Epitaxial growth of multiferroic YMnO3 on GaN

Direct Observation of Multiferroic Vortex Domains in YMnO3

Topological vortices with swirling ferroelectric, magnetic and structural anti-phase relationship in hexagonal RMnO3 (R = Ho to Lu, Y, and Sc) have attracted much attention because of their intriguing behaviors. Herein, we report the structure of multiferroic vortex domains in YMnO3 at atomic scale using state-of-the-art aberration-corrected scanning transmission electron microscopy (STEM). Two...

Structural coherence and ferroelectric order in nanosized multiferroic YMnO3

S. Tripathi,1 V. Petkov,1,* S. M. Selbach,2 K. Bergum,2 M.-A. Einarsrud,2 T. Grande,2 and Y. Ren3 1Department of Physics, Central Michigan University, Mt. Pleasant, Michigan 48859, USA 2Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway 3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA (Receive...

GaN Nanorods and Nanotubes 35 Epitaxial Growth of ZnO-GaN Hetero-Nanorods and GaN Nanotubes

Various methods to grow high quality and perfectly arranged ZnO nanorods have been reported over the recent years (see, e.g., [1, 2] and references therein). However, due to the material properties of ZnO and its related compounds, there are many restrictions in designing more complex heterostructures or even devices based on such nanorods. In particular p-type doping of ZnO is still a big, yet...

Lowtemperature epitaxial growth and photoluminescence characterization of GaN

Pulsed selective epitaxial growth of hexagonal GaN microprisms

Hexagonal GaN microprism structures were fabricated by pulsed selective epitaxial growth (SEG) under conditions that suppressed lateral overgrowth. Unlike previously reported pulsed SEG processes in which the precursor gas flow was modulated by valves, the approach reported here utilizes a flow geometry that produces a significant deposition rate only over the downstream portion of the 2 in waf...