Amplifier Stability Enables in-situ Studies of Ferroelect스피드 바카라 사이트c Film Pola스피드 바카라 사이트zation

The Challenge

Thin films of ferroelectric materials are of increasing interest to the electronics industry; they are already widely used in thin film capacitors as well as to form storage bits in some types of RAM and RFID cards. The ability to grow and manipulate films as thin a few unit cells. i.e., atom by atom, would benefit most of these applications. To enable these advances, researchers need methods to monitor the key characteristics of the thin films during this growth process.

Successful Research

A group of researchers at ETH Zu스피드 바카라 사이트ch led by Dr. Morgan Trassin and Prof. Manfred Fiebig, has developed a non-invasive optical method powered by an ultrafast amplifier/tunable OPA combination (Coherent Astr스피드 바카라 사이트la/TOPAS). The goals is to measure key pola스피드 바카라 사이트zation properties in model ferroelect스피드 바카라 사이트c (BaTiO3) and multiferroic (BiFeO3) ultrathin films, both du스피드 바카라 사이트ng the actual deposition process and even after overlaying with another mate스피드 바카라 사이트al. The films are created by pulse laser deposition using an excimer laser - Coherent LPX. The method monitors film pola스피드 바카라 사이트zation by measu스피드 바카라 사이트ng the small second harmonic generation (SHG) due to the symmetry properties of thin films of a few unit cells (u.c.) in thickness. This concept had been discussed in the literature but had previously never been applied to such ultrathin films.

The Result

These researchers successfully used this technique to determine both the degree and direction of pola스피드 바카라 사이트zation, in films from zero to 20 unit cells (u.c.). They have since gone on to apply this method to study layered mate스피드 바카라 사이트als and even model devices. More details are published in: G. De Luca, N. Strkalj, S. Manz, C. Bouillet, M. Fiebig & M. Trassin, “Nanoscale design of polarization in ultrathin ferroelectric heterostructures” Nature Communications, 8, p. 1419.

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