‘Multiferroic single-phase and composite materials for room temperature magnetoelectricity’, Dr Miguel Algueró, Institutode Cienciade Materialesde Madrid (ICMM)
Date: 4 December 2019 Time: 15:00 - 16:00
Our next Materials Research Institute seminar is 'Multiferroic single-phase and composite materials for room temperature magnetoelectricity', with Miguel Algueró, Instituto de Ciencia de Materiales de Madrid (ICMM), Madrid, Spain.
The solid state linear magnetoelectric effect is the development of an electric polarization proportional to an applied magnetic field, and conversely of a magnetization in response to an electric field. Magnetoelectrics are a key enabling material technology for a range of potentially disruptive related ones, such as electrically-tunable magnetic-microwave or spintronic devices, high-sensitivity magnetic sensors with room-temperature operation, and microgenerators for wireless sensor networks or bioimplanted systems.
A main line of research is single phase multiferroics, as these compounds can show large magnetoelectric effects and coupled ferroelectric and magnetic domains. This opens the way for achieving the reversal of magnetization with an electric field and thus, for developing electrically-writable, magnetically-readable non-volatile random access memories. In this seminar, recent activity at ICMM on perovskite oxide systems, chemically engineered to be placed at instabilities of the multiferroic state for phase-change magnetoelectric response, will be briefly reviewed .
Alternatively, magnetoelectric coupling can be achieved by composite approaches. Rationale is to combine ferroelectric and ferromagnetic phases, so that magnetoelectricity is obtained from their electrostatic, magnetic or elastic interaction. The largest effective room-temperature magnetoelectric coefficients have been obtained for composites consisting of elastically-coupled high-sensitivity piezoelectric and magnetostrictive phases. At ICMM, cofired ceramic layered structures are being investigated, for they offer improved reliability in applications and are more adequate for mass production and miniaturization. Concretely, latest work concentrated on the fabrication of multilayer ceramic composites by tape casting technology, combined with spark plasma sintering, and on understanding how geometry determines functionality .
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