Multifunktionella magnetiska material
Tidsperiod: 2016-01-01 till 2019-12-31
Projektledare: Roland Mathieu
Budget: 3 080 000 SEK
Certain transition metal oxides – strongly correlated electron systems – exhibit magnetic and electric order as well as coupling between these coexisting states. This project aims at developing materials or material combinations with tailored magnetic and electrical properties, such as simultaneous and coupled ferromagnetic and ferroelectric ordering with ordering temperatures above room temperature. Such matter will constitute (multi)functional materials with expected applicability in e.g. emerging nanoelectronics. There are many results of fundamental and technological importance to be expected from the project. For example the fundamental mechanisms reponsible for functionalities of strongly correlated systems such as magnetoresistance, electroresistance or magneto(di)electric effects are not completely known. In this project we shall extract information on the mechanisms responsible for the observed functionalities; leading to know how that will allow tailoring of novel materials and nanocomposites with controlled and applicable (multi)functional properties.For example, owing to the coupling of magnetic and electronic polarization, the high or low resistance state of a magnetoelectric device can be switched using only an electric field (switching the electronic polarization) or voltage, i.e. without the need of a magnetic field, which is more complicated to generate, as in traditional GMR devices. Considering the ever growing number of electronic devices, computers and gadgets, it is a greatly important challenge to design new materials allowing us to fabricate devices which will consume less energy for same or superior performance. Materials will be designed, synthesized, and characterized experimentally, hand in hand with theoretical predictions and modeling. Experiments involve synthesis of bulk (ceramics, single-crystals) and nanosized (nanoparticles, nanocomposites) oxides, and investigation of structural, magnetic and (di)electrical properties. Macroscopic measurements will be completed by diffraction and spectroscopy techniques to gain e.g. information on the microscopic magnetic structure and cation arrangements. Theoretical predictions and calculations will be performed within the framework of density functional theory.The core research team includes local co-workers and close collaborators such as Prof. Sergey Ivanov and Prof. D. D. Sarma, both Guest Professors at Uppsala University, Dr. Davide Peddis, main supervisor of guest Ph.D. student of the applicant, and co-applicant Dr. Diana Iusan and colleagues from Materials theory, Uppsala University, with proven expertise in experimental and theoretical crystallochemical design of transition metal oxides and nanosystems.