42 citations · 87 across the 12 of their papers we have counts for
10 papers · 1 filter
Photoresist-Free Lithography via Light-Induced Redox Patterning of Oxide Thin Films
Johannes Frantti, Yukari Fujioka, Christopher Rouleau +2
Lithographic patterning of nanoscale devices typically depends on photoresists, wet processing and multistep pattern-transfer workflows that impose both environmental and scaling c…
Room-temperature insulating ferromagnetic (Ni,Co)1+2xTi1-xO3 thin films
Yukari Fujioka, Johannes Frantti, Christopher Rouleau +6
Insulating uniaxial room-temperature ferromagnets are a prerequisite for commonplace spin wave-based devices, the obstacle in contemporary ferromagnets being the coupling of ferrom…
In Quest of a Ferromagnetic Insulator -- Structure Controlled Magnetism in Mg-Ti-O Thin Films
Johannes Frantti, Yukari Fujioka, Christopher Rouleau +5
Ferromagnetic insulator thin films can convey information by spin waves, avoiding charge displacement and Eddy current losses. The sparsity of high-temperature insulating ferromagn…
Nickel-cobalt-titanate thin films - new sustainable magnetic oxides
Yukari Fujioka, Johannes Frantti, Christopher Rouleau +2
Single phase nickel-cobalt-titanate thin films with a formula A1+2xTi1-xO3, where A is Ni2+,Co2+ and -0.25<x<1, were grown by pulsed laser deposition on sapphire substrates. There…
Phase transitions and thermal-stress-induced structural changes in a ferroelectric Pb(Zr0.80Ti0.20)O3 single crystal
J. Frantti, Y. Fujioka, A. Puretzky +4
A single crystal of lead-zirconate-titanate (PZT), composition Pb(Zr0.80Ti0.20)O3, was studied by polarized-Raman scattering as a function of temperature. Raman spectra reveal that…
Triclinic Ni0.6Co0.4TiO3 Ilmenite Oxide
Yukari Fujioka, Johannes Frantti, Anna Llobet +2
Forming a solid-solution of NiTiO3 and CoTiO3, two isostructural (ilmenite) and isosymmetrical (space group R-3) compounds, result in a single-phase compound with a remarkably low…
A statistical model approximation for perovskite solid-solutions: a Raman study of lead-zirconate-titanate single crystal
J. Frantti, Y. Fujioka, A. Puretzky +3
Lead titanate (PbTiO3) is a classical example of a ferroelectric perovskite oxide illustrating a displacive phase transition accompanied by a softening of a symmetry-breaking mode.…
High-pressure neutron study of the morphotropic PZT: phase transitions in a two-phase system
J. Frantti, Y. Fujioka, J. Zhang +6
In piezoelectric ceramics the changes in the phase stabilities versus stress and temperature in the vicinity of the phase boundary play a central role. The present study was dedica…
Pressure induced phase transitions in PbTiO - a query for the polarization rotation theory
J. Frantti, Y. Fujioka, R. M. Nieminen
Our first-principles computations show that the ground state of PbTiO under hydrostatic pressure transforms discontinuously from to at 9 GPa. Spontaneous polarizat…
Can buckling account for the features seen in graphite's Raman spectra?
Y. Fujioka, J. Frantti, E. Yasuda +2
Raman scattering data were collected on graphite monochromator. Spectra were interpreted in terms of the space group , a subgroup of space group . The latter has…