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Updated: Jun 23, 2026

Hyperpolarized Xenon for NMR and MRI Applications
Published on: September 6, 2012
Multi-state electromagnetic phase modulations in NiCo2O4 through cation disorder and hydrogenation
Xuanchi Zhou1,2, Xiaohui Yao1, Shuang Li1
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. xuanchizhou@sxnu.edu.cn.
Abstract:
One focal challenge in engineering low-power and scalable all-oxide spintronic devices lies in exploring ferromagnetic oxides with perpendicular magnetic anisotropy (PMA) and electronic conductivity while exhibiting tunable spin states. Targeting this need, spinel nickel cobaltite (NiCo2O4, NCO), featuring a ferrimagnetically metallic ground state with strong PMA, emerges as a promising candidate in the field of oxide spintronics. Here, we unveil multi-state electromagnetic phase modulations in the NCO system through controllable cation disorder and proton evolution, extensively expanding the electromagnetic phase diagram. The cation disorder in NCO is identified as a critical control parameter for kinetically adjusting the proton evolution, giving rise to emergent intermediate hydrogenated states. Hydrogen incorporation reversibly drives structural phase transformation and electromagnetic state evolutions in NCO, with rich spin-dependent correlated physics. Our work not only establishes NCO as a versatile platform for discovering spin-dependent physical functionality but also extends the horizons in materials design for state-of-the-art spintronic devices.
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