Prof. Lior Klein of the Department of Physics, is Director of the Nano Magnetism Center at the Institute of Nanotechnology and Advanced Materials (BINA).
At the Itinerant Magnetism Laboratory (IML) he heads, researchers address a variety of spintronics-related topics including fundamental magneto-transport properties (anomalous Hall effect, planar Hall effect and anisotropic magneto-resistance), spin-torque effects and nanomagnetic dynamics, and physical phenomena relevant to magnetic memory and sensing devices, including tailoring of magnetic and magneto-transport properties by nanostructuring.
The issue of interaction between current and domain walls is of great importance both for basic research and applications. This is due to the fact that current-induced manipulation of domain walls is one of the most promising routes to control magnetic configurations on the nano scale, which is needed in novel spintronic devices.
Klein’s work in this area provides valuable insight to these phenomena in the extremely narrow domain walls found in SrRuO3. Research papers published by his group include a comprehensive study of the effect of domain walls on the electrical current, and a description of the effect of current on domain walls. Their research in this area continues, and currently focuses on magnetic nucleation effects and current-induced magnetic dynamics.
The planar Hall effect (PHE) is the emergence of transverse voltage in a conductor as a function of the magnitude and orientation of in-plane magnetization. Following their discovery of a giant PHE in colossal magneto-resistant manganese-based perovskites (manganites), Klein’s group is pursuing two routes.
One route focuses on resolving the intriguing observations that have contributed to the development of transport equations for crystal-symmetry effects. The other route focuses on applying this effect for the development of novel magnetic random access memory and sensitive magnetic sensors. Their current work in this area includes both basic and applied research.
On the basic research level, they are using PHE to elucidate the intriguing interplay between magnetism and electrical transport in manganites of different compositions and dopings. On the applied level, Klein’s team is attempting to develop better memory bits and magnetic sensors by fine tuning growth and nano-fabrication, developing analytical models, and using numerical simulations.
Since its recent discovery, the 2-D electron liquid that forms at the interface between the two insulating oxides SrTiO3 and LaAlO3 has attracted considerable interest due to its fascinating properties and its potential key role in future oxide-based electronics and spintronics. Klein’s group has contributed to this discovery by finding evidence for a non-uniform extraordinary Hall effect, which indicates non-uniform field-induced magnetization.
In addition, they have contributed to elucidating the angular dependence of the magneto-resistance in this system. Current efforts focus on studying the interplay between transport and magnetism in this system.