Ferroelectronics Lab

Understanding and utilizing non-volatile properties of materials

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Steve defends his PhD dissertation! Congratulations Steve!

September 22, 2021 By Matt Webb

On September 13th, Steve gave a great defense of his PhD dissertation, titled “Composite Spin Hall
Conductivity from Non-collinear Antiferromagnetic Order
“. Congratulations Steve! The Ferroelectronics Lab wishes you the very best luck in your future work!

Filed Under: Graduate Student Progress

New Publication! “Switching with ions”

September 2, 2021 By Matt Webb

Abstract:

“Solid-state hydrogen gating of a ferrimagnetic metal enables independent reversal of Néel and magnetization vectors by an electric field.”

Full text available from: Nature Nanotechnology

Filed Under: Publications

New Publication! “Memristors Based on (Zr, Hf, Nb, Ta, Mo, W) High-Entropy Oxides”

September 2, 2021 By Matt Webb

Abstract:

“Memristors have emerged as transformative devices to enable neuromorphic and in-memory computing, where success requires the identification and development of materials that can overcome challenges in retention and device variability. Here, high-entropy oxide composed of Zr, Hf, Nb, Ta, Mo, and W oxides is first demonstrated as a switching material for valence change memory. This multielement oxide material provides uniform distribution and higher concentration of oxygen vacancies, limiting the stochastic behavior in resistive switching. (Zr, Hf, Nb, Ta, Mo, W) high-entropy-oxide-based memristors manifest the “cocktail effect,” exhibiting comparable retention with HfO2– or Ta2O5-based memristors while also demonstrating the gradual conductance modulation observed in WO3-based memristors. The electrical characterization of these high-entropy-oxide-based memristors demonstrates forming-free operation, low device and cycle variability, gradual conductance modulation, 6-bit operation, and long retention which are promising for neuromorphic applications.”

Full text available from: Advanced Electronic Materials

Filed Under: Publications

Nguyen defends her PhD dissertation! Congratulations Nguyen!

August 11, 2021 By Matt Webb

Today, Nguyen gave a great defense of her PhD dissertation, titled “Strain engineering of perpendicular magnetic insulators for magnetoelectronics“. Congratulations Nguyen! The Ferroelectronics Lab wishes you the very best luck in your future work!

Filed Under: Graduate Student Progress

New Publication! “Toward the predictive discovery of ambipolarly dopable ultra-wide-band-gap semiconductors: The case of rutile GeO2”

July 1, 2021 By Matt Webb

ABSTRACT

Ultrawide-band-gap (UWBG) semiconductors are promising for fast, compact, and energy-efficient power-electronics devices. Their wider band gaps result in higher breakdown electric fields that enable high-power switching with a lower energy loss. Yet, the leading UWBG semiconductors suffer from intrinsic materials’ limitations with regard to their doping asymmetry that impedes their adoption in CMOS technology. Improvements in the ambipolar doping of UWBG materials will enable a wider range of applications in power electronics as well as deep-UV optoelectronics. These advances can be accomplished through theoretical insights on the limitations of current UWBG materials coupled with the computational prediction and experimental demonstration of alternative UWBG semiconductor materials with improved doping and transport properties. As an example, we discuss the case of rutile GeO2 (r-GeO2), a water-insoluble GeO2 polytype, which is theoretically predicted to combine an ultra-wide gap with ambipolar dopability, high carrier mobilities, and a higher thermal conductivity than β-Ga2O3. The subsequent realization of single-crystalline r-GeO2 thin films by molecular beam epitaxy provides the opportunity to realize r-GeO2 for electronic applications. Future efforts toward the predictive discovery and design of new UWBG semiconductors include advances in first-principles theory and high-performance computing software, as well as the demonstration of controlled doping in high-quality thin films with lower dislocation densities and optimized film properties.

Full text available from Applied Physics Letters 

Filed Under: Publications

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News

  • New Publication! “Geometric defects induced by strain relaxation in thin film oxide superlattices.” November 10, 2022
  • New Publication! “Nanophotonic control of thermal emission under extreme temperatures in air” September 29, 2022
  • New Publication! “Germanium dioxide: A new rutile substrate for epitaxial film growth” September 1, 2022

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About

Our work is multidisciplinary. We employ concepts and tools from the fields of materials science, chemistry, physics and electrical engineering to develop new methods to investigate and engineer … Read More

News

New Publication! “Geometric defects induced by strain relaxation in thin film oxide superlattices.”

November 10, 2022 By Matt Webb

New Publication! “Nanophotonic control of thermal emission under extreme temperatures in air”

September 29, 2022 By Matt Webb

Contact

Ferroelectronics Lab
Address: 2030 H.H. Dow

T: (734) 763-6914
E: jtheron@umich.edu
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