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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.8K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Fermi Level

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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Room-temperature ferroelectricity in strained SrTiO3.

J H Haeni1, P Irvin, W Chang

  • 1Department of Materials Science and Engineering, Penn State University, University Park, Pennsylvania 16802-5005, USA.

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|August 13, 2004
PubMed
Summary

Strain engineering enables room-temperature ferroelectricity in strontium titanate films. This method offers superior uniformity and enhanced dielectric properties for advanced microwave devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Ferroelectric materials with phase transitions near room temperature are crucial for electronic devices.
  • Chemical substitution in materials like Ba(x)Sr(1-x)TiO(3) is a common method to tune the ferroelectric transition temperature (T(c)) and dielectric constant (epsilon(r)).
  • However, chemical substitution often leads to heterogeneity, broadening the phase transition and negatively impacting device performance.

Purpose of the Study:

  • To investigate strain as an alternative method for tuning the ferroelectric transition temperature (T(c)) in ferroelectric films.
  • To achieve room-temperature ferroelectricity in strontium titanate (SrTiO3) by inducing epitaxial strain.
  • To evaluate the uniformity and dielectric properties of strain-engineered ferroelectric films for device applications.

Main Methods:

  • Utilizing a newly developed substrate to apply epitaxial strain to strontium titanate films.
  • Employing spatially resolved imaging techniques to analyze the local polarization state.
  • Measuring the dielectric constant (epsilon(r)) at GHz frequencies under varying electric fields.

Main Results:

  • Epitaxial strain significantly increased the ferroelectric transition temperature (T(c) by hundreds of degrees), inducing room-temperature ferroelectricity in normally non-ferroelectric strontium titanate.
  • The strain-induced enhancement in T(c) represents the largest reported to date.
  • Spatially resolved polarization imaging revealed exceptional uniformity in the strain-engineered films, surpassing those produced by chemical substitution.
  • High dielectric constant (epsilon(r) ~7,000 at 10 GHz) and sharp electric field dependence were observed at room temperature.

Conclusions:

  • Epitaxial strain is a powerful tool for engineering ferroelectric properties and achieving room-temperature ferroelectricity.
  • Strain engineering offers superior control over film uniformity compared to chemical substitution, leading to improved device characteristics.
  • The demonstrated high dielectric properties and tunability make these strain-engineered strontium titanate films highly promising for microwave device applications.