Phys.org November 10, 2023 Researchers in China proposed a chemical means to reversibly control spin order of lactim–lactam tautomerization to reversibly modulate the magnetic phase transition in 2D organometallic lattices. They theoretically verified the proposal by designing several 2D organometallic frameworks with antiferromagnetic to ferrimagnetic spin order transformation modulated by lactim–lactam tautomerization on organic linkers. The transition originated from the change in spin states of organic linkers (from singlet to doublet) via tautomerization. Such a transition further switched materials’ electronic structures from normal semiconductors with zero spin polarization to bipolar magnetic semiconductors with valence and conduction band edges 100% spin […]
Tag Archives: Phase transitions
Nanoscale rust: The future of magnets?
Phys.org October 5, 2023 Multiferroics have tremendous potential to revolutionize logic and memory devices through new functionalities and energy efficiencies. To better understand and enhance their ferroic orders and couplings an international team of researchers (Canada, USA – Lawrence Berkeley National Laboratory, Argonne National Laboratory) used epsilon iron oxide (ϵ-Fe2O3) as a model system with a simplifying single magnetic ion. Using 15, 20, and 30 nm nanoparticles, they found that a modified and size-dependent Fe–O hybridization changed the spin–orbit coupling. However, the size effects disappeared in the high-temperature phase where the strongest Fe–O hybridization occurred. By manipulating hybridization, they could […]
From face recognition to phase recognition
Nanowerk May 31, 2018 An international team of researchers (USA – Stony Brook University, Brookhaven National Laboratory, Latvia) has developed a tool to extract “hidden” signatures of an unknown structure from measurements made by existing tools. The network training is similar to how machine learning is used in facial-recognition technology. The technique is useful for studying the dynamics of phase changes, and to monitor the arrangements of nanoparticles in catalysts and other materials… read more. TECHNICAL ARTICLE