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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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Biasing of Metal-Semiconductor Junctions01:27

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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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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KNN-based frequency-adjustable ferroelectric heterojunction and biomedical applications.

Tao Zhang1, Haoyuan Hu2,3, Hong Jiang4,5

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|August 2, 2025
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This study introduces a lead-free piezoelectric ceramic heterojunction for biomedical uses. The device enables precise, adjustable ultrasound for brain modulation and treats myocardial infarction in animal models.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Lead-free K$_{0.5}$Na$_{0.5}$NbO$_{3}$ piezoelectric ceramics offer an environmentally friendly alternative to lead-based materials.
  • Ferroelectric heterojunctions are crucial for advanced biomedical devices, particularly for neuromodulation.
  • Developing implantable, miniaturized devices with adjustable functionality is a key challenge.

Purpose of the Study:

  • To design and fabricate a frequency-adjustable ferroelectric heterojunction using lead-free K$_{0.5}$Na$_{0.5}$NbO$_{3}$ piezoelectric ceramics.
  • To evaluate the device's performance for transcranial neuromodulation and therapeutic applications.
  • To demonstrate the potential of lead-free heterojunctions in clinical treatments.

Main Methods:

  • Fabrication of a miniaturized, flexible ferroelectric heterojunction using K$_{0.5}$Na$_{0.5}$NbO$_{3}$ with a high piezoelectric coefficient (d$_{33}$ = 680 pC/N).
  • Testing ultrasound generation and focal characteristics after penetrating a rat skull (3 MHz frequency, 7.9 mm focal depth, 480 μm focal width).
  • Assessing long-term transcranial neuromodulation efficacy and therapeutic effects in a myocardial infarction animal model.

Main Results:

  • The heterojunction achieved miniaturization (φ = 13.3 mm, h = 2.28 mm) and was suitable for implantation.
  • Generated ultrasound with precise focal depth and width, enabling millimeter-scale focal tuning within a narrow frequency range (2.7-3.3 MHz).
  • Demonstrated successful long-term, high-precision transcranial neuromodulation and therapeutic effects in myocardial infarction models.

Conclusions:

  • Lead-free ferroelectric heterojunctions provide a viable and environmentally sound platform for advanced biomedical applications.
  • The developed device shows significant potential for brain modulation therapies and novel clinical treatments.
  • This research expands the application scope of lead-free piezoelectric materials in medicine.