Author : Michael Fechner
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (838 download)
Book Synopsis Magnetoelectric Coupling at Multiferroic Interfaces by : Michael Fechner
Download or read book Magnetoelectric Coupling at Multiferroic Interfaces written by Michael Fechner and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: When magnetism and ferroelectricity coexist in the same crystalline phase of a material it is called multiferroic. Furthermore, the crystal symmetry of a multiferroic material allows for magnetoelectric coupling which is quite useful since the coupling offers magnetization switching by an external electric field or electric polarization switching by an external magnetic field. In this thesis multiferroic interfaces are examined upon the occurrence of magnetoelectric coupling. Therefore first-principle methods based on density functional theory are used. The model system that are investigated consist of different ultrathin ferromagnetic films (Co and Fe) on top of ferroelectric ATiO3 (A=Pb, Ba) perovskites. The calculations show that at the interface a moderate change of the size of the total magnetization due to a change of the electric polarization occurs. Furthermore, the magnetic order of the Fe film is sensitive to its thickness, so an unexpected ferrimagnetic ordering appears for 2ML Fe whereas for all other thicknesses ferromagnetic ordering is preferred. Hybridization and strain effects at the interface explain the observations. Finally it is shown how the magnetic instability can be used to gain control of the magnetic ordering by the electric polarization.