Printing Air-Stable High-T_cMolecular Magnet with Tunable Magnetic Interaction

Abstract

High-T c molecular magnets have amassed much promise; however, the long-standing obstacle for its practical applications is the inaccessibility of high-temperature molecular magnets showing dynamic and nonvolatile magnetization control. In addition, its functional durability is prone to degradation in oxygen and heat. Here, we introduce a rapid prototyping and stabilizing strategy for high T c (360 K) molecular magnets with precise spatial control in geometry. The printed molecular magnets are thermally stable up to 400 K and air-stable for over 300 days, a significant improvement in its lifetime and durability. X-ray magnetic circular dichroism and computational modeling reveal the water ligands controlling magnetic exchange interaction of molecular magnets. The molecular magnets also show dynamical and reversible tunability of magnetic exchange interactions, enabling a colossal working temperature window of 86 K (from 258 to 344 K). This study provides a pathway to flexible, lightweight, and durable molecular magnetic devices through additive manufacturing.

Dimensional Transformation of Molecular Magnetic Materials

“…The magnetization is reduced after cation exchange that could be ascribed to the low dimensionality of the spin coupling network. The magnetic hysteresis (MH) loops of VCMF-PBA confirm its room-temperature magnetism, with a pronounced difference from VC-PBA. , The MH loop of 2D VCMF-PBA presents the emerged magnetic anisotropy due to the reduced dimensionality of the 2D plates (Figures c and S12), while the features of high-temperature magnetic ordering remain (Figures S13 and S14). Besides, the crystalline V–Cr coordination framework in the VCMF-PBA plates is established, and it shows the intrinsic magnetic anisotropy due to the combined spin configuration of Mn–NC–Fe and V–NC–Cr in one crystal (Figure d).…”

Magnetoelectric interaction in molecular multiferroic nanocomposites

“…The achieved substance with a dark blue color is dried for one day in a vacuum chamber at room temperature. 7,22 The product is a dark blue powder of PB nanocrystals. Since the PB powder is sensitive to oxidation, it is necessary to be kept in the glove box.…”

Lithiating magneto-ionics in a rechargeable battery

“…Recent years have witnessed a shift toward responsive molecular hybrid materials due to their lightweight character, synthetic versatility, structural vacancy, and low Gilbert damping ( 5 – 11 ). The structural vacancy of such a porous network could induce mass transfer (such as proton and alkali metal ions), promising magneto-ionic control of its magnetism ( 12 – 17 ) and gaining attention as the electrode material in Li-ion batteries. The structural vacancy networks, serving as the ion migration channels, enable a high ionic conductivity ( Fig.…”