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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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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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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Tunneling electroresistance in multiferroic heterostructures.

D Barrionuevo1, Le Zhang, N Ortega

  • 1Department of Physics and Institute of Functional Nanomaterials, University of Puerto Rico, San Juan, Puerto Rico 00931-3343, USA.

Nanotechnology
|November 22, 2014
PubMed
Summary

Room temperature ferroelectric switching and tunneling were observed in ultra-thin lead zirconate titanate (PZT) films. Magnetic fields enhance tunnel current switching in these novel heterostructures, paving the way for advanced electronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ferroelectric materials exhibit spontaneous electric polarization.
  • Tunneling transport is crucial for nanoscale electronic devices.
  • Multiferroic heterostructures offer potential for novel functionalities.

Purpose of the Study:

  • To investigate room temperature ferroelectric switching in ultra-thin lead zirconate titanate (PZT) films.
  • To explore the magnetic field dependence of tunneling current in Pt/PZT/La0.67Sr0.33MnO3 (LSMO) heterostructures.
  • To understand the interplay between ferroelectricity and magnetism in these advanced materials.

Main Methods:

  • Fabrication of epitaxial Pt/PZT/LSMO heterostructures with PZT film thickness of 3-7 nm.
  • Characterization using X-ray diffraction (XRD), atomic force microscopy (AFM), and piezo force microscopy (PFM).
  • Electrical transport measurements including capacitance-voltage (C-V) and current density-voltage (J-V) characteristics.

Main Results:

  • Demonstrated room temperature ferroelectric polar switching in PZT ultra-thin films.
  • Observed significant variation in high-resistance/low-resistance (HRS/LRS) ratios (2:1 to 100:1) due to ferroelectric switching.
  • Showcased magnetic field dependent tunnel current switching, with effects amplified by in-plane external magnetic fields.
  • Confirmed electron tunneling as the dominant transport mechanism via conductance fitting to Brinkman's model.

Conclusions:

  • Ultra-thin PZT films exhibit robust ferroelectric switching at room temperature.
  • The Pt/PZT/LSMO heterostructures display tunable tunneling magnetoresistance.
  • These findings highlight the potential for developing novel spintronic and memory devices based on ferroelectric tunneling junctions.