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Transparent EuTiO3 films: a possible two-dimensional magneto-optical device.

Annette Bussmann-Holder1, Krystian Roleder2, Benjamin Stuhlhofer1

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Summary
This summary is machine-generated.

High-quality Europium Titanate (EuTiO3) thin films on Strontium Titanate (STO) substrates exhibit tunable magneto-optical properties near room temperature. These materials offer versatile light modulation capabilities using small magnetic fields and sample rotation.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Transparent conducting oxides and thin films are crucial for optoelectronic devices.
  • Magneto-optical effects enable non-contact control of light polarization and intensity.
  • Europium Titanate (EuTiO3) and Strontium Titanate (STO) are insulating perovskite oxides with potential for novel functionalities.

Purpose of the Study:

  • To investigate the magneto-optical activity of EuTiO3 thin films on STO substrates.
  • To demonstrate the potential of these materials for light modulation applications.
  • To explore the tunability of birefringence (Δn) using external magnetic fields and temperature.

Main Methods:

  • Deposition of high-quality, transparent, insulating EuTiO3 thin films on STO substrates.
  • Characterization of magneto-optical properties, including birefringence.
  • Application of small magnetic fields and sample rotation to modulate optical properties.
  • Temperature-dependent measurements to assess operating range.

Main Results:

  • EuTiO3/STO thin films exhibit significant magneto-optical activity.
  • Birefringence can be switched on/off using small magnetic fields.
  • Sample rotation in a magnetic field allows for modification of birefringence.
  • A fourfold increase in Δn is achievable with modest fields, extending the operating temperature by ~100 K.

Conclusions:

  • EuTiO3 thin films on STO substrates are versatile materials for light modulation.
  • The observed magneto-optical effects are tunable near room temperature, enabling device engineering.
  • These findings pave the way for novel magneto-optical devices operating under accessible conditions.