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   https://doi.org/10.1063/5.0119669  

   Ziemann, Sarah J.; Fischer, Nathan A.; Lu, Jimmy; Lee, Thomas J.; Ennis, Michael; Höft, Thomas A.; Nelson-Cheeseman, Brittany (November 2022, AIP Advances)

   Magnetic elastomers with hard or permanent magnetic particulate are able to achieve complex motion not possible from soft magnetic elastomers. Magnetic annealing and fused deposition modeling (FDM) have been used to increase the performance of magnetic composites. This research explores how the magnetoactive properties of hard magnetic elastomers are influenced by magnetic annealing and the addition of the soft magnetic particulate. Three compositions of the thermoplastic magnetic elastomer composite are explored: 15 vol. % SrFe 12 O 19 , 10 vol. % SrFe 12 O 19 /5 vol. % carbonyl iron, and 5 vol. % SrFe 12 O 19 /10 vol. % carbonyl iron. The material is then extruded into FDM filaments. During the extrusion process, some filament is magnetically annealed in an axial applied field. Magnetic hysteresis loops show that the saturation magnetization and coercivity change based on the relative amount of hard and soft magnetic particulate. The presence of only one coercive field indicates magnetic coupling between the hard and soft components. Magnetoactive testing measures each sample’s mechanical deflection angle as a function of transverse applied magnetic field strength. Qualitative and quantitative results reveal that magnetic annealing is critical to the magnetoactive performance of the hard magnetic elastomers. The results also demonstrate that magnetic annealing and increased carbonyl iron both improve the magnetoactive deflection angle for a given applied field. Scanning electron microscopy shows a stratification effect in a range of the filaments. Understanding these hard magnetic elastomers provides insight into how performance can be controlled and optimized by magnetic annealing and combining hard and soft magnetic particulate. 

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3. Probing and controlling magnetic states in 2D layered magnetic materials

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4. Interplay of magnetic field and magnetic impurities in Ising superconductors

   https://doi.org/10.1103/PhysRevB.109.174509  

   Fang, Wuzhang; Haim, M.; Belashchenko, K. D.; Khodas, M.; Mazin, I. I. (May 2024, Physical Review B)

   Phonon-driven $$s$$-wave superconductivity is fundamentally antagonistic to uniform magnetism, and field-induced suppression of the critical temperature is one of its canonical signatures. Examples of the opposite are unique and require fortuitous cancellations and very fine parameter tuning. The recently discovered Ising superconductors violate this rule: an external magnetic field applied in a certain direction does not suppress superconductivity in an ideal, impurity-free material. We propose a simple and experimentally accessible system where the effects of spin-conserving and spin-flip scattering can be studied in a controlled way, namely NbSe$$_2$$ monolayers dosed with magnetic $3d$ atoms. We predict that the critical temperature is slightly increased by an in-plane magnetic field in NbSe$$_2$$ dosed with Cr. Due to the band spin splitting, magnetic spin-flip scattering requires a finite momentum transfer, while spin-conserving scattering does not. If the magnetic anisotropy is easy-axis, an in-plane field reorients the impurity spins and transforms spin-conserving scattering into spin-flip. The critical temperature is enhanced if the induced magnetization of NbSe$$_2$$ has a substantial long-range component, as is the case for Cr ions. 

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5. Chirality and Magnetic Field

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