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1. Magnetism of penta-coordinate Co(II) complexes with field-induced single-molecule magnet properties. Effects of distortion from C_2v symmetry

   https://doi.org/10.1039/D6DT02200F  

   Hand, Adam T; Fakolujo, Adiat A; Jenkins, Michael J; Sanders, Brandon D; Chen, Lei; Wang, Zhenxing; Cheng, Yongqiang; Ozerov, Mykhaylo; Daemenc, Luke; Gai, Zheng; et al (September 2026, Dalton Transactions)

   Molecular magnetic materials, especially those showing single-molecule magnet (SMM) behaviors, have potential applications in, e.g., spintronics and high-density information storage. Penta-coordination in high-spin Co^IIcomplexes leads to magnetic anisotropy and... 

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2. A new layered kagome strip structure Na ₂ Co ₃ (AsO ₄ ) ₂ (OH) ₂ : static and dynamic magnetic properties

   https://doi.org/10.1039/D5QM00922G  

   Liurukara, Duminda S; Williams, Emily D; Chen, Tianran; Calder, Stuart; Garlea, V Ovidiu; Buchanan, C Charlotte; Gilbert, Dustin A; Kolis, Joseph W; Tennant, D A (March 2026, Materials Chemistry Frontiers)

   The frustrated kagome strip quantum spin system exhibits a wide range of quantum ground states because of quantum fluctuations. Na₂Co₃(AsO₄)₂(OH)₂belongs to this class of magnetic materials with a broad spectrum of magnetic properties. 

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3. Composition-Driven Control of Magnetic Anisotropy in Hybrid Organic–Inorganic Metal Halides

   https://doi.org/10.1021/acsami.6c09056  

   Chakraborty, Nilave; Thapa, Puja; Jensen, Jacob Kjeldahl; Sun, Dali; Whittaker-Brooks, Luisa (July 2026, ACS Applied Materials & Interfaces)

   Two-dimensional (2D) magnetic materials provide a fertile platform for exploring low-dimensional magnetism and anisotropy-driven magnetic ordering, yet achieving continuous and controllable tuning of magnetic anisotropy remains a significant challenge. Here, we report a systematic chemical strategy to modulate magnetic anisotropy in a family of quasi-2D-layered hybrid organic–inorganic perovskites, (PEA)2Mn1–xCuxCl4 (0 ≤ x ≤ 1). Single crystals spanning the full compositional range were grown via a slow evaporation method, yielding phase-pure materials that exhibit continuous solid-solution behavior without phase segregation. Structural characterization confirms a common layered framework across all compositions, with gradual lattice evolution upon Mn2+/Cu2+ substitution. Comprehensive DC and AC magnetization measurements performed along orthogonal crystallographic directions reveal a progressive transformation of the magnetic ground state from Ising-type antiferromagnetism in (PEA)2MnCl4 to XY-type ferromagnetism in (PEA)2CuCl4. Intermediate compositions display coexistence of antiferromagnetic and ferromagnetic interactions, accompanied by a continuous crossover from easy-axis to easy-plane magnetic anisotropy. Field-dependent measurements further demonstrate a coherent evolution of spin-flop behavior, hysteresis, and saturation magnetization across the series. These results establish chemical substitution as an effective and versatile route for engineering magnetic anisotropy in hybrid perovskites, positioning transition-metal-based 2D HOIPs as a chemically programmable platform for tunable low-dimensional magnetism and future spintronic applications. 

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4. Magnetization–structure–composition phase diagram mapping in Co-Fe-Ni alloys using diffusion multiples and scanning Hall probe microscopy

   https://doi.org/10.1038/s41598-022-05121-1  

   Shamsutdinov, Girfan; Zhao, Peng; Bhattiprolu, Sreenivas; Zhao, Ji-Cheng; Nadgorny, Boris (December 2022, Scientific Reports)

   Abstract Transition metal alloys are essential for magnetic recording, memory, and new materials-by-design applications. Saturation magnetization in these alloys have previously been measured by conventional techniques, for a limited number of samples with discrete compositions, a laborious and time-consuming effort. Here, we propose a method to construct complete saturation magnetization diagrams for Co–Fe–Ni alloys using scanning Hall probe microscopy (SHPM). A composition gradient was created by the diffusion multiple technique, generating a full combinatorial materials library with an identical thermal history. The composition and crystallographic phases of the alloys were identified by integrated energy dispersive X-ray spectroscopy and electron backscatter diffraction. “Pixel-by-pixel” perpendicular components of the magnetic field were converted into maps of saturation magnetization using the inversion matrix technique. The saturation magnetization dependence for the binary alloys was consistent with the Slater-Pauling behavior. By using a significantly denser data point distribution than previously available, the maximum of the Slater-Pauling curve for the Co–Fe alloys was identified at ~ 32 at% of Co. By mapping the entire ternary diagram of Co–Fe–Ni alloys recorded in a single experiment, we have demonstrated that SHPM—in concert with the combinatorial approach—is a powerful high-throughput characterization tool, providing an effective metrology platform to advance the search for new magnetic materials. 

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5. A mathematical model for thermal radiation between non-continuous periodic structures and its application in near-field radiation between split ring resonators

   https://doi.org/10.1088/1361-6463/adb3b6  

   Wen, Sy-Bor; Khazaee, Saeed (February 2025, Journal of Physics D: Applied Physics)

   Abstract A mathematical model has been developed to study far-field and near-field thermal emission from non-continuous periodic structures. Non-continuous periodic structures with appropriate geometries and materials can support electric or magnetic resonance, idealized for designing far-field perfect absorbers and near-field emitters/absorbers supporting long-distance photon tunneling. However, these structures do not have close format dyadic Green’s function to describe the thermal radiation from randomly fluctuating thermal current. Thus, simulating the near-field radiation spectrum between emitters and collectors patterned with these non-continuous periodic structures is challenging. Though finding eigenmodes of white-noise-like fluctuating thermal current satisfying this specific geometry, we extended the Wiener-Chaotic expansion type of near-field simulation to study far-field and near-field thermal emission from non-continuous periodic structures. After verifications with reference cases, the new mathematical method is applied to study photon tunneling between the emitter and the collector patterned with single-ring split ring resonance rings (SRR) supporting magnetic field resonance. It is observed from the new mathematical model that long photon tunneling can occur under such a configuration through magnetic field coupling between the emitter and collector at the magnetic resonance frequency of SRRs. 

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