Dielectric Measurements in Pulsed Fields

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

  • Compatible Magnets

  • Available Equipment

  • 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.

 

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 


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Last modified on 9 October 2014