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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Giant Magnetization Modulation of Fe in Fe/Li3PO4 Heterostructures by Space Charge
Lihao Qin1, Zihao Miao1, Jia Yan1
1College of Physics, Qingdao University, Qingdao 266071, China.
Abstract:
Ferromagnetic metals are promising candidates for voltage control of magnetism (VCM), owing to their high Curie temperatures and stable magnetic order. The space-charge effect, characterized by electron and ion separate-conducting phases, offers a particularly attractive route to modulate their magnetism via introducing a high density of spin-polarized electrons at ferromagnetic metal surfaces. In this work, Fe/Li3PO4 heterostructures are fabricated by electrochemical reduction of the commercial polyanionic battery material LiFePO4 (LFP) for space-charge-mediated magnetism modulation. Operando magnetometry reveals a remarkable change in magnetization as large as 56.6 emu gFe-1 within a low voltage window of 0.01-1.7 V, accompanied by fast response and excellent cycling stability. The dominance of the space-charge effect in the low voltage region is demonstrated by comprehensive analyses. These results stem from the advantageous properties of Li3PO4, particularly its high lithium-ion conductivity and excellent interfacial stability. Our findings highlight the unique potential of polyanionic materials for electrically tunable magnetism and offer a special avenue for designing cost-effective, high-performance tunable spintronic devices for sensing and actuation.
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