This book offers a thorough, systematic examination of two of the most typical frustrated spin systems, triangular lattice antiferromagnets and edge-shared chain magnets, and offers guidelines for finding new materials with unique magnetoelectric functions.

Electric control of magnetic properties, or inversely, magnetic control of dielectric properties in solids, is called a magnetoelectric effect and has long been investigated from the point of view of both fundamental physics and potential application. Magnetic and dielectric properties usually show minimal coupling, but it recently has been discovered that magnetically induced ferroelectricity in some spiral magnets enables remarkably large and versatile magnetoelectric responses. To stabilize such helimagnetism, magnetic frustration (competition between different magnetic interactions) is considered the key. In the present work, two of the most typical frustrated spin systemstriangular lattice antiferromagnets and edge-shared chain magnetshave systematically been investigated. Despite the crystallographic simplicity of target systems, rich magnetoelectric responses are ubiquitously observed. The current results published here offer a useful guideline in the search for new materials with unique magnetoelectric functions, and also provide an important basis for a deeper understanding of magnetoelectric phenomena in more complex systems.

Nominated by the University of Tokyo as an outstanding Ph.D thesis A systematic investigation of triangular lattice antiferromagnets and edge-shared chain magnets A guideline in the search for new multiferroic materials and a basis for deeper understanding of phenomena in complex systems Includes supplementary material: sn.pub/extras

Autorentext
Dr. Shinichiro Seki
Department of Applied Physics, University of Tokyo

Inhalt
1 Introduction.- 2 Experimental Methods.- 3 Magnetoelectric response in triangular lattice antiferromagnets.- 4 Magnetoelectric response in S=1/2 chain helimagnets.- 5 Summary.