APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

1 Jun 2009

Volume 94, Issue 22, Articles (22xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 94, 221101 (2009); http://dx.doi.org/10.1063/1.3143652 (3 pages)

Gangyi Xu, Virginie Moreau, Yannick Chassagneux, Adel Bousseksou, Raffaele Colombelli, G. Patriarche, G. Beaudoin, and I. Sagnes
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Growth rate enhancement by nitrogen in diamond chemical vapor deposition—a catalytic effect

S. Dunst, H. Sternschulte, and M. Schreck

Appl. Phys. Lett. 94, 224101 (2009); http://dx.doi.org/10.1063/1.3143631 (3 pages) | Cited 9 times

Online Publication Date: 1 June 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The diamond growth rate enhancement factor A([N2],[CH4]) of nitrogen has been measured in situ by laser reflection interferometry using thin reflecting iridium interlayers on on-axis and off-axis single crystals. “A” shows a characteristic linear decrease with the methyl radical concentration in the gas phase. The resulting local maximum in the growth rate curve yields conditions for which growth is accelerated when the methane concentration is decreased. In a model that fits the measurements quantitatively nitrogen catalyzes growth and competes with the hydrocarbon growth species for adsorption sites. The data allow excluding of several alternative models for nitrogen induced growth rate enhancement.
Show PACS
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

Metal pumps liquid uphill

A. Y. Vorobyev and Chunlei Guo

Appl. Phys. Lett. 94, 224102 (2009); http://dx.doi.org/10.1063/1.3117237 (3 pages) | Cited 20 times

Online Publication Date: 2 June 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The behavior of liquids on a solid surface is determined by the surface wettability. In this work, by structuring metal surfaces with high-intensity femtosecond laser pulses, we engineer a unique surface pattern that dramatically modifies surface wetting properties. In a gravity-defying way, the treated metal surfaces make liquids sprint vertically uphill at an unprecedented speed of 1 cm/s. Furthermore, the surface structures we create here rapidly transport a significant amount of liquid against gravitation to an elevated point above the reservoir level, thus bringing this effect to potential real-life applications.
Show PACS
68.08.Bc Wetting
68.35.bd Metals and alloys

Microcantilever array with embedded metal oxide semiconductor field effect transistor actuators for deflection control, deflection sensing, and high frequency oscillation

Stanley S. Chou, Yun Young Kim, Arvind Srivastava, Benjamin Murphy, Oluwaseyi Balogun, Soo-Hyun Tark, Gajendra Shekhawat, and Vinayak P. Dravid

Appl. Phys. Lett. 94, 224103 (2009); http://dx.doi.org/10.1063/1.3133333 (3 pages) | Cited 1 time

Online Publication Date: 2 June 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A batch fabricated microcantilever array with embedded metal oxide semiconductor field effect transistor (MOSFET) is demonstrated to behave as an actuator as well as a strain sensor. Actuation is made possible through MOSFET self-heating effect and metal-silicon bimaterial thermal expansion mismatch. Precise cantilever deflection is achieved with gate modulated saturation current. Controllable deflection and oscillation are demonstrated, with amplitude of 212 nm measured through laser interferometry near first resonant frequency. Higher amplitude is attainable through higher bias. Such in situ actuation and sensing promises to have applications ranging from nanolithography to microfluidic mixing, among others, which require precise and controllable nanoscale deflection.
Show PACS
85.30.Tv Field effect devices
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.10.Pz Instruments for strain, force, and torque

Mössbauer studies of complex materials: Energy versus time domain

N. Planckaert, R. Callens, J. Demeter, B. Laenens, J. Meersschaut, W. Sturhahn, S. Kharlamova, K. Temst, and A. Vantomme

Appl. Phys. Lett. 94, 224104 (2009); http://dx.doi.org/10.1063/1.3147185 (3 pages) | Cited 2 times

Online Publication Date: 3 June 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We present a critical comparison between conventional Mössbauer spectroscopy on the one hand and energy and time resolved nuclear resonant scattering on the other hand. The three Mössbauer techniques are evaluated by the characterization of the complex magnetic structure of an Fe3Al alloy. It is shown how the different scattering processes and detection schemes, which are involved in the respective configurations, determine the specific strengths of the three techniques and how they are optimally suited for the characterization of materials of varying complexity and reduced sizes.
Show PACS
76.80.+y Mössbauer effect; other γ-ray spectroscopy
82.80.Ej X-ray, Mössbauer, and other γ-ray spectroscopic analysis methods
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
78.47.jd Time resolved luminescence
78.47.D- Time resolved spectroscopy (>1 psec)

Synchronized locomotion of freely suspended disjoint microbeads pairs

S. Bhat, T. P. Kurzweg, A. Guez, and G. Friedman

Appl. Phys. Lett. 94, 224105 (2009); http://dx.doi.org/10.1063/1.3132582 (3 pages)

Online Publication Date: 3 June 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The possibility of locomotion of a pair of disjoint spherical microbeads suspended in fluid is investigated experimentally. The beads interact magnetically and their nonreciprocal relative movements are coordinated using external uniform magnetic field. Locomotion is studied and demonstrated for cyclic swirling movements of the beads which mimics behavior often observed in bacterial swarms.
Show PACS
75.50.Mm Magnetic liquids
82.70.Kj Emulsions and suspensions

Phase and strain distributions associated with reactive contaminants inside of a solid oxide fuel cell

Di-Jia Liu and Jonathan Almer

Appl. Phys. Lett. 94, 224106 (2009); http://dx.doi.org/10.1063/1.3148362 (3 pages) | Cited 4 times

Online Publication Date: 4 June 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A microfocused synchrotron x-ray diffraction method was used to reveal the quantitative distributions of phase fractions, internal strains, and their interdependences at different layer depths inside of a planar solid oxide fuel cell, which was deactivated by chromium contamination through direct contact with the metallic interconnect under typical operating conditions. These observations provide insight into the mechanism of Cr poisoning. The method can serve as a versatile tool for studying the electrochemical devices with thin-layered construction such as batteries and fuel cells under static or in situ conditions.
Show PACS
82.47.Ed Solid-oxide fuel cells (SOFC)

Effect of spin frustration and spin-orbit coupling on the ferroelectric polarization in multiferroic YMnO3

Chonggui Zhong, Qing Jiang, Hua Zhang, and Xuefan Jiang

Appl. Phys. Lett. 94, 224107 (2009); http://dx.doi.org/10.1063/1.3151912 (3 pages) | Cited 5 times

Online Publication Date: 5 June 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Based on density functional theory, we investigate the mechanism of ferroelectric polarization of hexagonal YMnO3 with noncollinear magnetic structure calculations. By comparing the electronic structure of different magnetic ordering, we are surprised that, due to triangular spin frustration and spin-orbit (SO) coupling, the Y 4d states are strongly hybridized with O(3,4) 2p ones, while the hybridizations of Mn 3d with O(1,2) 2p states are reduced correspondingly. The large anomalies in Born effective charges on off-centering Y and O ions manifest that the Y d0-ness with rehybridization is the driving force for the ferroelectricity, which provides a first-principle understanding of multiferroicity in YMnO3.
Show PACS
77.22.Ej Polarization and depolarization
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
75.80.+q Magnetomechanical effects, magnetostriction
77.80.-e Ferroelectricity and antiferroelectricity
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
71.15.Mb Density functional theory, local density approximation, gradient and other corrections
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close