The speed of the pulse actually increases signal to noise compared to measurements in superconducting magnets. Magnetic fields up 100 T are available. Samples are measured in a helium environment down to 0.5 K. Dielectric constant can also be measured in dc magnetic fields to 20 T and in pulsed fields up to 60 T in the mid or long-pulse magnets using a capacitance at frequencies up to 50 kHz.
Multiferroics combine electric and magnetic ordering in the same material. When these two properties are coupled, then a magnetic field can control the electric polarization, and an electric field can control the magnetization. This can lead to new applications such as ultra-sensitive solid state magnetic sensors, computer memory that combines the best properties of ferroelectric storage and magnetic read/write, solid-state microwave and high-power devices, energy harvesting, and other novel and smart circuit devices.
Instrumentation
- 14 Tesla PPMS, 20 Tesla Oxford system
- Current-to-voltage amplifiers
- Keithley Electrometers
- GC Capacitance bridge up to 50 kHz
- AH 2500 Capacitance bridge 1 Khz
- High-voltage power supplies
Images & Sample Data
Click on an image for larger view and details.
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Sample data showing pC/cm² resolution.
Sample data showing pC/cm² resolution.
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Multifunctional materials.
Multifunctional materials.
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Data from arXiv:1105.2058. on Lu₂MnCoO₆.
Data from arXiv:1105.2058. on Lu₂MnCoO₆.
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Rough schematic of electric polarization setup.
Rough schematic of electric polarization setup.
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High magnetic field transitions.
High magnetic field transitions.
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Custom electric polarization probe.
Custom electric polarization probe.
https://nationalmaglab.org/user-facilities/pulsed-field-facility/pff-measurement-techniques/dielectric-measurements-pff#sigProIde6b1343ed9
Related Publications
Jae Wook Kim, et al, Multiferroicity with coexisting isotropic and anisotropic spins in Ca3Co2-xMnxO6, Phys. Rev. B Rapid-Comm.89 (2014) Read online
E.D. Mun, et al, Magnetic field induced transition in vanadium spinels, Phys. Rev. Letters 112 (2014) Read online
V.S. Zapf, et al, Magnetically-induced electric polarization in an organo-metallic magnet, Phys. Rev. B 82 (2010) Read online