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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
Pressure effects on Emim[FeCl4], a magnetic ionic liquid with three-dimensional magnetic ordering
Abel García-Saiz1, Imanol de Pedro, Jesús A Blanco
1CITIMAC & MAGMA, Unidad Asociada-CSIC, Facultad de Ciencias, Universidad de Cantabria, 39005 Santander, Spain.
The Journal of Physical Chemistry. B
|February 23, 2013
Summary
We found that applying slight pressure to the magnetic ionic liquid 1-ethyl-3-methylimidazolium tetrachloroferrate (Emim[FeCl4]) changes its magnetic ordering from antiferromagnetic to ferrimagnetic. This transition is reversible and occurs near room temperature.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Magnetic ionic liquids are novel materials with tunable magnetic properties.
- Understanding the influence of external stimuli like pressure on magnetic ordering is crucial for their application.
Purpose of the Study:
- To investigate the effects of hydrostatic pressure on the magnetic ordering of 1-ethyl-3-methylimidazolium tetrachloroferrate (Emim[FeCl4]).
- To explore the relationship between structural properties and magnetic behavior under pressure.
Main Methods:
- Combined magnetization and Raman spectroscopy measurements.
- Utilized a miniature piston-cylinder CuBe pressure cell to apply hydrostatic pressure.
Main Results:
- Observed long-range antiferromagnetic ordering below the Néel temperature (T(N) ≈ 3.8 K).
- Low applied pressure induced a transition from antiferromagnetic to ferrimagnetic ordering.
- Raman spectroscopy confirmed isolated [FeCl4](-) anions and suggested Fe-Cl-Cl-Fe superexchange pathways.
- Magnetic hysteresis was observed near room temperature during the liquid-solid phase transition, tunable by pressure.
Conclusions:
- Hydrostatic pressure significantly influences the magnetic interactions in Emim[FeCl4].
- The material exhibits a pressure-induced transition from antiferromagnetic to ferrimagnetic ordering.
- The observed magnetic properties are linked to the anion structure and superexchange pathways.
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