Local-structure origins of the sustained Curie temperature in (Ba,Ca)TiO₃ ferroelectrics

Igor Levin, Victor Krayzman, and Joseph C. Woicik

While the lattice volume in the solid-solution Ba_1−xCaxTiO₃ decreases with increasing x, the Curie temperature remains unaffected, in contrast to Ba_1−xSrxTiO₃. We have determined the origin of this phenomenon by comparing the local structures in (Ba,Ca)TiO₃ and (Ba,Sr)TiO₃.

Appl. Phys. Lett. 102, 162906 (2013) | HTML | PDF

Tunable giant magnetic anisotropy in amorphous SmCo thin films

F. Magnus, R. Moubah, A. H. Roos, A. Kruk, V. Kapaklis, T. Hase, B. Hjörvarsson, and G. Andersson

SmCo thin films have been grown by magnetron sputtering at room temperature with a composition of 2–35 at. % Sm. Films with 5 at. % or higher Sm are amorphous and smooth

Appl. Phys. Lett. 102, 162402 (2013) | HTML | PDF

Improving the intrinsic cut-off frequency of gate-all-around quantum-wire transistors without channel length scaling

A. Benali, F. L. Traversa, G. Albareda, M. Aghoutane, and X. Oriols

Progress in high-frequency transistors is based on reducing electron transit time, either by scaling their lengths or by introducing materials with higher electron mobility. For gate-all-around quantum-wire transistors with lateral dimensions similar or smaller than their length, a careful analysis of the displacement current reveals that a time shorter than the transit time controls their high-frequency performance.

Appl. Phys. Lett. 102, 173506 (2013) | HTML | PDF

Dexterous manipulation of microparticles using Bessel-function acoustic pressure fields

Charles R. P. Courtney, Bruce W. Drinkwater, Christine E. M. Demore, Sandy Cochran, Alon Grinenko, and Paul D. Wilcox

The authors show that Bessel-function acoustic pressure fields can be used to trap and controllably position microparticles. A circular, 16-element ultrasound array generates and manipulates an acoustic field within a chamber, trapping microparticles and agglomerates.

Appl. Phys. Lett. 102, 123508 (2013) | HTML | PDF

Tuning magnetic anisotropy in (001) oriented L1₀ (Fe_1−xCux)₅₅Pt₄₅ films

Dustin A. Gilbert, Liang-Wei Wang, Timothy J. Klemmer, Jan-Ulrich Thiele, Chih-Huang Lai, and Kai Liu

The authors have achieved (001) oriented L10 (Fe_1−xCu_x)₅₅Pt₄₅ thin films, with magnetic anisotropy up to 3.6 × 10⁷ erg/cm³, using atomic-scale multilayer sputtering and post annealing at 400 °C for 10 s. By fixing the Pt concentration, structure and magnetic properties are systematically tuned by the Cu addition.

Appl. Phys. Lett. 102, 132406 (2013) | HTML | PDF