Affiliations

  1. School of Chemical & Process Engineering, University of Leeds, Leeds, United Kingdom

    Kevin J. Roberts

  2. Pfizer Global R&D, Pharmaceutical Sciences, Pfizer Global R&D, Sandwich, Kent, United Kingdom

    Robert Docherty

  3. Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto, Japan

    Rui Tamura

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Tamura, R. (2017). Unique Ferromagnetic Properties Observed in All-Organic Radical Liquid Crystals. In: Roberts, K., Docherty, R., Tamura, R. (eds) Engineering Crystallography: From Molecule to Crystal to Functional Form. NATO Science for Peace and Security Series A: Chemistry and Biology. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-1117-1_25

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