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5 Jul 2010

Volume 97, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 97, 013301 (2010); http://dx.doi.org/10.1063/1.3458867 (3 pages)

M. Uno, Y. Hirose, T. Uemura, K. Takimiya, Y. Nakazawa, and J. Takeya
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Influence of tetragonal distortion on the magnetic and electronic properties of the Heusler compound Co2TiSn from first principles

Markus Meinert, Jan-Michael Schmalhorst, and Günter Reiss

Appl. Phys. Lett. 97, 012501 (2010); http://dx.doi.org/10.1063/1.3459145 (3 pages) | Cited 1 time

Online Publication Date: 6 July 2010

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Using the full potential linearized augmented plane wave plus local orbitals method we determine ab initio the lattice parameters of tetragonally distorted Co2TiSn in the L21 structure. The tetragonal lattice parameter c is determined as a function of the lattice parameter a by energy minimization. The change in total energy is found to be only a few kBT with respect to room temperature. The spin polarizations as well as the magnetizations are stable against small lattice distortions. It is shown, that the volume is not constant upon distortion and that the volume change is related with significant changes in the magnetization and the gap energy.
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72.25.Ba Spin polarized transport in metals
71.15.-m Methods of electronic structure calculations
71.15.Ap Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Cc Other ferromagnetic metals and alloys
61.50.Ah Theory of crystal structure, crystal symmetry; calculations and modeling

Direct observation of giant Barkhausen jumps in magnetic microwires

A. Chizhik, A. Stupakiewicz, A. Maziewski, A. Zhukov, J. Gonzalez, and J. M. Blanco

Appl. Phys. Lett. 97, 012502 (2010); http://dx.doi.org/10.1063/1.3460292 (3 pages) | Cited 3 times

Online Publication Date: 6 July 2010

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Magnetization reversal induced by a circular magnetic field has been studied using the magneto-optical Kerr effect in magnetic microwires. The visualization of the classical effect of a giant Barkhausen jump is reported in a magnetic microwire. It was directly confirmed that the surface giant Barkhausen jump consists of the nucleation of a single circular domain followed by the long distance quick motion of the solitary circular domain walls.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.60.Jk Magnetization reversal mechanisms
78.20.Ls Magneto-optical effects
75.70.Rf Surface magnetism
75.60.Ch Domain walls and domain structure
75.78.Fg Dynamics of domain structures

Conductance asymmetry in point-contacts on epitaxial thin films of Ba(Fe0.92Co0.08)2As2

Manan Mehta, Goutam Sheet, D. A. Dikin, S. Lee, C. W. Bark, J. Jiang, J. D. Weiss, E. E. Hellstrom, M. S. Rzchowski, C. B. Eom, and V. Chandrasekhar

Appl. Phys. Lett. 97, 012503 (2010); http://dx.doi.org/10.1063/1.3460274 (3 pages) | Cited 4 times

Online Publication Date: 7 July 2010

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One of the most common observations in point-contact spectra on the recently discovered ferropnictide superconductors is a large conductance asymmetry with respect to voltage across the point-contact. In this paper, we show that the antisymmetric part of the point-contact spectrum between a silver tip and an epitaxial thin film of Ba(Fe0.92Co0.08)2As2 shows certain unique features that have an interesting evolution with increasing temperature up to a temperature far above the critical temperature Tc. We associate this observation with the existence of a gap above Tc that might originate from strong fluctuations of the phase of the superconducting order parameter.
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74.25.fc Electric and thermal conductivity
74.70.Tx Heavy-fermion superconductors
74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions
74.78.-w Superconducting films and low-dimensional structures
74.40.-n Fluctuation phenomena
74.25.Jb Electronic structure (photoemission, etc.)

Spin-orbit coupling in double-sided doped InAs quantum well structures

Kyung-Ho Kim, Hyung-jun Kim, Hyun Cheol Koo, Joonyeon Chang, and Suk-Hee Han

Appl. Phys. Lett. 97, 012504 (2010); http://dx.doi.org/10.1063/1.3462325 (3 pages) | Cited 2 times

Online Publication Date: 8 July 2010

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We have investigated Rashba spin-orbit interaction [ Bychkov and Rashba, JETP Lett. 39, 78 (1984) ] parameter (α) in double-sided doped InAs quantum well structures of different potential asymmetries created by introducing two separated carrier supply layers. The internal potential asymmetry is manipulated between negative and positive potential gradient by adjusting the relative doping concentrations of the two carrier supply layers. The larger potential asymmetry results in the more extensive variation in α with respect to gate electric field (Vg). The structures of the negative and positive potential gradients exhibit the opposite variation in α with respect to Vg which evidently supports the fact that the sign of α can be changed by the reversed potential asymmetry.
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71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
73.21.Fg Quantum wells
81.07.St Quantum wells

Magnetostatic control of vortex chirality in Co thin film rings

Chunghee Nam, M. D. Mascaro, and C. A. Ross

Appl. Phys. Lett. 97, 012505 (2010); http://dx.doi.org/10.1063/1.3459973 (3 pages) | Cited 8 times

Online Publication Date: 9 July 2010

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The vortex chirality in an elliptical Co ring spaced 60 nm from a circular ring has been controlled by magnetostatic interaction. One of the two domain walls (DWs) in the elliptical ring interacts with a neighboring wall in the circular ring, while the other is unaffected by the stray field of the circular ring. The direction of motion of the DWs, and the chirality of the resulting vortex state in the elliptical ring, can be selected by the field direction and history.
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75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.60.Ch Domain walls and domain structure
75.75.-c Magnetic properties of nanostructures
75.50.Tt Fine-particle systems; nanocrystalline materials

Enhancement of room temperature ferromagnetism in N-doped TiO2−x rutile: Correlation with the local electronic properties

G. Drera, M. C. Mozzati, P. Galinetto, Y. Diaz-Fernandez, L. Malavasi, F. Bondino, M. Malvestuto, and L. Sangaletti

Appl. Phys. Lett. 97, 012506 (2010); http://dx.doi.org/10.1063/1.3458699 (3 pages) | Cited 12 times

Online Publication Date: 9 July 2010

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The magnetic and electronic properties of ferromagnetic undoped and N-doped TiO2−x rutile have been probed by soft x-ray spectroscopies. Upon N doping, a fivefold enhancement of the saturation magnetization is observed. Apparently, this enhancement is not related to an increase in oxygen vacancies, rather to additional in-gap states, arising from the replacement of O with N atoms in the rutile structure that can provide more favorable conditions for the onset of ferromagnetic ordering.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
79.60.Bm Clean metal, semiconductor, and insulator surfaces
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Pp Magnetic semiconductors
61.72.jd Vacancies
71.55.Ht Other nonmetals
61.72.up Other materials
71.20.Nr Semiconductor compounds

Enhanced spin accumulation obtained by inserting low-resistance MgO interface in metallic lateral spin valves

Y. Fukuma, L. Wang, H. Idzuchi, and Y. Otani

Appl. Phys. Lett. 97, 012507 (2010); http://dx.doi.org/10.1063/1.3460909 (3 pages) | Cited 13 times

Online Publication Date: 9 July 2010

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We have systematically investigated the interface contributions to the spin injection characteristics in permalloy/MgO/Ag lateral spin valves. The spin valve signal remarkably increases with MgO thickness and reaches a maximum when the interface resistance is about 100 fΩ m2 for 1 nm thick MgO, which is two orders of magnitude lower than that of the typical tunnel junction. Our quantitative analysis based on the spin-dependent diffusion equation considering variable spin polarization in the MgO layer well describes the observed trend in the spin valve signals.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
72.25.-b Spin polarized transport
73.40.Rw Metal-insulator-metal structures
66.30.Ny Chemical interdiffusion; diffusion barriers
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