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12 Sep 2005

Volume 87, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 87, 113902 (2005); http://dx.doi.org/10.1063/1.2045549 (3 pages)

M. Laroussi and X. Lu
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Co-doped titanate nanotubes

Di Wu, Yanfeng Chen, Ji Liu, Xiaoning Zhao, Aidong Li, and Naiben Ming

Appl. Phys. Lett. 87, 112501 (2005); http://dx.doi.org/10.1063/1.2043254 (3 pages) | Cited 27 times

Online Publication Date: 7 September 2005

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Co-doped titanate nanotubes were synthesized through 130 °C treatment of Co-doped TiO2 powders in high concentration NaOH aqueous solutions in a hydrothermal autoclave. The obtained nanotubes were identified to be of a monoclinic layered trititanate structure, the same as H2Ti3O7, their un-doped counterpart. The incorporation of Co ions was identified by energy dispersive spectroscopy. The Ti:Co atomic ratio in the obtained nanotubes was found significantly less than the value in the powder precursor. This indicates that the precursor powders were deformed in NaOH solution before the formation of nanotubes. Magnetic measurement showed a hysteresis loop at room temperature.
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81.07.De Nanotubes
61.72.up Other materials
61.46.-w Structure of nanoscale materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Detection of single magnetic bead for biological applications using an InAs quantum-well micro-Hall sensor

Goran Mihajlović, Peng Xiong, Stephan von Molnár, Keita Ohtani, Hideo Ohno, Mark Field, and Gerard J. Sullivan

Appl. Phys. Lett. 87, 112502 (2005); http://dx.doi.org/10.1063/1.2043238 (3 pages) | Cited 33 times

Online Publication Date: 7 September 2005

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Room-temperature detection of a single commercial superparamagnetic bead (1.2 μm in diameter) suitable for biological applications has been realized using an InAs quantum-well micro-Hall sensor. The detection was demonstrated using phase-sensitive detection on a single Hall cross as well as in a Hall gradiometry setup. The high signal to noise ratio, obtained in both configurations, promises detection of single nanometer-size particles by further miniaturization of the device to submicron dimensions.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)

Thin-film ferromagnetic semiconductors based on Sb2−xVxTe3 with TC of 177 K

Zhenhua Zhou, Yi-Jiunn Chien, and Ctirad Uher

Appl. Phys. Lett. 87, 112503 (2005); http://dx.doi.org/10.1063/1.2045561 (3 pages) | Cited 12 times

Online Publication Date: 7 September 2005

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Thin-film ferromagnetic semiconductors Sb2−xVxTe3 with the Curie temperature as high as 177 K were prepared on sapphire (0001) substrates by molecular-beam epitaxy. Films of Sb2−xVxTe3 with x up to 0.35 display robust, out-of-plane ferromagnetic ordering that depends on the concentration of vanadium in the structure. The Curie temperature was determined from magnetization measurements and Arrott plots. Ferromagnetic order is manifested by hysteresis loops observed in magnetization, magnetoresistivity, and the anomalous Hall effect.
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75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
72.20.My Galvanomagnetic and other magnetotransport effects
75.50.Pp Magnetic semiconductors
75.50.Dd Nonmetallic ferromagnetic materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.47.Pq Other materials
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy

Superelasticity of CoNiGa:Fe single crystals

X. F. Dai, G. D. Liu, Z. H. Liu, G. H. Wu, J. L. Chen, F. B. Meng, H. Y. Liu, L. Q. Yan, J. P. Qu, Y. X. Li, W. G. Wang, and John Q. Xiao

Appl. Phys. Lett. 87, 112504 (2005); http://dx.doi.org/10.1063/1.2045563 (3 pages) | Cited 9 times

Online Publication Date: 8 September 2005

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We have fabricated CoNiFeGa single crystals with excellent superelasticity. The superelastic strains of 4% and 6.7% in compression have been obtained along the [001] and [110] directions, respectively. These single crystals show strong anisotropy in strains, superelastic parameters, and even transformation path related to the different crystalline directions. A large superelastic strain up to 11% has been obtained in tension test. The perfect superelasticities have also displayed in bending and torsion tests.
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81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.D- Elasticity
75.50.Cc Other ferromagnetic metals and alloys
81.40.Lm Deformation, plasticity, and creep
62.20.F- Deformation and plasticity
81.70.Bt Mechanical testing, impact tests, static and dynamic loads
81.30.Kf Martensitic transformations
64.70.K- Solid-solid transitions

Phase stability and optimum oxygenation conditions for Sr2FeMoO6 formation

A. Sharma, J. L. MacManus-Driscoll, W. Branford, Y. Bugoslavsky, L. F. Cohen, and J. Rager

Appl. Phys. Lett. 87, 112505 (2005); http://dx.doi.org/10.1063/1.2048810 (3 pages) | Cited 2 times

Online Publication Date: 8 September 2005

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The upper phase stability limit of Sr2FeMoO6 was determined in the temperature range 1140–1220 °C using coulometric titration. At 1200 °C, the decomposition oxygen partial pressure was determined to be 2.2×10−11 atm O2. Hence at 1200 °C, and for pO2’s in excess of this value, the phase is thermodynamically unstable. In order to achieve a pO2 just below the upper stability line a precise gas mixture of 2H2:1CO2 in a background carrier gas of Ar was used for the reaction atmosphere. Highly ordered samples, with high low-field magnetoresistance (LFMR) values were produced, and the very strong dependence of the LFMR on reaction time, which occurs with use of Ar/H2 gas, was eliminated.
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64.70.-p Specific phase transitions
64.60.-i General studies of phase transitions
72.20.My Galvanomagnetic and other magnetotransport effects
75.50.Gg Ferrimagnetics

Photon-spin qubit-conversion based on Overhauser shift of Zeeman energies in quantum dots

S. Muto, S. Adachi, T. Yokoi, H. Sasakura, and I. Suemune

Appl. Phys. Lett. 87, 112506 (2005); http://dx.doi.org/10.1063/1.2043229 (3 pages) | Cited 16 times

Online Publication Date: 9 September 2005

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We propose a method to realize the conversion of photon qubit and spin qubit using the effective magnetic field created by the nuclear polarization known as Overhauser field. We discuss the preliminary experiment on an InAlAs/AlGaAs self-assembled quantum dot and also discuss the effects of electron-hole interaction on the conversion.
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03.67.Hk Quantum communication
73.21.La Quantum dots
76.70.Fz Double nuclear magnetic resonance (DNMR), dynamical nuclear polarization

Reducing the critical current for short-pulse spin-transfer switching of nanomagnets

P. M. Braganca, I. N. Krivorotov, O. Ozatay, A. G. F. Garcia, N. C. Emley, J. C. Sankey, D. C. Ralph, and R. A. Buhrman

Appl. Phys. Lett. 87, 112507 (2005); http://dx.doi.org/10.1063/1.2045552 (3 pages) | Cited 37 times

Online Publication Date: 9 September 2005

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We have fabricated permalloy∕copper∕permalloy nanopillar spin valves designed to reduce the critical current for spin-transfer switching while maintaining thermal stability of the free layer. Pulsed current amplitudes necessary for switching a 4.5‐nm-thick permalloy free layer range from 0.4 mA for a 100 ns pulse to 2 mA for a 1 ns pulse, showing that the magnetization must be overdriven to achieve switching on short time scales. Comparisons to Landau–Lifshitz–Gilbert simulations indicate an effective damping parameter ≈ 0.03 and spin-torque efficiencies for parallel-to-antiparallel and antiparallel-to-parallel switching that are more symmetric than predicted by recent theoretical models.
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75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Bb Fe and its alloys
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Spin precession in a fractional quantum Hall state with spin-orbit coupling

Marco Califano, Tapash Chakraborty, and Pekka Pietiläinen

Appl. Phys. Lett. 87, 112508 (2005); http://dx.doi.org/10.1063/1.2045546 (3 pages) | Cited 2 times

Online Publication Date: 9 September 2005

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In order to investigate the fundamental question of whether inter-electron interactions are important in planar electron-based spintronics devices, we have carried out a many-body study of the spin configuration in a quantum Hall state in the presence of Bychkov-Rashba-type spin-orbit interaction. We find that the spin orientation is position dependent and can be tuned via the applied electric field. We propose that this and other properties of such a system are ideally suited for exploitation in spin devices, and that the performance can be further optimized by a careful choice of the growth orientation.
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73.43.-f Quantum Hall effects
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
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