Colossal tunability in high frequency magnetoelectric voltage tunable inductors

Area of Science:

• Materials Science
• Electrical Engineering
• Condensed Matter Physics

Background:

• The magnetoelectric effect enables electrical control of magnetic properties, crucial for next-generation tunable electronic components.
• Magnetoelectric voltage tunable inductors (VTIs) aim to maximize electric field control over magnetic permeability for power electronics.
• High-frequency VTIs with substantial tunability and minimal loss are essential for modern power electronic systems.

Purpose of the Study:

• To demonstrate magnetoelectric VTIs with significantly enhanced inductance tunability at high frequencies.
• To explore the concept of magnetocrystalline anisotropy (MCA) cancellation for improved VTI performance.
• To investigate the underlying mechanisms of strain-mediated coupling between magnetization and polarization in these materials.

Main Methods:

• First-principles calculations to predict MCA cancellation in nickel ferrite and cobalt ferrite solid solutions.
• Phase field model simulations to visualize domain-level interactions and coupling mechanisms.
• Fabrication and characterization of magnetoelectric VTIs operating up to 10 MHz.

Main Results:

• Demonstrated VTIs with over 750% inductance tunability up to 10 MHz, covering the operational range of state-of-the-art power electronics.
• Confirmed MCA cancellation as a key factor enabling large permeability sensitivity and inductance tunability.
• Phase field simulations revealed how reduced MCA facilitates magnetic domain rotation, enhancing device performance.

Conclusions:

• The developed magnetoelectric VTIs offer unprecedented tunability for high-frequency power electronics.
• MCA cancellation is a viable strategy for designing high-performance magnetoelectric devices.
• This work paves the way for advanced tunable electrical components with significant improvements in performance and efficiency.