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Related Experiment Video

Updated: Jun 11, 2026

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7&#8722;&#948;/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Published on: April 12, 2019

Robust Ferromagnetically Insulating States in LaCoO3 Films through Hydrogen-Driven Multistate Topotactic Phase

Xuanchi Zhou1,2, Xiaomei Qiao1, Jiahui Ji1

  • 1Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education & School of Materials Science and Engineering, Shanxi Normal University, Taiyuan 030031, China.

ACS Applied Materials & Interfaces
|June 10, 2026
PubMed
Summary

Hydrogenation creates room-temperature ferromagnetic insulators in LaCoO3, enabling pure spin currents for low-power spintronics. This reversible state overcomes previous material limitations.

Keywords:
double exchange interactionferromagnetic insulatorhydrogenationlow-power spintronicsspin-state transition

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
09:41

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Low-power spintronic devices require room-temperature ferromagnetic insulators to generate pure spin currents without Joule heating.
  • Oxide materials face a trade-off between ferromagnetism and itinerant electrons, limiting robust ferromagnetic-insulating states.
  • Hydrogenation offers a method to tune ion-electron-lattice interactions for novel magnetoelectric properties.

Purpose of the Study:

  • To stabilize emergent room-temperature ferromagnetic insulators in the LaCoO3 system using hydrogenation.
  • To investigate the role of hydrogen incorporation in driving phase transformations and magnetic ordering.
  • To explore the potential of hydrogen-induced magnetoelectric states for low-power spintronic applications.

Main Methods:

  • Topotactic phase transformations induced by hydrogen incorporation in LaCoO3.
  • Oxygen vacancy ordering driven by hydrogenation.
  • Analysis of spin-state crossover and double exchange interactions.

Main Results:

  • Hydrogenation led to sequential phase transformations (LaCoO3-HLaCoO2.67-HLaCoO2.5) via oxygen vacancy ordering.
  • Enhanced electron localization and ferromagnetic ordering were observed.
  • A reversible, robust ferromagnetic-insulating state was achieved in LaCoO3 above room temperature.

Conclusions:

  • Hydrogenation is a versatile approach to engineer magnetoelectric states in oxides.
  • The developed LaCoO3 system exhibits potential for low-power spintronic devices due to its room-temperature ferromagnetic-insulating properties.
  • This work demonstrates hydrogen-driven multistate magnetoelectric evolutions by tuning ion-electron-lattice interplay.