Large-scale multiferroic complex oxide epitaxy with magnetically switched polarization enabled by solution processing

Complex oxides with tunable structures have many fascinating properties, though high-quality complex oxide epitaxy with precisely controlled composition is still out of reach. Here we have successfully developed solution-based single-crystalline epitaxy for multiferroic (1-x)BiTi_(1-y)/2Fe_yMg_(1-y)/2O₃–(x)CaTiO₃ (BTFM–CTO) solid solution in large area, confirming its ferroelectricity at the atomic scale with strong spontaneous polarization. Careful compositional tuning leads to a bulk magnetization of 0.07 ± 0.035 μ_B/Fe at room temperature, enabling magnetically induced polarization switching exhibiting a large magnetoelectric coefficient of 2.7–3.0 × 10⁻⁷ s/m. This work demonstrates the great potential of solution processing in large-scale complex oxide epitaxy and establishes novel room-temperature magnetoelectric coupling in epitaxial BTFM–CTO film, making it possible to explore a much wider space of composition, phase, and structure that can be easily scaled up for industrial applications.     

The experience of becoming a legal professional

Students intent on a career as a legal professional prepare for this through university study. The research reported in this paper looks at the clear relationships described by law students between the focus of their university study and their perceptions of the nature of work as a legal professional. We suggest that the current approach to teaching students of law requires some change to enable students to develop holistic approaches to learning in conjunction with a broadened perception of their future work.     

Effects of High and Low Prior Knowledge on Construction of a Joint Problem Space

The participants were 4th-year medical students designing a clinical trial to test a new hypothetical anticancer drug. They worked with the computer simulation the Oncology Thinking Cap in facilitated groups that differed in terms of their prior knowledge. Both groups engaged in constructive activity and reached similar endpoints. The groups differed qualitatively in how they went about constructing and navigating the joint problem space. The high-prior-knowledge group used their knowledge to help them construct plans, evaluate their actions, and stay focused on the goals of the experimental design task. The low-prior-knowledge group searched through the data exhaustively and used them to generate their plans. They were unsystematic in their planning and interpretation. They used the computer representations in their reasoning and worked at mapping the connections between the representations. The computer scaffolding played an important role for both groups, but the facilitator played a greater role in the low-prior-knowledge group.     

Review：Recent advances in nonlinear control technologies for shape memory alloy actuators

This paper reviews recent developments in nonlinear control technologies for shape memory alloy (SMA) actuators in robotics and their related applications. SMA possesses large hysteresis, low bandwidth, slow response, and non-linear behavior, which make them difficult to control. The fast response of the SMA actuator mostly depends upon, (1) type of controller, (2) rate of addition and removal of heat, and (3) shape or form of the actuator. Though linear controllers are more desirable than nonlinear ones, the review of literature shows that the results obtained using nonlinear controllers were far better than the former one. Therefore, more emphasis is made on the nonlinear control technologies taking into account the intelligent controllers. Various forms of SMA actuator along with different heating and cooling methods are presented in this review, followed by the nonlinear control methods and the control problems encountered by the researchers.     

T R Govindachari’s natural products chemistry

Prof. Govindachari’s research career, which spanned more than five decades, was almost completely devoted to the chemistry of Indian plants wherein he made seminal contributions. His work was notable for two major reasons: Firstly, it focused on the isolation and structure elucidation of plant constituents, occasionally supported by total or partial synthesis. Secondly his interests were copiously distributed among different classes, alkaloids, terpenes, oxygen heterocycles and other systems. It is impossible to do full justice to his work and this article provides only a selection which will give a flavor of his contributions.